Journal articles: 'CFD experimental'

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Burger, C. J., S. J. van der Spuy, and T. W. von Backström. "Design of a Compact Crossover Diffuser for Micro Gas Turbines Using a Mean-Line Code." International Journal of Turbo & Jet-Engines 36, no. 4 (November 18, 2019): 347–57. http://dx.doi.org/10.1515/tjj-2017-0021.

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Abstract The design and validation of a Compact Crossover Diffuser (CCD) to replace the size-limited radial diffuser and axial de-swirl cascade of an existing Micro Gas Turbine (MGT) is discussed. A CCD strives to combine the performance of a channel diffuser with the operating range and efficiency of a vaneless diffuser. The development of a one-dimensional Mean-Line Code (MLC) is presented, which aids the designer in preliminary design and performance evaluation of the CCD. Design graphs indicating the performance effects of changing the primary design variables are developed and shown. The MLC is numerically validated using Computational Fluid Dynamics (CFD). Good agreement is seen between the MLC and CFD results, predicting the design point PRss(2-4) to within 1.4 %. A CFD optimized CCD was manufactured and tested. Agreement between the CFD and experimental results for PRts(0-4) is within 7.58 % at 106 kRPM. A numerically predicted increase in PRts(0-4) from 3.31, to 3.53, to 3.83 is seen for the vaneless-, MLC optimized-, and CFD optimized-design respectively. An experimental increase of 82.3 % in engine thrust and 80.0 % in total-to-static pressure recovery across the compressor stage was measured when retrofitting the BMT120KS with a new impeller and CCD.

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Minson, A. J., C. J. Wood, and R. E. Belcher. "Experimental velocity measurements for CFD validation." Journal of Wind Engineering and Industrial Aerodynamics 58, no. 3 (December 1995): 205–15. http://dx.doi.org/10.1016/0167-6105(95)00025-9.

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Leishear, Robert A. "CFD & Safety Factors." Mechanical Engineering 135, no. 02 (February 1, 2013): 30–35. http://dx.doi.org/10.1115/1.2013-feb-3.

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This article presents a research that demonstrates the need for experimental validation of computational fluid dynamics (CFD) models for complex processes, such as blending. An additional result of the study is that it provided researchers a better understanding of how to use CFD models in general. The principle for blending is the same for all blender-pump designs: the business end of a centrifugal pump will be submerged in the salt solutions in the tank. Lab researchers found that, although CFD provided good estimates of an average blending time, experimental blending times varied significantly from the average. The issue of experimental uncertainty is inherent in CFD modeling as well as in many empirical equations used for modeling and design methods. In order to bring all of this research together, the process variables investigated were the fluid velocities in the tanks and the times required to blend the fluids. The large scatter in experimental data shows that large errors can be obtained from CFD models in the absence of experimental correction factors.

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Mañes, Jorge Pérez, Victor Hugo Sánchez Espinoza, Sergio Chiva Vicent, Michael Böttcher, and Robert Stieglitz. "Validation of NEPTUNE-CFD Two-Phase Flow Models Using Experimental Data." Science and Technology of Nuclear Installations 2014 (2014): 1–19. http://dx.doi.org/10.1155/2014/185950.

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This paper deals with the validation of the two-phase flow models of the CFD code NEPTUNEC-CFD using experimental data provided by the OECD BWR BFBT and PSBT Benchmark. Since the two-phase models of CFD codes are extensively being improved, the validation is a key step for the acceptability of such codes. The validation work is performed in the frame of the European NURISP Project and it was focused on the steady state and transient void fraction tests. The influence of different NEPTUNE-CFD model parameters on the void fraction prediction is investigated and discussed in detail. Due to the coupling of heat conduction solver SYRTHES with NEPTUNE-CFD, the description of the coupled fluid dynamics and heat transfer between the fuel rod and the fluid is improved significantly. The averaged void fraction predicted by NEPTUNE-CFD for selected PSBT and BFBT tests is in good agreement with the experimental data. Finally, areas for future improvements of the NEPTUNE-CFD code were identified, too.

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Ribeiro, J. A., A. S. Reis, P. S. Avendaño, C. H. Ataíde, and Marcos A. S. Barrozo. "Experimental and CFD Simulation of a Bubble Column." Materials Science Forum 727-728 (August 2012): 1824–29. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.1824.

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The numerical simulation in fluid mechanics has large application in chemical engineering. The objective of the present work is the analyze of a computational model for the fluid dynamics behaviour of a bubble column of the geometry cylindrical non regular with multiphase mixture. Experimental data and CFD results of the hydrodynamics of gaseous and liquid phases have been compared. Five different diameters of bubbles have been used in the CFD simulations. The comparisons between CFD simulations and experimental data show that the Eulerian-Eulerian approach provides a computational model that represents the process satisfactorily.

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ra, Jai Sagar, Nagalli Raghu, G. V. Dev. "Experimental Analysis on Catalytic Converter Using CFD." International Journal of Innovative Research in Science, Engineering and Technology 04, no. 07 (July 15, 2015): 5251–61. http://dx.doi.org/10.15680/ijirset.2015.0407029.

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WADA, Yasuhiro. "Validation of Hypervelocity CFD using Experimental Data." Journal of the Japan Society for Aeronautical and Space Sciences 41, no. 475 (1993): 466–71. http://dx.doi.org/10.2322/jjsass1969.41.466.

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Jadhav, Ganesh K., P. M. Ghanegaonkar, and Sharad Garg. "Experimental and CFD analysis of turbo ventilator." Journal of Building Engineering 6 (June 2016): 196–202. http://dx.doi.org/10.1016/j.jobe.2016.04.001.

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Chen, Ming Zhou, and Qi Dou Zhou. "Numerical Simulation of Fluctuating Propeller Forces and Comparison with Experimental Data." Applied Mechanics and Materials 105-107 (September 2011): 518–22. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.518.

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Unsteady CFD method based on realizable k-ε model is used for predicting unsteady forces of propeller working in non-uniform wake. First, CFD computations with different mesh scales were conducted at the propeller design condition, the results show that mesh refinement changed the results little. Then unsteady CFD simulation with different time step intervals was conducted for determining suitable time step interval, the results show that it is suitable for propeller rotating 3° per step. Based on the chosen mesh and time step interval, unsteady CFD simulation of propeller P4118 was conducted in 3-cycle and 4-cycle inflow, the unsteady thrust, torque and horizontal force agree well with experimental data, the results show that CFD method has good accuracy in predicting unsteady propeller forces.

