Journal articles: 'Turbine fluid-structure'

1

Song, Ke, and Yuchi Kang. "Fluid-Structure Interactions Analysis of a Drag-Type Horizontal Axis Hydraulic Turbine." Journal of Physics: Conference Series 2404, no. 1 (December 1, 2022): 012001. http://dx.doi.org/10.1088/1742-6596/2404/1/012001.

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Abstract The Fluid-structure interaction characteristics on the two drag-type horizontal axis hydraulic turbinesare investigated. The results show that the two drag-type horizontal axis hydraulic turbines are suitable for operation under low flow rate and low TSR conditions. The Tuebine 2 has a higher CP value from TSR=0.5 to TSR=2.0, and has a lower CT value in the whole TSR rangethan the Turbine 1. The maximum stresses are at the blade root area, and the maximum deformations are at the blade tip for both turbines. The Turbine 1 has a higher stress level and total deformation than the Turbine 2. The frequency on 1st, 2nd, 3rd, 4th and 5th order vibration modes of the Turbine 1 is higher than the Turbine 2, and the 6th one is not. The results provide a reference for the drag-type horizontal-axis hydraulic turbines.

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Patel, Yogesh Ramesh. "FSI in Wind Turbines: A Review." International Journal of Recent Contributions from Engineering, Science & IT (iJES) 8, no. 3 (September 30, 2020): 37. http://dx.doi.org/10.3991/ijes.v8i3.16595.

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This paper provides a brief overview of the research in the field of Fluid-structure interaction in Wind Turbines. Fluid-Structure Interaction (FSI) is the interplay of some movable or deformable structure with an internal or surrounding fluid flow. Flow brought about vibrations of two airfoils used in wind turbine blades are investigated by using a strong coupled fluid shape interplay approach. The approach is based totally on a regularly occurring Computational Fluid Dynamics (CFD) code that solves the Navier-Stokes equations defined in Arbitrary Lagrangian-Eulerian (ALE) coordinates by way of a finite extent method. The need for the FSI in the wind Turbine system is studied and comprehensively presented.

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Lin, Dong Long, Zhao Pang, Ke Xin Zhang, and Shuang You. "Fluid-Structure Interaction Simulation of Wind Turbine." Applied Mechanics and Materials 678 (October 2014): 556–60. http://dx.doi.org/10.4028/www.scientific.net/amm.678.556.

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The model of wind turbine was created by CATIA software, and then the simulation for blades and wind field was conducted by ANSYS software. The phenomena, such as tip vortex of blade, center vortex, and spiral trailing edge vortex caused by the rotating wind turbine, were presented explicitly and the pressure distribution of wind field was obtained. This paper provides some guiding significance to the arrangement of wind turbine and the studies about loading, deformation, and stress of blades.

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Gong, Ru-Zhi, Hong-Jie Wang, Jun-Long Zhao, De-You Li, and Xian-Zhu Wei. "Influence of clearance parameters on the rotor dynamic character of hydraulic turbine shaft system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 2 (April 9, 2013): 262–70. http://dx.doi.org/10.1177/0954406213484875.

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The study of rotor dynamic stability of hydraulic turbine system has become extremely important because of the increasing capacity, size, and inertia of large turbines. Crown clearance and band clearance in hydraulic turbines will influence the rotor dynamic characters of turbine shaft system. In this article, the character of the turbine shaft system under different clearance parameters is studied in order to observe how the clearance parameters influence the stability of hydraulic turbine. The relationship between the hydraulic turbine stability system and the turbine clearance structure is also analyzed. In this study, the force on the turbine rotor induced by fluid flow in clearances is described with the analytical solution of Reynolds equation obtained in the article, in which the fluid flow is considered to be incompressible and isothermal. And, the rotor dynamic character of the turbine system is calculated by NewMark direct integral method and non-linear forces obtained from Reynolds equation are implemented. Finally, principles related to the clearance parameters influencing the rotor dynamic character of turbine system are summarized.

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Zhang, Yuquan, Zhiqiang Liu, Chengyi Li, Xuemei Wang, Yuan Zheng, Zhi Zhang, Emmanuel Fernandez-Rodriguez, and Rabea Jamil Mahfoud. "Fluid–Structure Interaction Modeling of Structural Loads and Fatigue Life Analysis of Tidal Stream Turbine." Mathematics 10, no. 19 (October 7, 2022): 3674. http://dx.doi.org/10.3390/math10193674.

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Developing reliable tidal-energy turbines of a large size and capacity links to preservation of the structural safety and stability of the blades. In this study, a bidirectional fluid–structure coupling method was applied to analyze the hydrodynamic performance and structural characteristics of the blade of a tidal-stream turbine. Analyses were conducted on the transient and stable structural stresses, fatigue, and deformations under the influence of water depth and turbine rotational speed. The performance predictions with and without fluid–structure coupling are similar to measurements. The water-depth change has little effect on the stress and deformation change of the blade, while the turbine-speed change has the most significant effect on it. When the turbine just starts, the blade will be subject to a sudden change load. This is due to the increase in turbine speed, resulting in the sudden load. Similar to the trend of blade stress, the blade safety factor is lower near the root of the blade, and the turbine-speed change has a more significant impact on the blade structure’s safety. However, the number of stress cycles in the blade at different rotational speeds is within the safety range.

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Guerri, Ouahiba, Aziz Hamdouni, and Anas Sakout. "Fluid Structure Interaction of Wind Turbine Airfoils." Wind Engineering 32, no. 6 (December 2008): 539–57. http://dx.doi.org/10.1260/030952408787548875.

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Moraga, G., C. Valero, D. Valentín, M. Egusquiza, X. Xia, L. Zhou, and A. Presas. "Characterization of the Fluid Damping in Simplified Models of Pump-Turbines and High Head Francis Runners." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (September 1, 2022): 012091. http://dx.doi.org/10.1088/1755-1315/1079/1/012091.

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Abstract In order to satisfy the power demand in the electrical grid, hydraulic turbine units frequently work under off-design operation conditions and pass through transient events. These operation conditions can lead to high vibration amplitudes in the turbine runners, decreasing their useful life, and in some cases to premature failures. To determine and to understand the behaviour of the fluid damping is a relevant topic, because this parameter limits the maximum amplitude in resonance conditions. The runner of some types of turbines, such as reversible pump-turbine and high head Francis turbine, can be modelled as a disk-like structure, due to their similar mode shapes. Because of this, in this work, the fluid damping of a vibrating disk was studied. The disk was submerged in water and was put in a resonant state at different vibration amplitudes. Moreover, this structure was excited at different distances to a rigid surface, in order to analyse the effects of the distance between the runner and the casing. The main effects on the fluid damping were determined and characterized, showing a dependency of the fluid damping ratio on the different parameters.

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Cheng, Tai Hong, and Il Kwon Oh. "Fluid-Structure Coupled Analyses of Composite Wind Turbine Blades." Advanced Materials Research 26-28 (October 2007): 41–44. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.41.

