Artykuły w czasopismach: „Loosely coupled fluid-structure interaction model”

1

Sackmann, E. "Molecular and global structure and dynamics of membranes and lipid bilayers". Canadian Journal of Physics 68, nr 9 (1.09.1990): 999–1012. http://dx.doi.org/10.1139/p90-142.

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The cell plasma is a composite type of material that is made up of a two-dimensional liquid crystal (lipid–protein bilayer) to which a macromolecular network (the cytoskeleton) is loosely coupled. The latter may be approximately two dimensional as in the case of the erythrocytes or may extend throughout the whole cell cytoplasm. Owing to this combination of two states of matter, the membrane combines the dynamics and flexibility of a fluid with the mechanical stability of a solid. Owing to its low dimensionality, the local structure of the bilayer or the global shape of cells may be most effectively controlled and modulated by biochemical signals such as macromolecular adsorption. The present contribution deals with comparative studies of the local and global dynamic properties of biological and artificial membranes. In the first part the question of the physical basis of selective lipid–protein interaction mechanisms is addressed and the outstanding viscoelastic properties of plasma membranes and their role for local instabilities shape fluctuations of cells and the cell–substrate interaction are described. The second part deals with the molecular architecture and dynamics of composite membranes prepared by combining monomeric and macromolecular lipids. These model membranes open new possibilities to mimick complex mechanical processes of cell plasma membranes and to prepare low-dimensionality macromolecular solutions and gels. Finally, the use of such compound systems by nature to prepare the semipermeable protective layers of plant leaves, the so-called cuticle, is discussed. In analogy to plasma membranes, the local transport properties are modulated by variation of the liquid-crystalline state of the monomeric waxes.

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Maurice, Pauline, Neville Hogan i Dagmar Sternad. "Predictability, force, and (anti)resonance in complex object control". Journal of Neurophysiology 120, nr 2 (1.08.2018): 765–80. http://dx.doi.org/10.1152/jn.00918.2017.

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Manipulation of complex objects as in tool use is ubiquitous and has given humans an evolutionary advantage. This study examined the strategies humans choose when manipulating an object with underactuated internal dynamics, such as a cup of coffee. The dynamics of the object renders the temporal evolution complex, possibly even chaotic, and difficult to predict. A cart-and-pendulum model, loosely mimicking coffee sloshing in a cup, was implemented in a virtual environment with a haptic interface. Participants rhythmically manipulated the virtual cup containing a rolling ball; they could choose the oscillation frequency, whereas the amplitude was prescribed. Three hypotheses were tested: 1) humans decrease interaction forces between hand and object; 2) humans increase the predictability of the object dynamics; and 3) humans exploit the resonances of the coupled object-hand system. Analysis revealed that humans chose either a high-frequency strategy with antiphase cup-and-ball movements or a low-frequency strategy with in-phase cup-and-ball movements. Counter to hypothesis 1, they did not decrease interaction force; instead, they increased the predictability of the interaction dynamics, quantified by mutual information, supporting hypothesis 2. To address hypothesis 3, frequency analysis of the coupled hand-object system revealed two resonance frequencies separated by an antiresonance frequency. The low-frequency strategy exploited one resonance, whereas the high-frequency strategy afforded more choice, consistent with the frequency response of the coupled system; both strategies avoided the antiresonance. Hence, humans did not prioritize small interaction forces but rather strategies that rendered interactions predictable. These findings highlight that physical interactions with complex objects pose control challenges not present in unconstrained movements. NEW & NOTEWORTHY Daily actions involve manipulation of complex nonrigid objects, which present a challenge since humans have no direct control of the whole object. We used a virtual-reality experiment and simulations of a cart-and-pendulum system coupled to hand movements with impedance to analyze the manipulation of this underactuated object. We showed that participants developed strategies that increased the predictability of the object behavior by exploiting the resonance structure of the object but did not minimize the hand-object interaction force.

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Guidoboni, Giovanna, Roland Glowinski, Nicola Cavallini i Suncica Canic. "Stable loosely-coupled-type algorithm for fluid–structure interaction in blood flow". Journal of Computational Physics 228, nr 18 (październik 2009): 6916–37. http://dx.doi.org/10.1016/j.jcp.2009.06.007.

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Bukač, M. "A loosely-coupled scheme for the interaction between a fluid, elastic structure and poroelastic material". Journal of Computational Physics 313 (maj 2016): 377–99. http://dx.doi.org/10.1016/j.jcp.2016.02.051.

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Gigante, Giacomo, i Christian Vergara. "On the Choice of Interface Parameters in Robin–Robin Loosely Coupled Schemes for Fluid–Structure Interaction". Fluids 6, nr 6 (8.06.2021): 213. http://dx.doi.org/10.3390/fluids6060213.