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Vasan, A. Mercy, N. Prasanna, M. Vivekanandan, and V. Gopalakrishnan. "CFD investigation of the cold hydrodynamics of a laboratory scale CFB furnace." JOURNAL OF ADVANCES IN CHEMISTRY 12, no. 9 (November 2, 2016): 4330–40. http://dx.doi.org/10.24297/jac.v12i9.4092.

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This investigation presents a computational and experimental study of the flow characteristics of a laboratory scale CFB cold model riser. i) The first part of the work deals with 2D, CFD validation of a literature based CFB riser of circular cross section of 1m height. Simulation results showed good agreement with experimental literature data for radial profiles of volume fraction and particle velocity. ii) The second part is a work on simulation and experimental verification of a CFB riser flow characteristics of a CFB riser of rectangular cross section (400mm x 550mm x2000mm). An experimental run on the test rig was conducted for sand of 300 micron size at a fluidization velocity of 4 m/s and the fluidization behavior was captured on a high speed camera. For simulation, 3D, transient, Euler-ian approach combined with the Kinetic theory of Granular flow and Gidaspow drag model was used to describe the gas–particle behavior. A frame by frame visual comparison of instantaneous volume fraction distribution was made between camera images and 3D simulated profiles. A further graphical comparison between experimental literature data and simulated 3D profiles of volume fraction and particle velocity profiles yielded fairly good results. It was observed that, in spite of non inclusion of turbulence factor in the current 3D simulation, no significant influence was observed in the results

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Lizzoli, Matteo, Walter Borreani, Francesco Devia, Guglielmo Lomonaco, and Mariano Tarantino. "Preliminary CFD Assessment of an Experimental Test Facility Operating with Heavy Liquid Metals." Science and Technology of Nuclear Installations 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/1949673.

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The CFD analysis of a Venturi nozzle operating in LBE (key component of the CIRCE facility, owned by ENEA) is presented in this paper. CIRCE is a facility developed to investigate in detail the fluid-dynamic behavior of ADS and/or LFR reactor plants. The initial CFD simulations have been developed hand in hand with the comparison with experimental data: the test results were used to confirm the reliability of the CFD model, which, in turn, was used to improve the interpretation of the experimental data. The Venturi nozzle is modeled with a 3D CFD code (STAR-CCM+). Later on, the CFD model has been used to assess the performance of the component in conditions different from the ones tested in CIRCE: the performance of the Venturi is presented, in terms of pressure drops, for various operating conditions. Finally, the CFD analysis has been focused on the evaluation of the effects of the injection of an inert gas in the flow of the liquid coolant on the performance of the Venturi nozzle.

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van Driel, Michael R. "Cardioplegia heat exchanger design modelling using computational fluid dynamics." Perfusion 15, no. 6 (December 2000): 541–48. http://dx.doi.org/10.1177/026765910001500611.

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A new cardioplegia heat exchanger has been developed by Sorin Biomedica. A three-dimensional computer-aided design (CAD) model was optimized using computational fluid dynamics (CFD) modelling. CFD optimization techniques have commonly been applied to velocity flow field analysis, but CFD analysis was also used in this study to predict the heat exchange performance of the design before prototype fabrication. The iterative results of the optimization and the actual heat exchange performance of the final configuration are presented in this paper. Based on the behaviour of this model, both the water and blood fluid flow paths of the heat exchanger were optimized. The simulation predicted superior heat exchange performance using an optimal amount of energy exchange surface area, reducing the total contact surface area, the device priming volume and the material costs. Experimental results confirm the empirical results predicted by the CFD analysis.

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Fatimah Yusop, Syafiq Syazwan Mustafa, Mariah Awang, Nik Normunira Mat Hassan, and Hafsa Mohd Noor. "Comparison of Pressure Distribution of Naca 0012 Between CFD Code and Experimental." CFD Letters 14, no. 2 (March 2, 2022): 35–41. http://dx.doi.org/10.37934/cfdl.14.2.3541.

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Computational Fluid Dynamics (CFD) is a tool to solve engineering problem. Commercial CFD code are being used most engineering problem but rarely for external aerodynamic problem due some limitation of features. Compare to in house CFD code that able to written in certain area of interest and also implement specific discretization scheme to increase accuracy. In this work, the CFD code are developed by using high resolution scheme (ROE scheme and TVD scheme) for flow past through airfoil NACA 0012. Experimental result of wind tunnel is obtained from literature which are from Gregory and O’Reilly at Mach number M = 0.13 for different values of angle of attack at α= 0° and α = 10°. Another wind tunnel result from Haris at Mach number = 0.8 for different angles of attack α= 0° and α= 3.86°. Comparison results from the both codes indicate that developed CFD code by using TVD scheme able to give the closest result for both experimental.

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Gonzales, Howell B., John Tatarko, Mark E. Casada, Ronaldo G. Maghirang, Lawrence J. Hagen, and Charles J. Barden. "Computational Fluid Dynamics Simulation of Airflow through Standing Vegetation." Transactions of the ASABE 62, no. 6 (2019): 1713–22. http://dx.doi.org/10.13031/trans.13449.

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Abstract. Maintaining vegetative cover on the soil surface is the most widely used method for control of soil loss by wind erosion. We numerically modeled airflow through artificial standing vegetation (i.e., simulated wheat plants) using computational fluid dynamics (CFD). A solver (simpleFoam within the OpenFOAM software architecture) was used to simulate airflow through various three-dimensional (3D) canopy structures in a wind tunnel, which were created using another open-source CAD geometry software (Salomé ver. 7.2). This study focused on two specific objectives: (1) model airflow through standing vegetation using CFD, and (2) compare the results of a previous wind tunnel study with various artificial vegetation configurations to the results of the CFD model. Wind speeds measured in the wind tunnel experiment differed slightly from the numerical simulation using CFD, especially near positions where simulated vegetation was present. Effective drag coefficients computed using wind profiles did not differ significantly (p <0.05) between the experimental and simulated results. Results of this study will provide information for research into other types of simulated stubble or sparse vegetation during wind erosion events.HighlightsMeasured airflow through a simulated canopy was successfully modeled using CFD software.Effective drag coefficients did not differ between the experimental and simulated results.Results of this study provide 3-D simulation data of wind flow through a plant canopy. Keywords: 3-D canopy structure, OpenFOAM, Wind erosion, Wind tunnel studies.