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The composite rotor blades have been widely used as an important part of the wind power generation systems because the strength, stiffness, durability and vibration of composite materials are all excellent. In composite laminated blades, the static and dynamic aeroelasticity tailoring can be performed by controlling laminate angle or stacking sequence. In this paper, the fluid-structure coupled analyses of 10kW wind turbine blades has been performed by means of the full coupling between CFD and CSD based finite element methods. Fiber enforced composites fabricated with three types of stacking sequences were also studied. First the centrifugal force was considered for the nonlinear static analyses of the wind turbine so as to predict the deformation of tip point in the length direction and maximum stress in the root of a wind turbine. And then, the aeroelastic static deformation was taken into account with fluid-structure interaction analysis of the wind turbine. The Arbitrary Lagrangian Eulerian Coordinate was used to compute fluid structure interaction analysis of the wind turbine by using ADINA program. The displacement and stress increased apparently with the increment of aerodynamic force, but under the condition of maximum rotation speed 140RPM of the wind turbine, the displacement and stress were in the range of safety.

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Shkara, Yasir, Martin Cardaun, Ralf Schelenz, and Georg Jacobs. "Aeroelastic response of a multi-megawatt upwind horizontal axis wind turbine (HAWT) based on fluid–structure interaction simulation." Wind Energy Science 5, no. 1 (January 28, 2020): 141–54. http://dx.doi.org/10.5194/wes-5-141-2020.

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Abstract. With the increasing demand for greener, sustainable, and economical energy sources, wind energy has proven to be a potential sustainable source of energy. The trend development of wind turbines tends to increase rotor diameter and tower height to capture more energy. The bigger, lighter, and more flexible structure is more sensitive to smaller excitations. To make sure that the dynamic behavior of the wind turbine structure will not influence the stability of the system and to further optimize the structure, a fully detailed analysis of the entire wind turbine structure is crucial. Since the fatigue and the excitation of the structure are highly depending on the aerodynamic forces, it is important to take blade–tower interactions into consideration in the design of large-scale wind turbines. In this work, an aeroelastic model that describes the interaction between the blade and the tower of a horizontal axis wind turbine (HAWT) is presented. The high-fidelity fluid–structure interaction (FSI) model is developed by coupling a computational fluid dynamics (CFD) solver with a finite element (FE) solver to investigate the response of a multi-megawatt wind turbine structure. The results of the computational simulation showed that the dynamic response of the tower is highly dependent on the rotor azimuthal position. Furthermore, rotation of the blades in front of the tower causes not only aerodynamic forces on the blades but also a sudden reduction in the rotor aerodynamic torque by 2.3 % three times per revolution.

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Lipian, Michal, Pawel Czapski, and Damian Obidowski. "Fluid–Structure Interaction Numerical Analysis of a Small, Urban Wind Turbine Blade." Energies 13, no. 7 (April 10, 2020): 1832. http://dx.doi.org/10.3390/en13071832.

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While the vast majority of the wind energy market is dominated by megawatt-size wind turbines, the increasing importance of distributed electricity generation gives way to small, personal-size installations. Due to their situation at relatively low heights and above-ground levels, they are forced to operate in a low energy-density environment, hence the important role of rotor optimization and flow studies. In addition, the small wind turbine operation close to human habitats emphasizes the need to ensure the maximum reliability of the system. The present article summarizes a case study of a small wind turbine (rated power 350 W @ 8.4 m/s) from the point of view of aerodynamic performance (efficiency, flow around blades). The structural strength analysis of the blades milled for the prototype was performed in the form of a one-way Fluid–Structure Interaction (FSI). Blade deformations and stresses were examined, showing that only minor deformations may be expected, with no significant influence on rotor aerodynamics. The study of an unorthodox material (PA66 MO polyamide) and application of FSI to examine both structural strength and blade deformation under different operating conditions are an approach rarely employed in small wind turbine design.

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Langidis, A., S. Nietiedt, F. Berger, L. Kröger, V. Petrović, T. T. B. Wester, G. Gülker, et al. "Design and evaluation of rotor blades for fluid structure interaction studies in wind tunnel conditions." Journal of Physics: Conference Series 2265, no. 2 (May 1, 2022): 022079. http://dx.doi.org/10.1088/1742-6596/2265/2/022079.

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Abstract Wind tunnel experiments with wind turbine models are a promising method for investigating fluid structure interaction (FSI) phenomena. However, the lack of suitable models that feature properly scaled blades and the complexity of aeroelastic and fluid dynamic measurements during turbine operation is challenging. In this paper, the design methodology for aeroelastically scaled blades which are intended for Model Wind Turbine Oldenburg (MoWiTO) 1.8 is presented. The scaling relations are formulated, initiating from the existing turbines’ design. Next, the manufactured blades are equipped on MoWiTO and are subsequently evaluated, during operation under gusty wind fields produced by an active grid. The tip deflection is recorded using an innovative photogrammetry setup. Simulations of an OpenFAST model, which has properties extracted from the scaling formulation, are used as reference. The recorded loads and blade deformations show similar dynamics, compared to the reference. These results prove the design successful, and the capability of measuring FSI phenomena in wind tunnel environment is showcased.

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12

Yang, Mengqi, Xingxing Huang, Qilian He, Huili Bi, Dongyang Hu, Dejiang Hu, and Zhengwei Wang. "Fluid-Structure Coupling Analysis of a Pump-turbine unit during the Pump Shutdown Transient Process." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (September 1, 2022): 012038. http://dx.doi.org/10.1088/1755-1315/1079/1/012038.

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Abstract Hydropower is a major renewable clean energy and is widely used worldwide. The reversible pump-turbine unit of the pumped-storage power station is able to work in two main operating modes as required by the power grid: turbine-mode for power generation and pump-mode for power storage. In order to absorb unstable energies such as wind and solar energy and improve the quality of the electricity, reversible pump-turbines need to frequently change operating conditions, and experience more start-stops under different operating modes in a short period. The unstable flow during these transient processes will lead to high-level stresses on the structural components of the pump-turbine units. Therefore, it is of great engineering and academic significance to study the flow characteristics and structural characteristics of the unit during the transient processes. This paper has established a numerical calculation model for a prototype reversible pump-turbine unit, has carried out the CFD calculations of the pump-turbine fluid domains during the pump shutdown transient process, and has analysed the corresponding structural dynamic characteristics of the stationary components of the unit with the fluid-structure coupling method. The pressure variation trend of the spiral case outlet during pump shutdown has the same trend as that of the spiral case domain, and the guide vane flow domain. The maximum flow-induced deformation and stress of the stationary structures have a strong correlation with the axial thrust values of the head cover. The maximum deformation occurs at the inner edge of the head cover, and the maximum stress appears in the fillet of the stay vane leading edge. An increase in the number of shutdowns will result in a higher real risk of fatigue damage to the stay vanes. The conclusions obtained are of great value for safe operation, field condition monitoring, fault diagnosis, and predictive maintenance of the pump-turbine units.