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We consider two loosely coupled schemes for the solution of the fluid–structure interaction problem in the presence of large added mass effect. In particular, we introduce the Robin–Robin and Robin–Neumann explicit schemes where suitable interface conditions of Robin type are used. For the estimate of interface Robin parameters which guarantee stability of the numerical solution, we propose a new strategy based on the optimization of the reduction factor of the corresponding strongly coupled (implicit) scheme, by means of the optimized Schwarz method. To check the suitability of our proposals, we show numerical results both in an ideal cylindrical domain and in a real human carotid. Our results showed the effectiveness of our proposal for the calibration of interface parameters, which leads to stable results and shows how the explicit solution tends to the implicit one for decreasing values of the time discretization parameter.

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Benaroya, Haym, i Rene D. Gabbai. "Modelling vortex-induced fluid–structure interaction". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 366, nr 1868 (5.11.2007): 1231–74. http://dx.doi.org/10.1098/rsta.2007.2130.

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The principal goal of this research is developing physics-based, reduced-order, analytical models of nonlinear fluid–structure interactions associated with offshore structures. Our primary focus is to generalize the Hamilton's variational framework so that systems of flow-oscillator equations can be derived from first principles. This is an extension of earlier work that led to a single energy equation describing the fluid–structure interaction. It is demonstrated here that flow-oscillator models are a subclass of the general, physical-based framework. A flow-oscillator model is a reduced-order mechanical model, generally comprising two mechanical oscillators, one modelling the structural oscillation and the other a nonlinear oscillator representing the fluid behaviour coupled to the structural motion. Reduced-order analytical model development continues to be carried out using a Hamilton's principle-based variational approach. This provides flexibility in the long run for generalizing the modelling paradigm to complex, three-dimensional problems with multiple degrees of freedom, although such extension is very difficult. As both experimental and analytical capabilities advance, the critical research path to developing and implementing fluid–structure interaction models entails formulating generalized equations of motion, as a superset of the flow-oscillator models; and developing experimentally derived, semi-analytical functions to describe key terms in the governing equations of motion. The developed variational approach yields a system of governing equations. This will allow modelling of multiple d.f. systems. The extensions derived generalize the Hamilton's variational formulation for such problems. The Navier–Stokes equations are derived and coupled to the structural oscillator. This general model has been shown to be a superset of the flow-oscillator model. Based on different assumptions, one can derive a variety of flow-oscillator models.

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Gao, Hao, Liuyang Feng, Nan Qi, Colin Berry, Boyce E. Griffith i Xiaoyu Luo. "A coupled mitral valve—left ventricle model with fluid–structure interaction". Medical Engineering & Physics 47 (wrzesień 2017): 128–36. http://dx.doi.org/10.1016/j.medengphy.2017.06.042.

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PEGORARO, M., F. A. A. GOMES i P. R. NOVAK. "Study of modal analysis based on fluid-structure interaction". Revista IBRACON de Estruturas e Materiais 11, nr 6 (grudzień 2018): 1391–417. http://dx.doi.org/10.1590/s1983-41952018000600012.

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Abstract In this work, a coupled fluid-structure problem is approached, comparing the result with the modal analysis of a structure. The objective of this work is to analyze the physical phenomenon of fluid-structure interaction of a flexible structure. For this, the coupled problem solved using an Arbitrary Lagrangean-Eulerian (ALE) approach. As support for solving the mathematical equations of coupled problem, ANSYS® physical analysis software was used. An experimental modal analysis, using the Rational Fractional Polynomial method was developed for a small scale steel structure, and the result of this was compared with the result obtained from the model simulated in the software. Their vibration modes and natural frequencies obtained by numerical modeling were validated experimentally. Whit the numerical modeling of the modal analysis of a structure experimentally validated, attempted to analyze the dynamic behavior of the structure when it is subjected to a load due to a fluid-flow through a coupled fluid-structure problem. The results presented in this work show that the structure subjected to loads due to the fluid-flow, moves according to its vibration modes.

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Gigante, Giacomo, i Christian Vergara. "On the stability of a loosely-coupled scheme based on a Robin interface condition for fluid-structure interaction". Computers & Mathematics with Applications 96 (sierpień 2021): 109–19. http://dx.doi.org/10.1016/j.camwa.2021.05.012.

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Boilevin-Kayl, Ludovic, Miguel A. Fernández i Jean-Frédéric Gerbeau. "A Loosely Coupled Scheme for Fictitious Domain Approximations of Fluid-Structure Interaction Problems with Immersed Thin-Walled Structures". SIAM Journal on Scientific Computing 41, nr 2 (styczeń 2019): B351—B374. http://dx.doi.org/10.1137/18m1192779.