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Huang, Zhong, Lei Deng, and Defu Che. "Experimental and CFD Simulation Studies on Bell-Type Air Nozzles of CFB Boilers." Applied Sciences 9, no. 18 (September 11, 2019): 3805. http://dx.doi.org/10.3390/app9183805.

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In this paper, a new bell-type air nozzle, which overcomes the structural defects of traditional bell-type air nozzles, is proposed and validated by cold test and numerical simulation. The pressure drop characteristic of the new bell-type air nozzle is measured. Furthermore, the causes of cover outlet abrasion and blockage, inner tube fracture, and irregular resistance change in traditional bell-type air nozzles applied in circulating fluidized bed (CFB) boilers are analyzed. Then, the performance of the new bell-type air nozzle is evaluated in a real CFB boiler, which is operated under regular working conditions. The results show that the new bell-type air nozzle has stronger anti-wear ability, excellent resistance characteristics, longer service life, and easier maintenance.

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Spanu, Simone, David Mosna, and Giuseppe Vignali. "CFD Analysis of Coffee Packaging in Capsules using Gas Flushing Modified Atmosphere Packaging." International Journal of Food Engineering 12, no. 9 (November 1, 2016): 875–87. http://dx.doi.org/10.1515/ijfe-2016-0047.

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Abstract The aim of this work is to analyze, by means of CFD (Computational Fluid Dynamics), the gas flow in a packaging machine used to fill polymeric capsules with coffee. The final goal is to optimize the geometric shape of some mechanical components in the machine’s sealing station in order to reduce the inert gas consumption achieving an O2 residual which is constantly equal or below 1 % by mass in the center of the capsule. The fluid domain has been obtained starting from the 3D CAD model of the sealing station of the packaging machine. The CAD software SolidWorks has been used to design the system, while Ansys CFX 14.5 software has been used for the CFD analysis. The CFD model has been validated by comparing its results with those obtained by experimental tests. The modified solution allows reducing the average O2 residual from about 3 % to less than 1 %.

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Lin, Chen-Jiann, Tseng-Hsiang Tse, Liu-Cheng Che, and Liang-Ming Tsai. "Computer aided design and analysis on distributors in DAC columns." MATEC Web of Conferences 185 (2018): 00024. http://dx.doi.org/10.1051/matecconf/201818500024.

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Dynamic axial compression (DAC) columns are key elements in simulated moving bed, which is a chromatography process in drug industry and chemical engineering. In this study, rules for designing distributors are proposed based on mass conservation and validated by experiments, the computer aided design (CAD) and the computational fluid dynamics (CFD). Experimental works are conducted to choose feasible numerical parameters for simulations. In CFD, the transient laminar flow fields are governed by the momentum and species transport equations with Darcy's law to model the porous zone in the packed bed. Results show that CFD combined with CAD solid modelling is a good approach to explore detailed flow fields in DAC columns and carry out parameter analysis for innovative designs. For further testing and evaluation, a new model of compound distributor is designed, 3D printed and processed in factory for practical applications in preparative chromatography.

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AlizadehAttar, Alireza, Mojtaba Pourmahdian, and Baghar Anvaripour. "Experimental Study and CFD Simulation of Pool Fires." International Journal of Computer Applications 70, no. 11 (May 17, 2013): 9–15. http://dx.doi.org/10.5120/12004-5790.

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Bilhan, Omer, M. Cihan Aydin, M. Emin Emiroglu, and Carol J. Miller. "Experimental and CFD Analysis of Circular Labyrinth Weirs." Journal of Irrigation and Drainage Engineering 144, no. 6 (June 2018): 04018007. http://dx.doi.org/10.1061/(asce)ir.1943-4774.0001301.

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Bhaskar, K. Udaya, Y. Rama Murthy, M. Ravi Raju, Sumit Tiwari, J. K. Srivastava, and N. Ramakrishnan. "CFD simulation and experimental validation studies on hydrocyclone." Minerals Engineering 20, no. 1 (January 2007): 60–71. http://dx.doi.org/10.1016/j.mineng.2006.04.012.

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Mansouri, A., H. Arabnejad, S. A. Shirazi, and B. S. McLaury. "A combined CFD/experimental methodology for erosion prediction." Wear 332-333 (May 2015): 1090–97. http://dx.doi.org/10.1016/j.wear.2014.11.025.

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Yamaguchi, Masashi, Makoto Tsuruta, and Kenshiro Kato. "Experimental and CFD Analysis of Tire Cooling Sidewall." SAE International Journal of Passenger Cars - Mechanical Systems 1, no. 1 (April 14, 2008): 1–8. http://dx.doi.org/10.4271/2008-01-0148.

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Hasib, Raunaq, Rajiv Kumar, Shashi, and Surendra Kumar. "Simulation of an experimental compartment fire by CFD." Building and Environment 42, no. 9 (September 2007): 3149–60. http://dx.doi.org/10.1016/j.buildenv.2006.08.002.

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Bérard, Ariane, Gregory S. Patience, and Bruno Blais. "Experimental methods in chemical engineering: Unresolved CFD‐DEM." Canadian Journal of Chemical Engineering 98, no. 2 (January 10, 2020): 424–40. http://dx.doi.org/10.1002/cjce.23686.

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Aguilar, Raúl Román, Julio Valle Hernández, Gilberto Pérez Lechuga, and Jorge I. Hernández Gutiérrez. "CFD Analysis of an Ejector Operating in an Experimental Cooling System." International Journal of Materials, Mechanics and Manufacturing 8, no. 1 (February 2020): 1–4. http://dx.doi.org/10.18178/ijmmm.2020.8.1.474.

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Alnsrawy, Najeeb Fadhil, and Sadiq S. Muhsun. "Computational and Experimental Simulation of Pollutant Transport through Multiple Porous Media." Key Engineering Materials 938 (December 26, 2022): 141–49. http://dx.doi.org/10.4028/p-6dj5k5.