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Osama A. Gaheen, Mohamed A. Aziz, M. Hamza, Hoda Kashkoush, and Mohamed A. Khalifa. "Fluid and Structure Analysis of Wind Turbine Blade with Winglet." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 90, no. 1 (December 25, 2021): 80–101. http://dx.doi.org/10.37934/arfmts.90.1.80101.

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One of the succeeded methods to enhance the performance of horizontal axis wind turbine (HAWT) is an attaching a winglet to the blades tip. The current paper study the effect of four key parameters that are used to describe the winglet on the performance of wind turbine which are winglet height H%R, cant angle θ, twist angle β, and taper ratio Λ. A five design cases for each geometric parameters were numerically investigated using computational fluid dynamics (CFD) by ANSYS18.1 software, which totally give a twenty different response. A validation of present computational model with reference experimental results successfully carried out with maximum inconsistency of 3%. A mathematical correlation was established from the CFD results and being used in predicting the turbine power for the different winglet geometric parameters. From CFD and mathematical correlation response, the effect of H and θ were greater than β and Λ on the turbine power. The epoxy E-glass unidirectional material was selected for current study to investigate the effect of winglet on blade structure. The power increases by 2% to 30% due to adding winglet to a wind turbine blade. The maximum power increment corresponds to the design case of W6 with H= 8%R, =30°, β = 3°, and Λ = 0.8. Form the structural analysis the addition of winglet changes the stress distribution over the blade, increasing stresses at the blade root, and achieved the transfer of the maximum deformation from the blade tip to the winglet tip.

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Hetyei, Csaba, and Ferenc Szlivka. "COUNTER-ROTATING DUAL ROTOR WIND TURBINE LAYOUT OPTIMISATION." Acta Polytechnica 61, no. 2 (April 30, 2021): 342–49. http://dx.doi.org/10.14311/ap.2021.61.0342.

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General energy demand is continuously increasing, thus the energy generating assets need to be optimised for higher efficiency. Wind turbines are no exception. Their maximum efficiency can be determined on a theoretical basis. The limit is approached by researches day by day, utilizing the latest developments in airfoil design, blade structure and new and improved ideas in conventional and unconventional wind turbine layouts. In this paper, we are reviewing the conventional and unconventional wind turbines and their place in smart cities. Then, an unconventional wind turbine design, the CO-DRWT (counter-rotating dual rotor wind turbine) is analysed with a CFD (computational fluid dynamics) code, varying the axial and radial distances between the two turbines. After the simulations, the power coefficients for the different turbine configurations is calculated. At the end of this paper, the simulations results are summarized and consequences are drawn for the CO-DRWT layouts.

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Zhangaskanov, Dinmukhamed, Sagidolla Batay, Bagdaulet Kamalov, Yong Zhao, Xiaohui Su, and Eddie Yin Kwee Ng. "High-Fidelity 2-Way FSI Simulation of a Wind Turbine Using Fully Structured Multiblock Meshes in OpenFoam for Accurate Aero-Elastic Analysis." Fluids 7, no. 5 (May 11, 2022): 169. http://dx.doi.org/10.3390/fluids7050169.

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With increased interest in renewable energy, the power capacity of wind turbines is constantly increasing, which leads to increased rotor sizes. With ever larger rotor diameters, the complex and non-linear fluid-structure interaction (FSI) effects on wind turbine aerodynamic performances become significant, which can be fully studied using hi-fidelity 2-way FSI simulation. In this study, a two-way FSI model is developed and implemented in Openfoam to investigate the FSI effects on the NREL Phase VI wind turbine. The fully structured multiblock (MB) mesh method is used for the fluid and solid domains to achieve good accuracy. A coupling method based on the ALE is developed to ensure rotation and deformation can happen simultaneously and smoothly. The simulation results show that hi-fidelity CFD (Computational Fluid Dynamics) and CSD (Computational Structural Dynamics) -based 2-way FSI simulation provides high accurate results for wind turbine simulation and multi-disciplinary design optimization (MDO).

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Wang, Zhuoran, Gang Hu, Dongqin Zhang, Bubryur Kim, Feng Xu, and Yiqing Xiao. "Aerodynamic Characteristics of a Square Cylinder with Vertical-Axis Wind Turbines at Corners." Applied Sciences 12, no. 7 (March 30, 2022): 3515. http://dx.doi.org/10.3390/app12073515.

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A preliminary study is carried out to investigate the aerodynamic characteristics of a square cylinder with Savonius wind turbines and to explain the reason why this kind of structure can suppress wind-induced vibrations. A series of computational fluid dynamics simulations are performed for the square cylinders with stationary and rotating wind turbines at the cylinder corners. The turbine orientation and the turbine rotation speed are two key factors that affect aerodynamic characteristics of the cylinder for the stationary and rotating turbine cases, respectively. The numerical simulation results show that the presence of either the stationary or rotating wind turbines has a significant effect on wind forces acting on the square cylinder. For the stationary wind turbine cases, the mean drag and fluctuating lift coefficients decrease by 37.7% and 90.7%, respectively, when the turbine orientation angle is 45°. For the rotating wind turbine cases, the mean drag and fluctuating lift coefficients decrease by 34.2% and 86.0%, respectively, when the rotation speed is 0.2 times of vortex shedding frequency. Wind turbines installed at the corners of the square cylinder not only enhance structural safety but also exploit wind energy simultaneously.

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Qiao, Li Min, Rui Gu, Feng Feng, Xue Shan Liu, and Ying Jun Yang. "Fluid-Structure Analysis of Airfoils on the Small Wind Turbine." Advanced Materials Research 512-515 (May 2012): 613–16. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.613.

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Green energy resources are more and more fashionable and focused. Among of them, small wind turbine is popular and with many customers because it has an unique feature . The design and calculation on thickness of airfoils were studied in order to raise its life and reduce weight. In the premise of strength, the lighter, the better. This paper studied the aerodynamic performance of the airfoil under the Low-Reynolds and analyzed fluid-structure interaction effect under three different attack angles. The numerical simulation approach addresses unsteady Reynolds-averaged N-Stokes solutions and covers transition prediction for unsteady mean flows. The computational result and the analysis show that the fluid-structure interaction is an important issue to consider while designing the wind turbine blade. The results may provide technical reference for the further wind turbine design.

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Guma, Giorgia, Philipp Bucher, Patrick Letzgus, Thorsten Lutz, and Roland Wüchner. "High-fidelity aeroelastic analyses of wind turbines in complex terrain: fluid–structure interaction and aerodynamic modeling." Wind Energy Science 7, no. 4 (July 13, 2022): 1421–39. http://dx.doi.org/10.5194/wes-7-1421-2022.