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Wilson, John T., Lowell T. Edgar, Saurabh Prabhakar, Marc Horner, Raoul van Loon i James E. Moore. "A fully coupled fluid-structure interaction model of the secondary lymphatic valve". Computer Methods in Biomechanics and Biomedical Engineering 21, nr 16 (6.11.2018): 813–23. http://dx.doi.org/10.1080/10255842.2018.1521964.

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Kalashnikova, I., M. F. Barone i M. R. Brake. "A stable Galerkin reduced order model for coupled fluid-structure interaction problems". International Journal for Numerical Methods in Engineering 95, nr 2 (3.06.2013): 121–44. http://dx.doi.org/10.1002/nme.4499.

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Tello, Alexis, i Ramon Codina. "Field‐to‐field coupled fluid structure interaction: A reduced order model study". International Journal for Numerical Methods in Engineering 122, nr 1 (31.10.2020): 53–81. http://dx.doi.org/10.1002/nme.6525.

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Jain, Prathik S. "2 Way Fluid-Structure Interaction Study of a Wing Structure". International Journal for Research in Applied Science and Engineering Technology 9, nr 8 (31.08.2021): 2593–606. http://dx.doi.org/10.22214/ijraset.2021.37834.

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Abstract: In this paper a scaled down model of a wing of rectangular planform is designed and the static analysis on the wing is carried out to determine the aerodynamics forces, stresses acting on it and the frequency of various modes. The iteration for the analysis is carried out for three materials namely, Aluminium 7075 T-6, Glass Fibre Reinforced Polymer and Aluminium Metal Matrix Composite. The analysis in the coupled mode is conducted and compared with the results obtained from that of static analysis to observe the changes in the flow pattern and how the structure behaves when the wing is considered to be flexible. In the coupled mode analysis 2 Way Fluid Structure Interaction analysis is carried out. The material properties and the results obtained from the analysis is compared to select the best out of the three materials. The change in the aerodynamic properties of the wing when it is considered to be flexible is also highlighted by a method of comparison. From the results obtained, it is observed that Aluminium Metal Matrix Composite has the least deformation for the same loading and can withstand higher stress. Hence, Aluminium Metal Matrix Composite exhibits better characteristics in comparison with Glass Fibre Reinforced Polymer and Aluminium 7075 T-6. Additionally, it is noticed that the aerodynamic properties of the wing is reduced when it is considered as a flexible structure. This can be highlighted by the 5.42% decrease in the L/D ratio between the CFD analysis and the 2 Way FSI analysis results. Keywords: Fluid Structure Interaction; Flexible Wing; CFD; Coupled Mode Analysis;

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Berger, Thomas, Michael Fischer i Klaus Strohmeier. "Fluid-Structure Interaction of Stirrers in Mixing Vessels". Journal of Pressure Vessel Technology 125, nr 4 (1.11.2003): 440–45. http://dx.doi.org/10.1115/1.1613951.

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Mixing stirrers are subject to severe damages when the rotational speed approaches the Eigenfrequency. Because of resonant vibrations, the stirrer deflection approaches infinity in the no damping case. Damping due to fluid-structure interaction between the mixing stirrer and the fluid in the vessel has major influence on the Eigenfrequency. Coupled analysis of the flow field within a mixing vessel and the structural dynamic response of the stirrer is necessary in order to evaluate vibrational amplitudes to guarantee life time safety for the stirrer. A simplified numerical model based on Newmark’s integration scheme is developed for the stirrer dynamics that is suitable to be implemented in a CFD code as a user subroutine. Results in terms of Eigenfrequencies are compared to results of analytical formulas and FEM results and show excellent agreement. The fully fluid-structure coupled analysis is also presented. As a new aspect, a rotating grid (sliding mesh) was combined with a deformable grid to simulate the impeller movement. The results are compared to experimental and analytical data and show good agreement.

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Chiappini, Daniele. "Fluid Structure Interaction of 2D Objects through a Coupled KBC-Free Surface Model". Water 12, nr 4 (24.04.2020): 1212. http://dx.doi.org/10.3390/w12041212.

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In this study, the capabilities of a coupled KBC-free surface model to deal with fluid solid interactions with the slamming of rigid obstacles in a calm water tank were analyzed. The results were firstly validated with experimental and numerical data available in literature and, thereafter, some additional analyses was carried out to understand the main parameters’ influence on slamming coefficient. The effect of grid resolution and Reynolds number were firstly considered to choose the proper grid and to present the weak impact of such a non-dimensional number on process evolution. Hence, the influence of Froude number on fluid-dynamics quantities was pointed out considering vertical impacts of both cylindrical, as in the references, and ellipsoidal obstacles. Different formulations of slamming coefficient were used and compared. Results are pretty encouraging and they confirm the effectiveness of lattice Boltzmann model to deal with such a problem. This leaves the door open to additional improvements addressed to the study of free buoyant bodies immersed in a fluid domain.