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The huge industrial development that has taken place in recent decades and what it poses of large amounts of pollutants to the soil and the natural processes that occur in the migration of some pollutants such as oil and others in the soil have become one of the biggest pollution problems and thus the problem of obtaining information to find solutions has become more complex. This research was carried out to develop a CFD simulation model for simulating the transmission of contaminants via soil's multi-porous medium Consisting of four real porous media were used from Iraqi soil, representing the sand, sandy gravel, organic, and calcareous soil. To explore the process of transferring pollutants inside the porous medium, a physical model and simulation model were built and executed with the aid of CFD programs using COMSOL 5.4 software to investigate the transport of pollutants via porous material. Several categories of variables were studied and assumed to analyze the situation. The first group is interested in the media's physical qualities, such as the coefficient of adoption Kd while the hydraulic component of flow, such as velocity, was represented by the second group. To adopt the CFD simulated model in obtaining the required results, it is necessary to check the results of the CFD simulated model with its counterparts obtained from the physical model that was prepared for this purpose. Therefore, according to numerous statistical indicators, the results of the laboratory work supplied by the physical model and those of the CFD model were in excellent accord. This suggests that CFD models might be a useful tool for simulating the complicated challenges of contaminant transport across porous media. It is also considered a tool with effort, time, and low cost. So, based on the CFD models, the results revealed that the coefficient of adsorption (Kd) action has a noticeable influence on soil physical characteristics. While the results confirmed that the effect of the speed coefficient was small compared with the effect of(kd).

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Gudi, Abhay, and Vijaykumar Hindasageri. "Experimental and Numerical Heat Transfer Study of Swirling Air Jet Impingement." International Journal of Heat and Technology 40, no. 4 (August 31, 2022): 1001–12. http://dx.doi.org/10.18280/ijht.400418.

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Experimental and numerical study has been performed to study effect of swirl on heat transfer. A twisted swirl tape with twist ratio (T. R)=2 is used to generate swirl and effect of parameters like z/d=2 to 8 and Re varying between 3000 to 9000 are studied experimentally. Experiments show heat transfer dependency on Reynolds number. This study is further extended numerically using commercial CFD code ANSYS Fluent for much higher Reynolds number flow up to 20000. It is seen that CFD centerline peak Nu profile matches pretty well with experiments conducted. A relation between peak Nu and Re is established numerically for the conditions mentioned above. Further, effect of multiple swirl jet impingement (two jets separated by distance 1.5D, 2D and 3D) on Peak Nu is explained through CFD studies. CFD results show that jet distance of 1.5D is more effective in achieving higher heat transfer compared to 2D and 3D distances.

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Tapia, Elvira, Aurelio González-Pardo, Alfredo Iranzo, Manuel Romero, José González-Aguilar, Alfonso Vidal, Mariana Martín-Betancourt, and Felipe Rosa. "Multi-Tubular Reactor for Hydrogen Production: CFD Thermal Design and Experimental Testing." Processes 7, no. 1 (January 11, 2019): 31. http://dx.doi.org/10.3390/pr7010031.

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This study presents the Computational Fluid Dynamics (CFD) thermal design and experimental tests results for a multi-tubular solar reactor for hydrogen production based on the ferrite thermochemical cycle in a pilot plant in the Plataforma Solar de Almería (PSA). The methodology followed for the solar reactor design is described, as well as the experimental tests carried out during the testing campaign and characterization of the reactor. The CFD model developed for the thermal design of the solar reactor has been validated against the experimental measurements, with a temperature error ranging from 1% to around 10% depending on the location within the reactor. The thermal balance in the reactor (cavity and tubes) has been also solved by the CFD model, showing a 7.9% thermal efficiency of the reactor. CFD results also show the percentage of reacting media inside the tubes which achieve the required temperature for the endothermic reaction process, with 90% of the ferrite pellets inside the tubes above the required temperature of 900 °C. The multi-tubular solar reactor designed with aid of CFD modelling and simulations has been built and operated successfully.

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Xiong, Xuan, Xiao Ming Ye, and Kai Wang. "An Experimental Flow Study of the Pitching Oscillating Airfoil Using the PIV Technique." Applied Mechanics and Materials 733 (February 2015): 562–65. http://dx.doi.org/10.4028/www.scientific.net/amm.733.562.

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A wind tunnel experiment is carried out employing 2D-PIV technique to visualize the qualitative flow field and to obtain the quantitative velocity profile respectively in the wake of 1 Hz pitching oscillating airfoil of 6 degrees amplitude. In order to validate the experiment for future’s study, the experimental velocity data are compared to relative CFD ones. The CFD results are obtained from a code called Map Flow that is able to deal with the flow around pitching and plunging oscillating airfoil. From the vortices maps it is shown that the experimental results and CFD ones are well compared with respect to the size and the shape of the vortices patterns. Quantitatively, the differences between experiment and CFD with respect to the velocity profile are acceptable.

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Sun, Shuaihui, Gursharanjit Singh, Ahmed Kovacevic, and Christoph Bruecker. "Experimental and Numerical Investigation of Tip Leakage Flows in a Roots Blower." Designs 4, no. 1 (February 6, 2020): 3. http://dx.doi.org/10.3390/designs4010003.

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Computational fluid dynamics (CFD) can help in understanding the nature of leakage flow phenomena inside the rotary positive displacement machines (PDMs). However, due to the lack of experimental results, the analysis of leakage flows in rotary PDMs by CFD has not yet been fully validated. Particle image velocimetry (PIV) tests with a microscopic lens and phase-lock were conducted to obtain the velocity field around the tip gap in an optical Roots blower. The three-dimensional unsteady CFD model of the Roots blower with the dynamic grids generated by Screw Compressor Rotor Grid Generation (SCORG) was established to predict the gap flow under the same operating conditions. The images obtained by the PIV tests were analyzed and some factors which compromise the quality of test results in the gap flow were identified, such as reflections and transparency of the window. The flow fields obtained by CFD have the same flow pattern and velocity magnitude as the experimental results in the majority of observed regions but overestimate the leakage flow velocity. The CFD results show a vortex induced by the leakage flow in the downstream region of the gap. The flow losses in the tip gap mainly happen at the entrance upstream of the gap. Finally, some suggestions for future work are discussed.