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Abstract. This paper shows high-fidelity fluid–structure interaction (FSI) studies applied to the research wind turbine of the WINSENT (Wind Science and Engineering in Complex Terrain) project. In this project, two research wind turbines are going to be erected in the south of Germany in the WindForS complex-terrain test field. The FSI is obtained by coupling the CFD URANS–DES code FLOWer and the multiphysics FEM solver Kratos Multiphysics, in which both beam and shell structural elements can be chosen to model the turbine. The two codes are coupled in both an explicit and an implicit way. The different modeling approaches strongly differ with respect to computational resources, and therefore the advantages of their higher accuracy must be correlated with the respective additional computational costs. The presented FSI coupling method has been applied firstly to a single-blade model of the turbine under standard uniform inflow conditions. It could be concluded that for such a small turbine, in uniform conditions a beam model is sufficient to correctly build the blade deformations. Afterwards, the aerodynamic complexity has been increased considering the full turbine with turbulent inflow conditions generated from real field data, in both flat and complex terrains. It is shown that in these cases a higher structural fidelity is necessary. The effects of aeroelasticity are then shown on the phase-averaged blade loads, showing that using the same inflow turbulence, a flat terrain is mostly influenced by the shear, while the complex terrain is mostly affected by low-velocity structures generated by the forest. Finally, the impact of aeroelasticity and turbulence on the damage equivalent loading (DEL) is discussed, showing that flexibility reduces the DEL in the case of turbulent inflow, acting as a damper that breaks larger cycles into smaller ones.

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Ravi Kumar. P et al.,, Ravi Kumar P. et al ,. "Fluid-Structure Interaction Analysis on Horizontal Wind Turbine Blade." International Journal of Mechanical and Production Engineering Research and Development 8, no. 1 (2018): 283–98. http://dx.doi.org/10.24247/ijmperdfeb201832.

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LIU, Demin. "VIBRATION ANALYSIS OF TURBINE BASED ON FLUID-STRUCTURE COUPLING." Chinese Journal of Mechanical Engineering (English Edition) 21, no. 04 (2008): 40. http://dx.doi.org/10.3901/cjme.2008.04.040.

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Forbes, G. L., O. N. Alshroof, and R. B. Randall. "Fluid-structure interaction study of gas turbine blade vibrations." Australian Journal of Mechanical Engineering 8, no. 2 (January 2011): 143–50. http://dx.doi.org/10.1080/14484846.2011.11464605.

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Melot, Matthieu, Maxime Coulaud, Joël Chamberland-Lauzon, Bernd Nennemann, and Claire Deschênes. "Hydraulic turbine start-up: a fluid-structure simulation methodology." IOP Conference Series: Earth and Environmental Science 240 (March 27, 2019): 022024. http://dx.doi.org/10.1088/1755-1315/240/2/022024.

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Krawczyk, Piotr, Asfaw Beyene, and David MacPhee. "Fluid structure interaction of a morphed wind turbine blade." International Journal of Energy Research 37, no. 14 (January 10, 2013): 1784–93. http://dx.doi.org/10.1002/er.2991.

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Lahamornchaiyakul, Werayoot, and Nat Kasayapanand. "The Design and Analysis of a Novel Vertical Axis Small Water Turbine Generator for Installation in Drainage Lines." International Journal of Renewable Energy Development 12, no. 2 (January 4, 2023): 235–46. http://dx.doi.org/10.14710/ijred.2023.48388.

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The objective of this study was to determine the mechanical power efficiency of a novel vertical-axis small water turbine generator for installation in drainage lines. A 3D model was created to evaluate the performance of each design. The system was designed, analysed, and calculated for the most suitable geometries of the water inlet, drainage lines, main structure, and water turbine wheels using computational fluid dynamics software. The diameter of the water turbine wheel in the numerical model was 48 mm. The control volume technique was used in the numerical simulation method, and the k-epsilon turbulence model was employed to find the computational results. For the Computational Fluid Dynamics (CFD), the appropriate mash element for each model section was generated for numerical simulation, which showed that the torque from the water turbine modelling varied depending on the time domains and was related to speed relative to the developed force. The maximum torque and maximum power that a vertical-axis small water turbine for installation in a drainage line could generate at a maximum flow rate of 0.0030 m3/s were 0.55 N.m and 26.84 watts, respectively. Similarly, calculations with mathematical equations, found that the maximum mechanical power value after calculating the rate of loss within the pipe system was 12.95 watts. The forces generated by the speed and pressure of the fluid can then be applied to the structure of the water turbine wheel. The vertical-axis small water turbine for installation in a drainage line was analysed under its self-weight by applying a gravitational acceleration of 9.81 m/s2 in Solidworks Simulation software version 2022. The numerical simulations that resulted from this research could be used to further develop prototypes for small water turbines generating commercial electricity.

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Meng, Debiao, Miao Liu, Shunqi Yang, Hua Zhang, and Ran Ding. "A fluid–structure analysis approach and its application in the uncertainty-based multidisciplinary design and optimization for blades." Advances in Mechanical Engineering 10, no. 6 (June 2018): 168781401878341. http://dx.doi.org/10.1177/1687814018783410.

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In practical engineering, the choice of blade shape is crucial in the design process of turbine. It is because not only the structural stability but also the aerodynamic performance of turbine depends on the shape of blades. Generally, the design of blades is a typical multidisciplinary design optimization problem which includes many different disciplines. In this study, a fluid–structure coupling analysis approach is proposed to show the application of multidisciplinary design optimization in engineering. Furthermore, a strategy of uncertainty-based multidisciplinary design optimization using fluid–structure coupling analysis is proposed to enhance the reliability and safety of blades in turbine. The design of experiment technique is also introduced to construct response surface during uncertainty-based multidisciplinary design optimization using fluid–structure coupling analysis. The design solution shows that the adiabatic efficiency is increased and the equivalent stress is decreased, which means that better performance of the turbine can be obtained.

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Zhang, Jianping, Wenlong Chen, Tingjun Zhou, Helen Wu, Danmei Hu, and Jianxing Ren. "Analysis of dynamic stability for wind turbine blade under fluid-structure interaction." Journal of Vibroengineering 18, no. 2 (March 31, 2016): 1175–86. http://dx.doi.org/10.21595/jve.2015.16078.

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Aiming at improving vibration performance of 1.5 MW wind turbine blades, the theoretical model and the calculation process of vibration problems under geometric nonlinearity and unidirectional fluid-structure interaction (UFSI) were presented. The dynamic stability analysis on a 1.5 MW wind turbine blade was carried out. Both the maximum brandish displacement and the maximum Mises stress increase nonlinearly with the increase of wind speed. The influences of turbulent effect, wind shear effect and their joint effect on displacement and stress increase sequentially. Furthermore, the stability critical curves are calculated and analyzed. As a result, the stability region is established where the wind turbine blade can run safely.

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Hoerner, Stefan, Iring Kösters, Laure Vignal, Olivier Cleynen, Shokoofeh Abbaszadeh, Thierry Maître, and Dominique Thévenin. "Cross-Flow Tidal Turbines with Highly Flexible Blades—Experimental Flow Field Investigations at Strong Fluid–Structure Interactions." Energies 14, no. 4 (February 3, 2021): 797. http://dx.doi.org/10.3390/en14040797.