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Abdollahzadeh Jamalabadi, Mohammad. "An Improvement of Port-Hamiltonian Model of Fluid Sloshing Coupled by Structure Motion". Water 10, nr 12 (24.11.2018): 1721. http://dx.doi.org/10.3390/w10121721.

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The fluid–solid interaction is an interesting topic in numerous engineering applications. In this paper, the fluid–solid interaction is considered in a vessel attached to the free tip of a cantilever beam. Governing coupled equations of the system include the Euler–Bernoulli equation for bending of a beam, torsion of a beam, 2-D motion of the rigid vessel, and rotating shallow water equation of fluid sloshing in the vessel. As an essential portion in the numerical simulation of the vibration control of this fluid–plate system is the accurate modeling of sloshing; the partial differential equations of the system are modified by approximation of velocity profile. The suggested method is validated by experimental results of a piezoelectric actuated clamped rectangular plate holding a cylindrical vessel. These sloshing interactions with elastic test cases illustrate the mass conservative characteristics of the method as well as its stability in a prompt change of the vessel situations.

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Al-Baghdadi, Maher A. R. Sadiq, i Muhannad Al-Waily. "Three-dimensional fluid-thermal-structure multiphysics interaction simulation model of aluminium extrusion process". Journal of Mechanical Engineering and Sciences 15, nr 3 (19.09.2021): 8253–61. http://dx.doi.org/10.15282/jmes.15.3.2021.04.0648.

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Three dimensional fluid-thermal-structure multiphysics interaction simulation model of aluminium extrusion process has been simulated and presented in this paper. This multiphysics complex geometrical engineering process is simulated effectively using computational fluid dynamics (CFD) simulation with very high accuracy, where the aluminium material is treated as a fluid that has a very high viscosity which depends on temperature and velocity. When aluminium moving, the inner friction will work as a heat source, therefore the model of the heat transfer is completely coupled together with those governing model of the fluid dynamics. Material properties come into a viscosity function that can be related to the flow stress locally depending on forming velocity and temperature. In addition, the stresses distribution in the die that introduces due to the fluid pressure and the thermal loads has been modelled by fully coupled the simulation model with the structural mechanic's analysis. Fully three-dimensional results during the process of the temperature distribution, velocity profile, von Mises stress distribution, total displacement and deflection distribution, equivalent volumetric strain distribution, and pressure distribution are presented and analysed with a focus on the fundamental understanding. The model is shown to be able to provide a computer-aided design tool for optimize this complex engineering process by improving productivity and reducing scrap.

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Vierendeels, J., K. Dumont i P. R. Verdonck. "A partitioned strongly coupled fluid-structure interaction method to model heart valve dynamics". Journal of Computational and Applied Mathematics 215, nr 2 (czerwiec 2008): 602–9. http://dx.doi.org/10.1016/j.cam.2006.04.067.

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Belytschko, T., M. Karabin i J. I. Lin. "Fluid-Structure Interaction in Waterhammer Response of Flexible Piping". Journal of Pressure Vessel Technology 108, nr 3 (1.08.1986): 249–55. http://dx.doi.org/10.1115/1.3264783.

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In the waterhammer analysis of piping systems, incompressible (or added mass) representations are generally used in computing the response of the piping. It is shown that this procedure is not necessarily conservative, particularly for thin-walled, flexible piping systems, and that fully coupled fluid-structure solutions can predict higher loads and stresses. A modal recovery procedure which easily permits the representation on the acoustic effects of the fluid to be included in a structural model is also presented. Results are given for both simple models and a piping system from an LMFBR design.

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Zhou, Min Zhe, Tong Chun Li, Yuan Ding i Xiao Chun Zhou. "Fluid-Structure Interaction Analysis of Layered Water Intake Structure Considering Load Changes". Advanced Materials Research 1065-1069 (grudzień 2014): 569–74. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.569.

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Coupled vibration of water and stop log gate in the layered water intake structure will occur under the condition of the sudden load changes. A fluid-structure interaction (FSI) finite element model of the layered water intake structure of a hydropower station was established by using the finite element software ADINA to simulate the process of power on and off and the FSI phenomena of stop log gate during each process, and also verify the security of the scheme. The results show that fluid-structure interaction has a significant impact on the running of the layered water intake.

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Yim, Solomon C., Huan Lin i Katsuji Tanizawa. "FNPF Analysis of Stochastic Experimental Fluid-Structure Interaction Systems". Journal of Offshore Mechanics and Arctic Engineering 129, nr 1 (1.09.2006): 9–20. http://dx.doi.org/10.1115/1.2426990.