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Zhao, Jian Zhu, Qing Miao Liu, Feng Chen Wang, Mei Yuan, and Shao Jiong Huang. "Experimental Study on Stirring Wind-Heating Devices." Advanced Materials Research 953-954 (June 2014): 419–23. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.419.

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To improve the using efficiency of clean energy, in this investigation, three wind-heating devices, nonlayered-stirring heating device, layered-stirring heating device and layered extruded stirring heating device, were designed, fabricated and tested. The performance of these three devices was investigated experimentally. Results show that, under the experimental conditions, the layered extruded stirring heating device is the most efficient, and its heating efficiency reaches 46.4%. Then, the computational fluid dynamics (CFD) models were established base on these three devices. The comparative analysis of the simulation and experimental results, both obtained consistent heating law. This suggests that the use of the software CFD simulating the stirring heating device is feasible.

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Chawner, J. R., G. S. Spragle, and R. J. Matus. "Calibration of CFD Methods for High Mach Number Aeroengine Flowfields." Journal of Engineering for Gas Turbines and Power 111, no. 1 (January 1, 1989): 24–30. http://dx.doi.org/10.1115/1.3240223.

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The design and analysis of scramjet engines relies heavily on the use of Computational Fluid Dynamics (CFD) methods due to the lack of experimental facilities and engineering analysis techniques for high Mach number, high-temperature flows. This emphasis on CFD requires that the methods be calibrated through comparison with existing experimental data to determine their level of capability and range of applicability. At General Dynamics’ Fort Worth Division a level of confidence has been established in the use of CFD methods for scramjet flowfields. These methods include a Beam-Warming-based Unsteady Navier-Stokes (UNS) solver, a Beam-Warming-based Parabolized Navier-Stokes (PNS) solver, and a MacCormack-based PNS solver. Specifically, comparisons between CFD flowfields and experimental data for a blunt cone at Mach 10.6, an inlet at Mach 7.4, a combustor at Mach 2.4, and an axisymmetric plug nozzle at Mach 3.2 have been made. These calibrations show good overall agreement for wall pressures, integrated forces, and pressure, Mach number, and chemical species profiles. Examination of the disparities between the CFD and experimental results focuses concern on the treatment of boundary layer turbulence and finite rate chemistry. As a result, further developmental tasks are suggested, which, when complete, will further enhance the applicability of the subject CFD methods.

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Hrabovský, Peter, Zuzana Kolková, Marián Mokrý, and Patrik Nemec. "Basic CFD model of heat pipe." MATEC Web of Conferences 168 (2018): 02014. http://dx.doi.org/10.1051/matecconf/201816802014.

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The article deals with the creation of the basis of the CFD model of the heat pipe, which is designed to simulate and show the predicted course of the work-fluid-activity within the heat pipe. This simulation is part of the study of the heat pipe device. This device, based on CFD simulation, can be constructed to describe the phenomena running inside the heat pipe based on real-world experimental measurements. A comparison of the CFD and the experimental model can explain the problems of areas and phenomena in the heat pipe. Based on this comparison, it is possible to optimize single device errors. The optimization transferred to the CFD model will show us how to solve problems and how to improve the experimental models of heat pipes.

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V., Aftaniuk. "Analysis of gas flows in ships turbines." Scientific Bulletin of Naval Academy XXII, no. 1 (July 15, 2019): 318–22. http://dx.doi.org/10.21279/1454-864x-19-i1-046.

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In this paper comparison was made of an experimental study of gas flows and CFD simulation of turbine blades steam turbines for ships. For CFD simulation develop solid models, samples were taken from three blades similarly studied in the experiment. An analysis of experimental data and CFD simulation results of the gas flow near lattice the considered type shows the inappropriateness of their application at supersonic speeds. The calculations performed on the CFD model show that the use of CFD modelling methods allows, at the early stages of designing turbine blades, to select the most optimal (in terms of energy losses) forms of profiles for specific modes of operation of the ship's turbine. Further improvement of the profiles that have passed the preliminary calculation check is advisable to conduct on the basis of more detailed experimental tests to obtain dependences of losses in the lattice, the exit angle of the flow from the parameters of the lattice and the angle of gas flow.

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Cheng, Chin-Hsiang, and Duc-Thuan Phung. "Modeling of Thermal-Lag Engine with Validation by Experimental Data." Energies 15, no. 20 (October 18, 2022): 7688. http://dx.doi.org/10.3390/en15207688.

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Thermal-lag engines are external combustion engines with a single moving piston. This feature leads to lower manufacturing and maintenance costs than traditional Stirling engines. Although the original concept of thermal-lag engines was invented roughly 35 years ago, the information on thermal-lag engines is still limited. Therefore, this study focuses on thermal-lag engine performance by developing a three-dimensional computational fluid dynamics (CFD) model. The grid independence check and the time step independence check are firstly performed to select the number of elements and size of the time step for simulation. The CFD model is then validated by the experimental data, which were collected by measuring an existing prototype engine. It has been found that the CFD predictions are well fitted to the experimental data over the range of engine speed from 200 to 1600 rpm at temperatures of 1173 or 1273 K. Furthermore, the CFD model predicts that the maximum engine power is 21.1 W while the prototype engine practically generates the highest power of 22.35 W at 1000 rpm and 1273 K. Finally, a further parametric study shows that crank radius, piston diameter, working gas mass, working gas species, and heating temperature significantly affect engine power.

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Lu, Wei, Yiwen Hu, Shenghan Zhou, Xin Zhang, Quan Yuan, Xiaoting Zhou, Houcheng Liu, et al. "Experimental verification of a CFD model for the closed plant factory under artificial lighting." E3S Web of Conferences 213 (2020): 03013. http://dx.doi.org/10.1051/e3sconf/202021303013.

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A computational fluid dynamics (CFD) model for the closed plant factory under artificial lighting has been developed in this study, the experimental verification of CFD model with the air velocity value was compared with the measured air temperature value. The results showed that the mean relative error of validation with the air velocity was 15%, and comparable with experimentally observed air temperature profile inside the plant factory with RMSE of 3% which show the utility of CFD to study plant factory microclimatic parameters.