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Oscillating hydrofoils were installed in a water tunnel as a surrogate model for a hydrokinetic cross-flow tidal turbine, enabling the study of the effect of flexible blades on the performance of those devices with high ecological potential. The study focuses on a single tip-speed ratio (equal to 2), the key non-dimensional parameter describing the operating point, and solidity (equal to 1.5), quantifying the robustness of the turbine shape. Both parameters are standard values for cross-flow tidal turbines. Those lead to highly dynamic characteristics in the flow field dominated by dynamic stall. The flow field is investigated at the blade level using high-speed particle image velocimetry measurements. Strong fluid–structure interactions lead to significant structural deformations and highly modified flow fields. The flexibility of the blades is shown to significantly reduce the duration of the periodic stall regime; this observation is achieved through systematic comparison of the flow field, with a quantitative evaluation of the degree of chaotic changes in the wake. In this manner, the study provides insights into the mechanisms of the passive flow control achieved through blade flexibility in cross-flow turbines.

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Badshah, Mujahid, Saeed Badshah, and Kushsairy Kadir. "Fluid Structure Interaction Modelling of Tidal Turbine Performance and Structural Loads in a Velocity Shear Environment." Energies 11, no. 7 (July 13, 2018): 1837. http://dx.doi.org/10.3390/en11071837.

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Tidal Current Turbine (TCT) blades are highly flexible and undergo considerable deflection due to fluid interactions. Unlike Computational Fluid Dynamic (CFD) models Fluid Structure Interaction (FSI) models are able to model this hydroelastic behavior. In this work a coupled modular FSI approach was adopted to develop an FSI model for the performance evaluation and structural load characterization of a TCT under uniform and profiled flow. Results indicate that for a uniform flow case the FSI model predicted the turbine power coefficient CP with an error of 4.8% when compared with experimental data. For the rigid blade Reynolds Averaged Navier Stokes (RANS) CFD model this error was 9.8%. The turbine blades were subjected to uniform stress and deformation during the rotation of the turbine in a uniform flow. However, for a profiled flow the stress and deformation at the turbine blades varied with the angular position of turbine blade, resulting in a 22.1% variation in stress during a rotation cycle. This variation in stress is quite significant and can have serious implications for the fatigue life of turbine blades.

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Klein, Levin, Jonas Gude, Florian Wenz, Thorsten Lutz, and Ewald Krämer. "Advanced computational fluid dynamics (CFD)–multi-body simulation (MBS) coupling to assess low-frequency emissions from wind turbines." Wind Energy Science 3, no. 2 (October 17, 2018): 713–28. http://dx.doi.org/10.5194/wes-3-713-2018.

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Abstract. The low-frequency emissions from a generic 5 MW wind turbine are investigated numerically. In order to regard airborne noise and structure-borne noise simultaneously, a process chain is developed. It considers fluid–structure coupling (FSC) of a computational fluid dynamics (CFD) solver and a multi-body simulations (MBSs) solver as well as a Ffowcs-Williams–Hawkings (FW-H) acoustic solver. The approach is applied to a generic 5 MW turbine to get more insight into the sources and mechanisms of low-frequency emissions from wind turbines. For this purpose simulations with increasing complexity in terms of considered components in the CFD model, degrees of freedom in the structural model and inflow in the CFD model are conducted. Consistent with the literature, it is found that aeroacoustic low-frequency emission is dominated by the blade-passing frequency harmonics. In the spectra of the tower base loads, which excite seismic emission, the structural eigenfrequencies become more prominent with increasing complexity of the model. The main source of low-frequency aeroacoustic emissions is the blade–tower interaction, and the contribution of the tower as an acoustic emitter is stronger than the contribution of the rotor. Aerodynamic tower loads also significantly contribute to the external excitation acting on the structure of the wind turbine.

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Liu, Xue Feng, Jin Bao Wang, Mei Ling Tian, and Zhi Bo Tang. "Efficiency and Performance Analysis of Tidal Current Energy Turbine Basing on the Unidirectional Fluid-Structure Interaction." Applied Mechanics and Materials 672-674 (October 2014): 386–91. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.386.

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As the Key Components of a Horizontal Axis Tidal Current Energy(HATCE) Turbine, the Blades will be Affected by the Force of the Fluid when the Turbine is Working, which also Results in a Possible Effect on the Safety and Stability of the Tidal Current Energy Turbine. Thus, both the Structural Performance and Energy-Catching Efficiency of HATCE Turbine should be Paid Equal Attention. in this Study, Basing on the Workbench, the Energy-Catching Efficiency and Structure Performance of the Designed HATCE Turbine with Stainless Steel and Structural Steel at the Different Current Speeds are Comparatively Studied Using Unidirectional FSI Analysis Method. it can be Concluded that the Output Power of the Turbine is Lower at a Low Current Speed but its Energy-Catching Efficiency is Higher and Vise Versa. as a Result of Structure Performance Analysis, the Designed Turbine has Adequate Safetyunder all Loaded Conditions. Thus, the Designed Turbine Models are Available.

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Gad-el-Hak, Ibrahim. "Fluid–Structure Interaction for Biomimetic Design of an Innovative Lightweight Turboexpander." Biomimetics 4, no. 1 (March 22, 2019): 27. http://dx.doi.org/10.3390/biomimetics4010027.

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Inspired by bird feather structures that enable the resistance of powerful aerodynamic forces in addition to their lower weight to provide stable flight, a biomimetic composite turbine blade was proposed for a low-temperature organic Rankine cycle (ORC) turboexpander that is capable of producing lower weight expanders than that of stainless steel expanders, in addition to reduce its manufacturing cost, and hence it may contribute in spreading ORC across nonconventional power systems. For that purpose, the fluid–structure interaction (FSI) was numerically investigated for a composite turbine blade with bird-inspired fiber orientations. The aerodynamic forces were evaluated by computational fluid dynamics (CFD) using the commercial package ANSYS-CFX (version 16.0) and then these aerodynamic forces were transferred to the solid model of the proposed blade. The structural integrity of the bird-mimetic composite blade was investigated by performing finite element analysis (FEA) of composite materials with different fiber orientations using ANSYS Composite PrepPost (ACP). Furthermore, the obtained mechanical performance of the composite turbine blades was compared with that of the stainless steel turbine blades. The obtained results indicated that fiber orientation has a greater effect on the deformation of the rotor blades and the minimum value can be achieved by the same barb angle inspired from the flight feather. In addition to a significant effect in the weight reduction of 80% was obtained by using composite rotor blades instead of stainless steel rotor blades.

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Zhang, Fu Xing, Yuan Zheng, Chun Xia Yang, Xiang Long Jin, and Lin Ding. "Stress Analysis of Tubular Turbine Based on Fluid-Structure Coupling." Applied Mechanics and Materials 190-191 (July 2012): 1261–65. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.1261.