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A two-dimensional fully nonlinear potential flow model is employed to investigate nonlinear stochastic responses of an experimental fluid-structure interaction system that includes both single-degree-of-freedom surge-only and two-degree-of-freedom surge-heave coupled motions. Sources of nonlinearity include free surface boundary, fluid-structure interaction, and large geometry in the structural restoring force. Random waves performed in the tests include nearly periodic, periodic with band-limited noise, and narrow band. The structural responses observed can be categorized as nearly deterministic (harmonic, sub- and super-harmonic), noisy periodic, and random. Transition phenomena between coexisting response attractors are also identified. An implicit boundary condition upholding the instantaneous equilibrium between the fluid and structure using a mixed Eulerian-Lagrangian method is employed. Numerical model predictions are calibrated and validated via the experimental results under the three types of wave conditions. Extensive simulations are conducted to identify the response characteristics and the effects of random perturbations on nonlinear responses near primary and secondary resonances.

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Failer, Lukas, Piotr Minakowski i Thomas Richter. "On the Impact of Fluid Structure Interaction in Blood Flow Simulations". Vietnam Journal of Mathematics 49, nr 1 (28.01.2021): 169–87. http://dx.doi.org/10.1007/s10013-020-00456-6.

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AbstractWe study the impact of using fluid-structure interactions (FSI) to simulate blood flow in a stenosed artery. We compare typical flow configurations using Navier–Stokes in a rigid geometry setting to a fully coupled FSI model. The relevance of vascular elasticity is investigated with respect to several questions of clinical importance. Namely, we study the effect of using FSI on the wall shear stress distribution, on the Fractional Flow Reserve and on the damping effect of a stenosis on the pressure amplitude during the pulsatile cycle. The coupled problem is described in a monolithic variational formulation based on Arbitrary Lagrangian Eulerian (ALE) coordinates. For comparison, we perform pure Navier–Stokes simulations on a pre-stressed geometry to give a good matching of both configurations. A series of numerical simulations that cover important hemodynamical factors are presented and discussed.

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Yousif, Assim Hameed, Wafa Abd Soud Aljanabi i Ali Mohammedridha Mahdi. "Dynamic Analysis of Fluid – Structure Interaction of Axial Fan System". Journal of Engineering 21, nr 9 (1.09.2015): 150–68. http://dx.doi.org/10.31026/j.eng.2015.09.10.

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Fluid-structure interaction method is performed to predict the dynamic characteristics of axial fan system. A fluid-structure interface physical environment method (monolithic method) is used to couple the fluid flow solver with the structural solver. The integration of the three-dimensional Navier-Stokes equations is performed in the time Doman, simultaneously to the integration of the three dimensional structural model. The aerodynamic loads are transfer from the flow to structure and the coupling step is repeated within each time step, until the flow solution and the structural solution have converged to yield a coupled solution of the aeroelastic set of equations. Finite element method is applied to solve numerically the Navier-Stockes equations coupled with the structural equations The first ten eigenvalue (natural frequency), the first ten eigenvector (mode shape) and effective stress for each part of a rotor system and complete system assembly are predicted. The validity of the predicted dynamic characteristics of duct fan system was confirmed experimentally by investigating geometrically similar fan system test rig. Good agreement of dynamic characteristics is observed between experimental and numerical results.

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Hu, Zhe, Wenyong Tang, Hongxiang Xue, Xiaoying Zhang i Kunpeng Wang. "Numerical study of rogue wave overtopping with a fully-coupled fluid-structure interaction model". Ocean Engineering 137 (czerwiec 2017): 48–58. http://dx.doi.org/10.1016/j.oceaneng.2017.03.022.

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Ye, Jianhong, Dongsheng Jeng, Ren Wang i Changqi Zhu. "Validation of a 2-D semi-coupled numerical model for fluid–structure–seabed interaction". Journal of Fluids and Structures 42 (październik 2013): 333–57. http://dx.doi.org/10.1016/j.jfluidstructs.2013.04.008.

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Maruthavanan, Duraikannan, Arthur Seibel i Josef Schlattmann. "Fluid-Structure Interaction Modelling of a Soft Pneumatic Actuator". Actuators 10, nr 7 (15.07.2021): 163. http://dx.doi.org/10.3390/act10070163.

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This paper presents a fully coupled fluid-structure interaction (FSI) simulation model of a soft pneumatic actuator (SPA). Previous research on modelling and simulation of SPAs mostly involves finite element modelling (FEM), in which the fluid pressure is considered as pressure load uniformly acting on the internal walls of the actuator. However, FEM modelling does not capture the physics of the fluid flow inside an SPA. An accurate modelling of the physical behaviour of an SPA requires a two-way FSI analysis that captures and transfers information from fluid to solid and vice versa. Furthermore, the investigation of the fluid flow inside the flow channels and chambers of the actuator are vital for an understanding of the fluid energy distribution and the prediction of the actuator performance. The FSI modelling is implemented on a typical SPA and the flow behaviour inside the actuator is presented. Moreover, the bending behaviour of the SPA from the FSI simulation results is compared with a corresponding FEM simulation.