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Mahmood, Raid Ahmed. "CFD Assessment and Experimental Investigation of the Liquid Separation Efficiency Enhancements in a Vertical Gravity Separator." International Journal of Air-Conditioning and Refrigeration 28, no. 03 (August 8, 2020): 2050021. http://dx.doi.org/10.1142/s2010132520500212.

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Three design enhancement options for a vertical gravitational flash tank separator were proposed and investigated in this work. Computational Fluid Dynamic (CFD) was used to assess the optimum configurations of the vertical gravitational flash tank separator. A series of experiments were performed to test the CFD proposed configurations of the enhancement design options. This paper also assessed the usefulness of CFD in flash tank design, and this is achieved through experiments and simulations on a range of relevant configurations using water as the working fluid. The results revealed that the combination of the inlet flow direction and extractor had a significant effect on the performance of the vertical flash tank separator which increased by 2%. The results also revealed that there was a good agreement between the CFD simulations and experiments; the CFD simulations underestimated the liquid separation efficiency by approximately 0.02 over the range of conditions tested.

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Wu, Jinming, Yingxue Yao, Dongke Sun, Zhonghua Ni, and Malin Göteman. "Numerical and Experimental Study of the Solo Duck Wave Energy Converter." Energies 12, no. 10 (May 21, 2019): 1941. http://dx.doi.org/10.3390/en12101941.

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The Edinburgh Duck is one of the highly-efficient wave energy converters (WECs). Compared to the spine-connected Duck configuration, the solo Duck will be able to use the point absorber effect to enhance its power capture performance. In this paper, a 3D computational fluid dynamic (CFD) model is developed to predict the hydrodynamic performance of the solo Duck WEC in regular waveswithin a wide range ofwave steepness until the Duck capsizes. A set of experiments was designed to validate the accuracy of the CFD model. Boundary element method (BEM) simulations are also performed for comparison. CFD results agree well with experimental results and the main difference comes from the friction in the mechanical transmission system. CFD results also agree well with BEM results and differences appear at large wave steepness as a result of two hydrodynamic nonlinear factors: the nonlinear waveform and the vortex generation process. The influence of both two nonlinear factors iscombined to be quantitatively represented by the drag torque coefficient.The vortex generation process is found to cause a rapid drop of the pressure force due to the vortexes taking away the kinetic energy from the fluid.

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Hoi, Yiemeng, Scott H. Woodward, Minsuok Kim, Dale B. Taulbee, and Hui Meng. "Validation of CFD Simulations of Cerebral Aneurysms With Implication of Geometric Variations." Journal of Biomechanical Engineering 128, no. 6 (June 15, 2006): 844–51. http://dx.doi.org/10.1115/1.2354209.

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Background. Computational fluid dynamics (CFD) simulations using medical-image-based anatomical vascular geometry are now gaining clinical relevance. This study aimed at validating the CFD methodology for studying cerebral aneurysms by using particle image velocimetry (PIV) measurements, with a focus on the effects of small geometric variations in aneurysm models on the flow dynamics obtained with CFD. Method of Approach. An experimental phantom was fabricated out of silicone elastomer to best mimic a spherical aneurysm model. PIV measurements were obtained from the phantom and compared with the CFD results from an ideal spherical aneurysm model (S1). These measurements were also compared with CFD results, based on the geometry reconstructed from three-dimensional images of the experimental phantom. We further performed CFD analysis on two geometric variations, S2 and S3, of the phantom to investigate the effects of small geometric variations on the aneurysmal flow field. Results. We found poor agreement between the CFD results from the ideal spherical aneurysm model and the PIV measurements from the phantom, including inconsistent secondary flow patterns. The CFD results based on the actual phantom geometry, however, matched well with the PIV measurements. CFD of models S2 and S3 produced qualitatively similar flow fields to that of the phantom but quantitatively significant changes in key hemodynamic parameters such as vorticity, positive circulation, and wall shear stress. Conclusion. CFD simulation results can closely match experimental measurements as long as both are performed on the same model geometry. Small geometric variations on the aneurysm model can significantly alter the flow-field and key hemodynamic parameters. Since medical images are subjected to geometric uncertainties, image-based patient-specific CFD results must be carefully scrutinized before providing clinical feedback.

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Luan, Yigang, and Haiou Sun. "Experimental and Numerical Study on the Resistance Performance of an Axial Flow Cyclone Separator." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/384524.

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The purpose of this paper is to study the pressure drop of an axial flow cyclone separator as a function of inlet velocities using experimental and computational fluid dynamics (CFD) methods. First, the resistance performance of the separator was acquired under ambient pressure and temperature with little change by wind tunnel experiments. Then, numerical simulations were carried out in CFD code Fluent 6.3 under standard operating conditions. A comparison between the experimental and CFD data demonstrates that the CFD method can predict the pressure drop of the axial cyclone separator excellently. Additionally, the results show that the axial flow cyclone separators have a pressure drop coefficient of approximately 7.5. To study the effect of ambient pressure and temperature on pressure drops, the same CFD method was employed to predict the resistance performance under various operating conditions. Then the numerical results were compared with the data of a normalization process method of pressure drops raised in this paper. Their comparison demonstrated that the normalization method had a high precision in predicting the influence of ambient operating parameters on pressure drops of an axial flow cyclone separator.

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Barber, T. J., G. Doig, C. Beves, I. Watson, and S. Diasinos. "Synergistic integration of computational fluid dynamics and experimental fluid dynamics for ground effect aerodynamics studies." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 226, no. 6 (June 2012): 602–19. http://dx.doi.org/10.1177/0954410011414321.

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This article highlights the ‘synergistic’ use of experimental fluid dynamics (EFD) and computational fluid dynamics (CFD), where the two sets of simulations are performed concurrently and by the same researcher. In particular, examples from the area of ground effect aerodynamics are discussed, where the major facility used was also designed through a combination of CFD and EFD. Three examples are than outlined, to demonstrate the insight that can be obtained from the integration of CFD and EFD studies. The case studies are the study of dimple flow (to enhance aerodynamic performance), the analysis of a Formula-style front wing and wheel, and the study of compressible flow ground effect aerodynamics. In many instances, CFD has been used to not only provide complementary information to an experimental study, but to design the experiments. Laser-based, non-intrusive experimental techniques were used to provide an excellent complement to CFD. The large datasets found from both experimental and numerical simulations have required a new methodology to correlate the information; a new post-processing method has been developed, making use of the kriging and co-kriging estimators, to develop correlations between the often disparate data types.