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A brief introduction of fluid-structure coupling and its classification were given, then according to the solving characteristics and application conditions of different coupling methods; sequential coupling method is chosen to calculate the stress distribution of a tide power plant tubular turbine. Stress calculations of the tubular turbine were conducted under the maximum water head, the designed water head, the average water head and the minimum water head working conditions in ANSYS Workbench. The research shows that in all of the four calculated working conditions, the maximum equivalent stress of the runner is located at the connection between the blades and the hub where stress concentration is obvious; the maximum deformation of the runner lies in the outer edge of the blades and the deformation increases from the root to the outer edge; the maximum equivalent stress of the guide vane is located at the root and the maximum deformation lies in the outer edge. The maximum value of maximum equivalent stress of the runner and the guide vane occurs on the maximum water head working condition, whereas it is far less than the material yield limit, which means that static stress will not lead to the cracks of the blade or the guide vane. But it is still necessary to avoid stress concentration appearing periodically in case it causes fatigue failure.

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Østby, Petter T. K., Einar Agnalt, Bjørn Haugen, Jan Tore Billdal, and Ole Gunnar Dahlhaug. "Fluid structure interaction of Francis-99 turbine and experimental validation." Journal of Physics: Conference Series 1296 (August 2019): 012006. http://dx.doi.org/10.1088/1742-6596/1296/1/012006.

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Marzec, Łukasz, Zbigniew Buliński, and Tomasz Krysiński. "Fluid structure interaction analysis of the operating Savonius wind turbine." Renewable Energy 164 (February 2021): 272–84. http://dx.doi.org/10.1016/j.renene.2020.08.145.

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Robin, Ilan, Anne-Claire Bennis, and Jean-Claude Dauvin. "3D Simulation with Flow-Induced Rotation for Non-Deformable Tidal Turbines." Journal of Marine Science and Engineering 9, no. 3 (February 26, 2021): 250. http://dx.doi.org/10.3390/jmse9030250.

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The overall potential for recoverable tidal energy depends partly on the tidal turbine technologies used. One of problematic points is the minimum flow velocity required to set the rotor into motion. The novelty of the paper is the setup of an innovative method to model the fluid–structure interactions on tidal turbines. The first part of this work aimed at validating the numerical model for classical cases of rotation (forced rotation), in particular, with the help of a mesh convergence study. Once the model was independent from the mesh, the numerical results were tested against experimental data for both vertical and horizontal tidal turbines. The results show that a good correspondence for power and drag coefficients was observed. In the wake, the vortexes were well captured. Then, the fluid drive code was implemented. The results correspond to the expected physical behavior. Both turbines rotated in the correct direction with a coherent acceleration. This study shows the fundamental operating differences between a horizontal and a vertical axis tidal turbine. The lack of experiments with the free rotation speed of the tidal turbines is a limitation, and a digital brake could be implemented to overcome this difficulty.

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He, Qilian, Xingxing Huang, Mengqi Yang, Haixia Yang, Huili Bi, and Zhengwei Wang. "Fluid–Structure Coupling Analysis of the Stationary Structures of a Prototype Pump Turbine during Load Rejection." Energies 15, no. 10 (May 20, 2022): 3764. http://dx.doi.org/10.3390/en15103764.

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During the load rejection transient process of the prototype pump turbine units, the pressure fluctuations of the entire flow passage change drastically due to the rapid closing of guide vanes. The extremely unsteady pressure distribution in the flow domains including the crown chamber and the band chamber may cause a strong vibration on the stationary structures of the unit and result in large dynamic stress on the head cover, stay ring and bottom ring. In this paper, the numerical fluid dynamic analysis of the entire flow passage of a reversible prototype pump turbine during load rejection was performed. The flow characteristics in the runner passage, crown chamber, band chamber, seal labyrinths and balance tubes are analysed. The corresponding unsteady flow-induced dynamic behaviour of the head cover, stay vanes and bottom ring was investigated in detail. The analysed results show that the total deformation of the inner edge of the head cover closed to the main shaft is larger than that of other stationary structures of the unit during the load rejection. The maximum stress of the stay ring is larger than that of the head cover and the bottom ring and the maximum equivalent stress is located at the fillet of the stay vane trailing edge. The fluid–structure coupling calculation method and the analysed results can provide guidance for the design of stationary components of hydraulic machinery such as pump turbines, Francis turbines and centrifugal pumps with different heads.

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Yaseen, Zaher Mundher, Ameen Mohammed Salih Ameen, Mohammed Suleman Aldlemy, Mumtaz Ali, Haitham Abdulmohsin Afan, Senlin Zhu, Ahmed Mohammed Sami Al-Janabi, Nadhir Al-Ansari, Tiyasha Tiyasha, and Hai Tao. "State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations." Sustainability 12, no. 4 (February 24, 2020): 1676. http://dx.doi.org/10.3390/su12041676.

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Dam and powerhouse operation sustainability is a major concern from the hydraulic engineering perspective. Powerhouse operation is one of the main sources of vibrations in the dam structure and hydropower plant; thus, the evaluation of turbine performance at different water pressures is important for determining the sustainability of the dam body. Draft tube turbines run under high pressure and suffer from connection problems, such as vibrations and pressure fluctuation. Reducing the pressure fluctuation and minimizing the principal stress caused by undesired components of water in the draft tube turbine are ongoing problems that must be resolved. Here, we conducted a comprehensive review of studies performed on dams, powerhouses, and turbine vibration, focusing on the vibration of two turbine units: Kaplan and Francis turbine units. The survey covered several aspects of dam types (e.g., rock and concrete dams), powerhouse analysis, turbine vibrations, and the relationship between dam and hydropower plant sustainability and operation. The current review covers the related research on the fluid mechanism in turbine units of hydropower plants, providing a perspective on better control of vibrations. Thus, the risks and failures can be better managed and reduced, which in turn will reduce hydropower plant operation costs and simultaneously increase the economical sustainability. Several research gaps were found, and the literature was assessed to provide more insightful details on the studies surveyed. Numerous future research directions are recommended.

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Marchewka, Emil, Krzysztof Sobczak, Piotr Reorowicz, Damian Obidowski, and Krzysztof Jóźwik. "Influence of Tip Speed Ratio on the efficiency of Savonius wind turbine with deformable blades." Journal of Physics: Conference Series 2367, no. 1 (November 1, 2022): 012003. http://dx.doi.org/10.1088/1742-6596/2367/1/012003.

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Abstract Improving machines efficiency and searching for their new applications are the main topics in the development of the renewable energy industry. In the case of Savonius type wind turbines, the works aim at the improvement of aerodynamic performance. The CFD simulations of a turbine equipped with deformable blades showed a significant positive impact of this enhancement on the machine aerodynamic efficiency. Previously, the investigation was carried out for a TSR (Tip Speed Ratio) equal to 0.8, typically recognized as the point of maximal efficiency for conventional Savonius wind turbines with rigid blades. However, the continuously altering shape of blades during their rotation can influence the optimal TSR. Therefore, the efficiency of the deformable blade turbine was investigated in a wide range of TSR. In this paper, the previously developed quasi-2D model with a two-way Fluid-Structure Interaction method was employed to obtain turbine efficiency characteristics as a function of TSR. The maximum power coefficient Cp was achieved at TSR = 0.9. Obtained characteristic was compared with data for a conventional rigid blades turbine, gathered with a comparable sliding mesh model.