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Seybert, A. F., T. W. Wu i W. L. Li. "A Coupled FEM/BEM for Fluid-Structure Interaction Using Ritz Vectors and Eigenvectors". Journal of Vibration and Acoustics 115, nr 2 (1.04.1993): 152–58. http://dx.doi.org/10.1115/1.2930325.

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In this paper, the finite element (FEM) and the boundary element method (BEM) are combined together to solve a class of fluid-structure interaction problems. The FEM is used to model the elastic structure and the BEM is used to model the acoustic fluid. Quadratic isoparametric elements are used in both the FEM and BEM models. Continuity conditions of pressure and normal velocity are enforced at the fluid-structure interface on which the normal vector is not required to be uniquely defined. An enhanced CHIEF formulation is adopted to overcome the nonuniqueness difficulty at critical frequencies. To reduce the dimension of the coupled structural acoustic equations, the structural displacement is approximated by a linear combination of either Ritz vectors or eigenvectors. An error norm and a participation factor are defined so that it is possible to evaluate the accuracy of a solution and to omit vectors with small participation factors. Example problems are solved to examine the accuracy of the numerical solutions and to compare the efficiency of the Ritz vector and eigenvector syntheses.

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Chen, Jie, i Qiu-Sheng Li. "Nonlinear Dynamics of a Fluid–Structure Coupling Model for Vortex-Induced Vibration". International Journal of Structural Stability and Dynamics 19, nr 07 (26.06.2019): 1950071. http://dx.doi.org/10.1142/s0219455419500718.

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This paper presents a fluid–structure coupling model to investigate the vortex-induced vibration of a circular cylinder subjected to a uniform cross-flow. A modified van der Pol nonlinear equation is employed to represent the fluctuating nature of vortex shedding. The wake oscillator is coupled with the motion equation of the cylinder by applying coupling terms in modeling the fluid–structure interaction. The transient responses of the fluid–structure coupled model are presented and discussed by numerical simulations. The results demonstrate the main features of the vortex-induced vibration, such as lock-in phenomenon, i.e. resonant oscillation of the cylinder occurs when the vortex shedding frequency is near to the natural frequency of the cylinder. The resonant responses of the fluid–structure coupled model in the lock-in region are determined by the multiple scales method. The accuracy of the asymptotic solution by the multiple scales method is verified by comparing with the numerical solution from the motion equation. The effects of different parameters on the steady state amplitude of oscillation are investigated for a given set of parameters. Frequency–response curves obtained from the modulation equation demonstrate the existence of jump phenomena.

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Wang, Chun Tao, i You Ping Wu. "Modal Analysis on the Coupled Fluid-Structure Interaction of High Arch Dam". Advanced Materials Research 919-921 (kwiecień 2014): 1234–39. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.1234.

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The dynamic analysis of arch dam need to take complex coupling action of dam-foundation-water into account, so the dam is always simplified in former research. The disadvantage of simplification is that it cannot be determined how much influence on natural frequency and dynamic response can be caused. In view of this, Xiaowan high arch dam finite element model is set up, the result shows : whether the reservior is empty or full, the natural vibration frequency of the actual body form has little change compare with the simplified body form. Therefore, it is feasible to apply the simplified body form to substitute the actual body form for the rough calculation of the frequency of dam body. However, the simplified body form is impossible to present the dynamic response and stress concentration of accessory structures. For this reason, it should apply the actual body form for calculation.

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Hara, F. "Seismic Vibration Analysis of Fluid-Structure Interaction in LMFBR Piping Systems". Journal of Pressure Vessel Technology 110, nr 2 (1.05.1988): 177–81. http://dx.doi.org/10.1115/1.3265583.

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This paper is a basic study on the vibrational characteristics of an LMFBR piping system containing liquid sodium under one-dimensional seismic excitation. Using Z-shaped piping, we formulate coupled equations for the pipe’s bending vibration and pressure wave, and transform them into two-degree-of-freedom vibration equations for the first modes of the piping vibration and pressure wave. A numerical study using the vibration model shows that: 1) the coupling effect appears between piping acceleration and liquid pressure for a piping configuration having a natural frequency ratio ν = about 0.5 to 2.0; 2) the magnitude of seismically induced pressure reaches 0.7 kPa to 1 kPa per gal; and 3) the dead-mass model of liquid gives a nonconservative response depending on the pipe’s geometrical configuration, compared to that from the pressure-wave-piping-interaction model.

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Gao, Xinglong, Qingbin Zhang i Qiangang Tang. "Fluid-Structure Interaction Analysis of Parachute Finite Mass Inflation". International Journal of Aerospace Engineering 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/1438727.