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Saddington, A. J., N. J. Lawson, and K. Knowles. "An experimental and numerical investigation of under-expanded turbulent jets." Aeronautical Journal 108, no. 1081 (March 2004): 145–52. http://dx.doi.org/10.1017/s0001924000151590.

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AbstractThe work described here concentrates on under-expanded, axisym-metric turbulent jets issuing into quiescent conditions. Under-expanded turbulent jets are applicable to most aircraft propulsion applications that use convergent nozzles. Experimental studies used laser doppler velocimetry (LDV) and pitot probe measurements along the jet centreline. These measurements were made for two nozzle pressure ratios (2·5 and 4·0) and at various streamwise positions up to 10 nozzle diameters downstream of the nozzle exit plane. A computational fluid dynamics (CFD) model was developed using the Fluent code and utilised the RNG K-ε two-equation turbulence model. A mesh resolution of approximately one hundredth of nozzle exit diameter was found to be sufficient to establish a mesh independent solution.Comparison of the jet centreline axial velocity (LDV data) and pressure ratio (pitot probe data) showed good agreement with the CFD model. The correct number of shock cells had been predicted and the shock strength agreed well between the experiments and numerical model. The CFD model was, however, found to over-predict the shock cell length resulting in a longer supersonic core. There was some evidence, based on analysis of the LDV measurements that indicates the presence of swirl and jet unsteadiness, which could contribute to a shortening of the shock cell length. These effects were not modelled in the CFD. Correlation between the LDV and pitot probe measurements was generally good, however, there was some evidence that probe interference may have caused the premature decay of the jet. Overall, this work has indicated the good agreement between a CFD simulation using the RNG k-ε turbulence model and experimental data when applied to the prediction of the flowfield generated by under-expanded turbulent jets. The suitability of the LDV technique to jet flows with velocities up to 500ms-1has also been demonstrated.

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Saddington, A. J., N. J. Lawson, and K. Knowles. "An experimental and numerical investigation of under-expanded turbulent jets." Aeronautical Journal 108, no. 1081 (March 2004): 145–52. http://dx.doi.org/10.1017/s0001924000000051.

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AbstractThe work described here concentrates on under-expanded, axisym-metric turbulent jets issuing into quiescent conditions. Under-expanded turbulent jets are applicable to most aircraft propulsion applications that use convergent nozzles. Experimental studies used laser doppler velocimetry (LDV) and pitot probe measurements along the jet centreline. These measurements were made for two nozzle pressure ratios (2·5 and 4·0) and at various streamwise positions up to 10 nozzle diameters downstream of the nozzle exit plane. A computational fluid dynamics (CFD) model was developed using the Fluent code and utilised the RNG K-ε two-equation turbulence model. A mesh resolution of approximately one hundredth of nozzle exit diameter was found to be sufficient to establish a mesh independent solution.Comparison of the jet centreline axial velocity (LDV data) and pressure ratio (pitot probe data) showed good agreement with the CFD model. The correct number of shock cells had been predicted and the shock strength agreed well between the experiments and numerical model. The CFD model was, however, found to over-predict the shock cell length resulting in a longer supersonic core. There was some evidence, based on analysis of the LDV measurements that indicates the presence of swirl and jet unsteadiness, which could contribute to a shortening of the shock cell length. These effects were not modelled in the CFD. Correlation between the LDV and pitot probe measurements was generally good, however, there was some evidence that probe interference may have caused the premature decay of the jet. Overall, this work has indicated the good agreement between a CFD simulation using the RNG k-ε turbulence model and experimental data when applied to the prediction of the flowfield generated by under-expanded turbulent jets. The suitability of the LDV technique to jet flows with velocities up to 500ms-1has also been demonstrated.

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Munisamy, Kannan M., Ramies Govindasamy, and Savithry K. Thangaraju. "Experimental and Numerical Investigation onto 1250mm Axial Fan." Applied Mechanics and Materials 225 (November 2012): 91–96. http://dx.doi.org/10.4028/www.scientific.net/amm.225.91.

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Numerical simulation is of interest for most fan designers to optimize the fan designs. Computational fluid dynamic (CFD) has become an essential tool in almost every branch of fluid dynamics and one of the major tools for fan designs. As the fan designers relying on the numerical simulation, the accuracy of tools such as CFD in predicting the performance has become a subject of interest. This paper validates the CFD modeling of an axial fan design against experimental result. The experimental rig and test procedure are developed with reference to “AMCA standard 210”. The analysis is conducted on 1250mm diameter axial fan with two different blade pitch angle 30° and 40°. Prior to encounter the swirling effect and deflection of velocity vector due to rotor blade, a stator blade with the same profile as rotor blade is used as the outlet guide vanes in opposite direction. The computational model is created according to the experimental condition and applied realistic boundary conditions. The model is simulated using commercial CFD package, ANSYS FLUENT. The results obtained are compared against experimental data (AMCA standard 210) over wide range of flow rate. Provided the modeling strategy is chosen appropriately with correct configuration of mesh density and turbulent model then, the results correlates closely with experimental data. This is shown in this investigation. The guide vane incidence angle determination is also done in this paper for 30° and 40° blade pitch angle. The outcome of this paper would provide confidence for designers in numerical simulation for predicting performance of axial fan. In addition, numerical simulation creates a platform for systems to be optimized with a lower cost and high efficiency outcomes.

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Park, Donggeun, and Jong-Hyeon Lee. "Feasibility Evaluation of Computational Fluid Dynamics Approach for Inhalation Exposure Assessment: Case Study for Biocide Spray." Applied Sciences 11, no. 2 (January 11, 2021): 634. http://dx.doi.org/10.3390/app11020634.