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Roul, Rajendra, and Awadhesh Kumar. "Fluid-Structure Interaction of Wind Turbine Blade Using Four Different Materials: Numerical Investigation." Symmetry 12, no. 9 (September 7, 2020): 1467. http://dx.doi.org/10.3390/sym12091467.

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The interaction of a flexible system with a moving fluid gives rise to a wide variety of physical phenomena with applications in various engineering fields, such as aircraft wing stability, arterial blood progression, high structure reaction to winds, and turbine blade vibration. Both the structure and fluid need to be modeled to understand these physical phenomena. However, in line with the overall theme of this strength, the focus here is to investigate wind turbine aerodynamic and structural analysis by combining computational fluid dynamics (CFD) and finite element analysis (FEA). One-way coupling is chosen for the fluid-structure interaction (FSI) modeling. The investigation is carried out with the use of commercialized ANSYS applications. A total of eight different wind velocities and five different angles of pitch are considered in this analysis. The effect of pitch angles on the output of a wind turbine is also highlighted. The SST k-ω turbulence model has been used. A structural analysis investigation was also carried out and is carried out after importing the pressure load exerted from the aerodynamic analysis and subsequently finding performance parameters such as deformation and Von-Mises stress.

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Qiao, Li Min, Xue Shan Liu, Yong Bo Yang, Yong Gang Jia, and Xiao Lin Quan. "Fluid Structure Interaction Simulation on the Seagull Airfoil of the Small Wind Turbine." Advanced Materials Research 546-547 (July 2012): 160–65. http://dx.doi.org/10.4028/www.scientific.net/amr.546-547.160.

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For the blades of the small wind turbine working under the conditions of Low-Reynolds, the air viscosity has relatively great influence on them. The design and calculation on thickness of airfoils were studied in order to raise its life and reduce weight. In the premise of strength, the lighter, the better. This paper studied the aerodynamic performance of the airfoil under the Low-Reynolds and analyzed fluid-structure interaction effect at Reynolds number 600,000 under three different attack angles. The numerical simulation approach addresses unsteady Reynolds-averaged N-S solutions and covers transition prediction for unsteady mean flows. The computational result and the analysis show that the fluid-structure interaction is an important issue to consider while designing the wind turbine blade. The results may provide technical reference for the further wind turbine design.

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Grinderslev, Christian, Niels Nørmark Sørensen, Sergio González Horcas, Niels Troldborg, and Frederik Zahle. "Wind turbines in atmospheric flow: fluid–structure interaction simulations with hybrid turbulence modeling." Wind Energy Science 6, no. 3 (May 6, 2021): 627–43. http://dx.doi.org/10.5194/wes-6-627-2021.

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Abstract. In order to design future large wind turbines, knowledge is needed about the impact of aero-elasticity on the rotor loads and performance and about the physics of the atmospheric flow surrounding the turbines. The objective of the present work is to study both effects by means of high-fidelity rotor-resolved numerical simulations. In particular, unsteady computational fluid dynamics (CFD) simulations of a 2.3 MW wind turbine are conducted, this rotor being the largest design with relevant experimental data available to the authors. Turbulence is modeled with two different approaches. On one hand, a model using the well-established technique of improved delayed detached eddy simulation (IDDES) is employed. An additional set of simulations relies on a novel hybrid turbulence model, developed within the framework of the present work. It consists of a blend of a large-eddy simulation (LES) model by Deardorff for atmospheric flow and an IDDES model for the separated flow near the rotor geometry. In the same way, the assessment of the influence of the blade flexibility is performed by comparing two different sets of computations. The first group accounts for a structural multi-body dynamics (MBD) model of the blades. The MBD solver was coupled to the CFD solver during run time with a staggered fluid–structure interaction (FSI) scheme. The second set of simulations uses the original rotor geometry, without accounting for any structural deflection. The results of the present work show no significant difference between the IDDES and the hybrid turbulence model. In a similar manner, and due to the fact that the considered rotor was relatively stiff, the loading variation introduced by the blade flexibility was found to be negligible when compared to the influence of inflow turbulence. The simulation method validated here is considered highly relevant for future turbine designs, where the impact of blade elasticity will be significant and the detailed structure of the atmospheric inflow will be important.

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42

Wang, Mingyang, Eldad J. Avital, Xin Bai, Chunning Ji, Dong Xu, John J. R. Williams, and Antonio Munjiza. "Fluid–structure interaction of flexible submerged vegetation stems and kinetic turbine blades." Computational Particle Mechanics 7, no. 5 (December 13, 2019): 839–48. http://dx.doi.org/10.1007/s40571-019-00304-6.

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AbstractA fluid–structure interaction (FSI) methodology is presented for simulating elastic bodies embedded and/or encapsulating viscous incompressible fluid. The fluid solver is based on finite volume and the large eddy simulation approach to account for turbulent flow. The structural dynamic solver is based on the combined finite element method–discrete element method (FEM-DEM). The two solvers are tied up using an immersed boundary method (IBM) iterative algorithm to improve information transfer between the two solvers. The FSI solver is applied to submerged vegetation stems and blades of small-scale horizontal axis kinetic turbines. Both bodies are slender and of cylinder-like shape. While the stem mostly experiences a dominant drag force, the blade experiences a dominant lift force. Following verification cases of a single-stem deformation and a spinning Magnus blade in laminar flows, vegetation flexible stems and flexible rotor blades are analysed, while they are embedded in turbulent flow. It is shown that the single stem’s flexibility has higher effect on the flow as compared to the rigid stem than when in a dense vegetation patch. Making a marine kinetic turbine rotor flexible has the potential of significantly reducing the power production due to undesired twisting and bending of the blades. These studies point to the importance of FSI in flow problems where there is a noticeable deflection of a cylinder-shaped body and the capability of coupling FEM-DEM with flow solver through IBM.

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Zheng, Xing, Yu Yao, Zhenhong Hu, Ziying Yu, and Siyuan Hu. "Influence of Turbulence Intensity on the Aerodynamic Performance of Wind Turbines Based on the Fluid-Structure Coupling Method." Applied Sciences 13, no. 1 (December 25, 2022): 250. http://dx.doi.org/10.3390/app13010250.

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The deformation and vibration of wind turbine blades in turbulent environment cannot be ignored; therefore, in order to better ensure the safety of wind turbine blades, the study of air-elastic response of wind turbine blades under turbulent wind is indispensable. In this paper, the NREL 5MW wind turbine blades are modeled with accurate 3D lay-up design, firstly, based on the joint simulation of commercial software STAR CCM+ and ABAQUS, the two-way fluid-solid coupling technology, the wind turbine under uniform wind condition is simulated, and the results from thrust, torque, structural deformation and force perspective and FAST are compared with good accuracy and consistency below the rated wind speed. Secondly, the aerodynamic performance, flow field distribution and structural response of turbulent winds with different turbulence strengths at 10 m/s were studied. The results show that the turbulence intensity has a greater impact on the amplitude of the wind turbine blade, and the stress distribution of the blade is more concentrated, which in turns affects the stability and safety of the wind turbine blade and is not conducive to the normal operation of the wind turbine.