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Parachute inflation is coupled with sophisticated fluid-structure interaction (FSI) and flight mechanic behaviors in a finite mass situation. During opening, the canopy often experiences the largest deformation and loading. To predict the opening phase of a parachute, a computational FSI model for the inflation of a parachute, with slots on its canopy fabric, is developed using the arbitrary Lagrangian-Euler coupling penalty method. In a finite mass situation, the fluid around the parachute typically has an unsteady flow; therefore, a more complex opening phase and FSI dynamics of a parachute are investigated. Navier-Stokes (N-S) equations for uncompressible flow are solved using an explicit central difference method. The three-dimensional visualization of canopy deformation as well as the evolution of dropping velocity and overload is obtained and compared with the experimental results. This technique could be further applied in the airdrop test of a parachute for true prediction of the inflation characteristics.

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Liu, Xinying, i David F. Fletcher. "Verification of fluid-structure interaction modelling for wave propagation in fluid-filled elastic tubes". Journal of Algorithms & Computational Technology 17 (styczeń 2023): 174830262311597. http://dx.doi.org/10.1177/17483026231159793.

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This paper presents a verification study of wave propagation in fluid-filled elastic tubes using a coupled numerical simulation method by comparing the simulation results with analytical solutions. A three-dimensional fluid-structure interaction numerical model is built using Ansys software. Wave propagation is investigated by applying a pressure pulse at the inlet of a fluid-filled elastic tube. The speed of the pressure wave and the radial displacement of the tube are simulated and compared with theoretical values. Simulation results yield a high level of accuracy. Different structural elements are used to represent the tube, and their impact on the results is discussed. The effects of tube material, tube constraints and fluid properties are also investigated in this study.

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Girfoglio, Michele, Annalisa Quaini i Gianluigi Rozza. "Fluid-structure interaction simulations with a LES filtering approach in solids4Foam". Communications in Applied and Industrial Mathematics 12, nr 1 (1.01.2021): 13–28. http://dx.doi.org/10.2478/caim-2021-0002.

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Abstract The goal of this paper is to test solids4Foam, the fluid-structure interaction (FSI) toolbox developed for foam-extend (a branch of OpenFOAM), and assess its flexibility in handling more complex flows. For this purpose, we consider the interaction of an incompressible fluid described by a Leray model with a hyperelastic structure modeled as a Saint Venant-Kirchho material. We focus on a strongly coupled, partitioned fluid-structure interaction (FSI) solver in a finite volume environment, combined with an arbitrary Lagrangian-Eulerian approach to deal with the motion of the fluid domain. For the implementation of the Leray model, which features a nonlinear differential low-pass filter, we adopt a three-step algorithm called Evolve-Filter-Relax. We validate our approach against numerical data available in the literature for the 3D cross flow past a cantilever beam at Reynolds number 100 and 400.

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Müller, Maximilian, Malte Woidt, Matthias Haupt i Peter Horst. "Challenges of fully-coupled high-fidelity ditching simulations". MATEC Web of Conferences 233 (2018): 00020. http://dx.doi.org/10.1051/matecconf/201823300020.

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An important element of the process of aircraft certification is the demonstration of the crashworthiness of the structure in the event of an emergency landing on water, also referred to as ditching. Novel numerical simulation methods that incorporate the interaction between fluid and structure open up a promising way to model ditching in full scale. This study presents a numerical framework for the simulation of ditching on a high–fidelity level. A partitioned approach that combines a finite volume hydrodynamic fluid solver as well as an finite element structural solver is implemented using a Python-based distributed coupling environment [1]. High demands are placed both on the fluid and the structural solver. The fluid solver needs to account for hydrodynamic effects such as cavitation in order to correctly compute the ditching loads acting on the aircraft structure. In the structural model, the highly localized damage induces nonlinearities and large differences in model scale. In order to reduce the computational effort a reduced order model is used to model the failure of fuselage frames. The fluid-structure coupling requires an explicit coupling scheme. It is shown that the standard Dirichlet-Neumann approach exhibits unstable behaviour if a strong added-mass effect is present, as is the case in aircraft ditching. This indicates a need for methods other than the standard Dirichlet-Neumann approach [2].

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Larsson, Simon, Juan Manuel Rodríguez Prieto, Hannu Heiskari i Pär Jonsén. "A Novel Particle-Based Approach for Modeling a Wet Vertical Stirred Media Mill". Minerals 11, nr 1 (9.01.2021): 55. http://dx.doi.org/10.3390/min11010055.