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Consumer products contain chemical substances that threaten human health. The zero-dimensional modeling methods and experimental methods have been used to estimate the inhalation exposure concentration of consumer products. The model and measurement methods have a spatial property problem and time/cost-consuming problem, respectively. For solving the problems due to the conventional methodology, this study investigated the feasibility of applying computational fluid dynamics (CFD) for the evaluation of inhalation exposure by comparing the experiment results and the zero-dimensional results with CFD results. To calculate the aerosol concentration, the CFD was performed by combined the 3D Reynolds averaged Navier–Stokes equations and a discrete phased model using ANSYS FLUENT. As a result of comparing the three methodologies performed under the same simulation/experimental conditions, we found that the zero-dimensional spray model shows an approximately five times underestimated inhalation exposure concentration when compared with the CFD results and measurement results in near field. Additionally, the results of the measured concentration of aerosols at five locations and the CFD results at the same location were compared to show the possibility of evaluating inhalation exposure at various locations using CFD instead of the experimental method. The CFD results according to measurement positions can rationally predict the measurement results with low error. In conclusion, in the field of exposure science, a guideline for exposure evaluation using CFD, was found that complements the shortcomings of the conventional methodology, the zero-dimensional spray model and measurement method.

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Park, Donggeun, and Jong-Hyeon Lee. "Feasibility Evaluation of Computational Fluid Dynamics Approach for Inhalation Exposure Assessment: Case Study for Biocide Spray." Applied Sciences 11, no. 2 (January 11, 2021): 634. http://dx.doi.org/10.3390/app11020634.

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Consumer products contain chemical substances that threaten human health. The zero-dimensional modeling methods and experimental methods have been used to estimate the inhalation exposure concentration of consumer products. The model and measurement methods have a spatial property problem and time/cost-consuming problem, respectively. For solving the problems due to the conventional methodology, this study investigated the feasibility of applying computational fluid dynamics (CFD) for the evaluation of inhalation exposure by comparing the experiment results and the zero-dimensional results with CFD results. To calculate the aerosol concentration, the CFD was performed by combined the 3D Reynolds averaged Navier–Stokes equations and a discrete phased model using ANSYS FLUENT. As a result of comparing the three methodologies performed under the same simulation/experimental conditions, we found that the zero-dimensional spray model shows an approximately five times underestimated inhalation exposure concentration when compared with the CFD results and measurement results in near field. Additionally, the results of the measured concentration of aerosols at five locations and the CFD results at the same location were compared to show the possibility of evaluating inhalation exposure at various locations using CFD instead of the experimental method. The CFD results according to measurement positions can rationally predict the measurement results with low error. In conclusion, in the field of exposure science, a guideline for exposure evaluation using CFD, was found that complements the shortcomings of the conventional methodology, the zero-dimensional spray model and measurement method.

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Huang, Min, You Long Wang, Shi Feng Xiong, and Yao Kang. "Structural Optimization of Double Swirler Based on Experimental Design." Applied Mechanics and Materials 411-414 (September 2013): 2997–3005. http://dx.doi.org/10.4028/www.scientific.net/amm.411-414.2997.

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Based on several structure optimization parameters for the description of the geometric features of a double oblique radial swirler, simplified structure design parameters and value interval were determined. And, the CFD analysis model of the swirler is established. Based on the approaches of multi-wheel space filling experimental designs, 17 design schemes were gained, then CFD numberical experiments on the cold single-phase flow field was developed to all design schemes. Finally, the optimal design scheme were found by numberical space filling experimental design method in a several turn.

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Jimenez-Garcia, A., G. N. Barakos, and S. Gates. "Tiltrotor CFD Part I - validation." Aeronautical Journal 121, no. 1239 (May 2017): 577–610. http://dx.doi.org/10.1017/aer.2017.17.

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ABSTRACTThis paper presents performance analyses of the model-scale ERICA and TILTAERO tiltrotors and of the full-scale XV-15 rotor with high-fidelity computational fluids dynamics. For the ERICA tiltrotor, the overall effect of the blades on the fuselage was well captured, as demonstrated by analysing surface pressure measurements. However, there was no available experimental data for the blade aerodynamic loads. A comparison of computed rotor loads with experiments was instead possible for the XV-15 rotor, where CFD results predicted the FoM within 1.05%. The method was also able to capture the differences in performance between hover and propeller modes. Good agreement was also found for the TILTAERO loads. The overall agreement with the experimental data and theory for the considered cases demonstrates the capability of the present CFD method to accurately predict tiltrotor flows. In a second part of this work, the validated method is used for blade shape optimisation.

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Rocha, Sandra Mara Santana, M. S. Bacelos, João Jorge Ribeiro Damasceno, L. G. M. Vieira, and M. L. Aguiar. "The Effect of the Dust Cake Resistance on Fluid Flow Passing through the Filter Media." Materials Science Forum 727-728 (August 2012): 758–63. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.758.

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A filter box was used to obtain the experimental data of filtration operation with different air velocities as 5, 10 and 15 cm/s. The experimental data were compared to the simulated ones using CFD technique. For all range of air velocity and dust cake porosity and permeability employed, data of pressure drop in filter box could be satisfactorily predicted by simulations in CFD. Furthermore, the CFD simulations showed that undesirable patchy cleaning might be overcome using air velocities lower than 15cm/s.

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Mori, G., S. Razore, M. Ubaldi, and P. Zunino. "Integrated Experimental and Numerical Approach for Fuel-Air Mixing Prediction in a Heavy-Duty Gas Turbine LP Burner." Journal of Engineering for Gas Turbines and Power 123, no. 4 (October 1, 2000): 803–9. http://dx.doi.org/10.1115/1.1378297.

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An integrated experimental-numerical procedure has been developed for fuel-air mixing prediction in a heavy-duty gas turbine burner. Optical measurements of the degree of mixing have been performed in a full-scale test rig operating with cold flow. Experimental data have been utilized to validate a CFD RANS numerical model. In fact, it is recognized that the turbulence behavior of jets in swirling air-flow stream is not accurately described by standard k-ε turbulence models; therefore advanced turbulence models have been assessed by means of experimental data. The degree of mixing between simulated fuel and air streams has been evaluated at the burner exit section by means of a planar Mie scattering technique. The experimental apparatus consists of a pulsed Nd:YAG laser and a high resolution CCD video camera connected to a frame grabber. The acquired instantaneous images have been processed through specific procedures that also take into account the laser beam spatial nonuniformity. A second-order discretization scheme with a RSM turbulence model gives the best accordance with the experimental data. Such CFD model will be part of a more general method addressed to numerical prediction of turbulent combustion flames in LP technology.

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Journal articles on the topic 'CFD experimental'

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