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Suhri, Gisrina Elin, Anas Abdul Rahman, Lakshuman Dass, Kumaran Rajendran, and Ayu Abdul Rahman. "INTERACTIONS BETWEEN TIDAL TURBINE WAKES: NUMERICAL STUDY FOR SHALLOW WATER APPLICATION." Jurnal Teknologi 84, no. 4 (May 30, 2022): 91–101. http://dx.doi.org/10.11113/jurnalteknologi.v84.17731.

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The placement of tidal turbines in a tidal farm is challenging owing to the flow resistance caused by individual devices. To successfully deploy tidal turbines, the wake interaction between devices, often determined by the array's layout and spacing, must be understood. In this study, the impact of array configuration for shallow water application is examined numerically using computational fluid dynamics (CFD). This is to propose a suitable array structure for possible implementation in Malaysia. This numerical study uses 15 turbines in a staggered and squared array with two sets of lateral and longitudinal spacing combinations. The horizontal axis tidal turbine (HATT) and vertical axis tidal turbine (VATT) are represented using disc and cylindrical models, respectively. The VATT with staggered setup and greater spacing model demonstrates faster wake recovery (between 10% to 21%), compared to the squared arrangement. This meets the far wake criteria and reduces the chance of wake mixing. It is also suitable for shallow depth implementation.

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Zhou, Mingyue, Matias Sessarego, Hua Yang, and Wen Zhong Shen. "Development of an Advanced Fluid-Structure-Acoustics Framework for Predicting and Controlling the Noise Emission from a Wind Turbine under Wind Shear and Yaw." Applied Sciences 10, no. 21 (October 28, 2020): 7610. http://dx.doi.org/10.3390/app10217610.

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Noise generated from wind turbines is a big challenge for the wind energy industry to develop further onshore wind energy. The traditional way of reducing noise is to design low noise wind turbine airfoils and blades. A wind turbine operating under wind shear and in yaw produces periodic changes of blade loading, which intensifies the amplitude modulation (AM) of the generated noise, and thus can give more annoyance to the people living nearby. In this paper, the noise emission from a wind turbine under wind shear and yaw is modelled with an advanced fluid-structure-acoustics framework, and then controlled with a pitch control strategy. The numerical tool used in this study is the coupled Navier–Stokes/Actuator Line model EllipSys3D/AL, structure model FLEX5, and noise prediction model (Brooks, Pope and Marcolini: BPM) framework. All simulations and tests were made on the NM80 wind turbine equipped with three blades made by LM Wind Power. The coupled code was first validated against field load measurements under wind shear and yaw, and a fairly good agreement was obtained. The coupled code was then used to study the noise source control of the turbine under wind shear and yaw. Results show that in the case of a moderate wind shear with a shear exponent of 0.3, the pitch control strategy can reduce the mean noise emission about 0.4 dB and reduce slightly the modulation depth that mainly occurs in the low-frequency region.

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Ageze, Mesfin Belayneh, Yefa Hu, and Huachun Wu. "Wind Turbine Aeroelastic Modeling: Basics and Cutting Edge Trends." International Journal of Aerospace Engineering 2017 (2017): 1–15. http://dx.doi.org/10.1155/2017/5263897.

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The interaction of fluid flow and the structure dynamic of the system is a vital subject for machines operating under their coupling. It is not different for wind turbine either, especially as the coupling enhanced for multi-MW turbine with larger and flexible blades and complex control methods, and other nonlinearity, more comprehensive aeroelastic tools will be required to investigate the realistic phenomena. The present paper will overview the aeroelastic tool for wind turbine, the efforts done, gaps, and future directions indicated. One starts with background of the subject, presenting a case study to demonstrate the effect of fluid-structure interaction considering NREL 5MW blade and a brief comparison of several aeroelastic codes. Cutting edge efforts done in the area such as complex inflow, effect of geometric nonlinearity, and other stability and smart control issues are addressed and concluded by elaborating the gaps and future direction of aeroelasticity of wind turbine.

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Zhang, D., A. Engeda, J. R. Hardin, and R. H. Aungier. "Experimental study of steam turbine control valves." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 218, no. 5 (May 1, 2004): 493–507. http://dx.doi.org/10.1243/095440604323052283.

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Because of the converging-diverging configuration of the valve passage, venturi valves have been widely used in large turbines to regulate inlet flow as turbine governing valves for about half a century. From the 1960s, a number of valve failure incidents have been reported. Improvement to current designs was strongly demanded but, owing to the complicated nature of the fluid-structure interaction mechanisms, the basic mechanism causing valve failure is still far from being fully understood. Experimental investigations on a half-scale valve were performed here. The study confirmed that asymmetric unstable flow is the root cause of valve problems, such as noise, vibration and failure.

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Huang, Ya-Nan, Wen-Hua Wang, Jun Liu, and Yan-Ying Wang. "Special Motion Characteristic of Wind Turbine Installation Vessel in Waves." International Journal of Computational Methods 17, no. 05 (June 6, 2019): 1940007. http://dx.doi.org/10.1142/s0219876219400073.

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Wind turbine installation vessel (WTIV) is a kind of special ship that has large upper deck and shallow draft, which is specifically designed for the installation of offshore wind turbines. However, accurately predicting the motion of WTIV is still a challenge. In this paper, computational fluid dynamics (CFD) is adopted to investigate the motion of WTIV under different wave conditions in a three-dimensional numerical wave tank using commercial software Star-CCM+. Reynolds Averaged Navier–Stokes (RANS) equations and [Formula: see text] turbulent models are used for modeling the turbulent flow, and volume of fluid (VOF) method is applied to track the location and shape of transit-free surface. The overset grid technique is taken to handle the fluid–structure interaction (FSI) problem with large motion amplitude. The simulation results have been validated by comparing with the experimental data, and show potential to provide theoretical guidance and technical support for the motion of WTIV in waves.

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Wiegard, B., M. König, J. Lund, L. Radtke, S. Netzband, M. Abdel-Maksoud, and A. Düster. "Fluid-structure interaction and stress analysis of a floating wind turbine." Marine Structures 78 (July 2021): 102970. http://dx.doi.org/10.1016/j.marstruc.2021.102970.

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Schmucker, Hannes, Felix Flemming, and Stuart Coulson. "Two-Way Coupled Fluid Structure Interaction Simulation of a Propeller Turbine." International Journal of Fluid Machinery and Systems 3, no. 4 (December 31, 2010): 342–51. http://dx.doi.org/10.5293/ijfms.2010.3.4.342.

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Journal articles on the topic 'Turbine fluid-structure'

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