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Modeling of wet stirred media mill processes is challenging since it requires the simultaneous modeling of the complex multiphysics in the interactions between grinding media, the moving internal agitator elements, and the grinding fluid. In the present study, a multiphysics model of an HIG5 pilot vertical stirred media mill with a nominal power of 7.5 kW is developed. The model is based on a particle-based coupled solver approach, where the grinding fluid is modeled with the particle finite element method (PFEM), the grinding media are modeled with the discrete element method (DEM), and the mill structure is modeled with the finite element method (FEM). The interactions between the different constituents are treated by loose (or weak) two-way couplings between the PFEM, DEM, and FEM models. Both water and a mineral slurry are used as grinding fluids, and they are modeled as Newtonian and non-Newtonian fluids, respectively. In the present work, a novel approach for transferring forces between grinding fluid and grinding media based on the Reynolds number is implemented. This force transfer is realized by specifying the drag coefficient as a function of the Reynolds number. The stirred media mill model is used to predict the mill power consumption, dynamics of both grinding fluid and grinding media, interparticle contacts of the grinding media, and the wear development on the mill structure. The numerical results obtained within the present study show good agreement with experimental measurements.

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Larsson, Simon, Juan Manuel Rodríguez Prieto, Hannu Heiskari i Pär Jonsén. "A Novel Particle-Based Approach for Modeling a Wet Vertical Stirred Media Mill". Minerals 11, nr 1 (9.01.2021): 55. http://dx.doi.org/10.3390/min11010055.

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Modeling of wet stirred media mill processes is challenging since it requires the simultaneous modeling of the complex multiphysics in the interactions between grinding media, the moving internal agitator elements, and the grinding fluid. In the present study, a multiphysics model of an HIG5 pilot vertical stirred media mill with a nominal power of 7.5 kW is developed. The model is based on a particle-based coupled solver approach, where the grinding fluid is modeled with the particle finite element method (PFEM), the grinding media are modeled with the discrete element method (DEM), and the mill structure is modeled with the finite element method (FEM). The interactions between the different constituents are treated by loose (or weak) two-way couplings between the PFEM, DEM, and FEM models. Both water and a mineral slurry are used as grinding fluids, and they are modeled as Newtonian and non-Newtonian fluids, respectively. In the present work, a novel approach for transferring forces between grinding fluid and grinding media based on the Reynolds number is implemented. This force transfer is realized by specifying the drag coefficient as a function of the Reynolds number. The stirred media mill model is used to predict the mill power consumption, dynamics of both grinding fluid and grinding media, interparticle contacts of the grinding media, and the wear development on the mill structure. The numerical results obtained within the present study show good agreement with experimental measurements.

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Kusić, Marina Sunara, Jure Radnić, Nikola Grgić i Alen Harapin. "Fluid Structure Interaction Analysis of Liquid Tanks by the Coupled SPH - FEM Method with Experimental Verification". Defect and Diffusion Forum 391 (luty 2019): 152–73. http://dx.doi.org/10.4028/www.scientific.net/ddf.391.152.

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The paper presents the comparison of the results between the numerical model developed for the simulation of the fluid-structure interaction problem and the experimental tests. The model is based on the so called “partition scheme” in which the equations governing the fluid’s pressures and the equations governing the displacement of the structure are solved separately, with two distinct solvers. The SPH (Smoothed Particle Hydrodynamics) method is used for the fluid and the standard FEM (Finite Element Method), based on shell elements, is used for the structure. Then, the two solvers are coupled to obtain the coupled behaviour of the fluid structure system. The elasto plastic material model for the structure includes some important nonlinear effects like yielding in compression and tension. Previously experimentally tested (on a shaking table) rectangular tanks with rigid and deformable walls were used for the verification of the developed numerical model. A good agreement between the numerical and the experimental results clearly shows that the developed model is suitable and gives accurate results for such problems. The numerical model results are validated with the experimental results and can be a useful tool for analyzing the behaviour of liquid tanks of larger dimensions.

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Formato, Gaetano, Raffaele Romano, Andrea Formato, Joonas Sorvari, Tuomas Koiranen, Arcangelo Pellegrino i Francesco Villecco. "Fluid–Structure Interaction Modeling Applied to Peristaltic Pump Flow Simulations". Machines 7, nr 3 (9.07.2019): 50. http://dx.doi.org/10.3390/machines7030050.

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In this study, fluid–structure interaction (FSI) modeling was applied for predicting the fluid flow in a specific peristaltic pump, composed of one metallic roller and a hyperelastic tube pumping a viscous Newtonian fluid. Hyperelastic material dynamics and turbulence flow dynamics were coupled in order to describe all the physics of the pump. The commercial finite element software ABAQUS 6.14 was used to investigate the performance of the pump with a 3D transient model. By using this model, it was possible to predict the von Mises stresses in the tube and flow fluctuations. The peristaltic pump generated high pressure and flow pulses due to the interaction between the roller and the tube. The squeezing and relaxing of the tube during the operative phase allowed the liquid to have a pulsatile behavior. Numerical simulation data results were compared with one cycle pressure measurement obtained from pump test loop data, and the maximum difference between real and simulated data was less than 5%. The applicability of FSI modeling for geometric optimization of pump housing was also discussed in order to prevent roller and hose parts pressure peaks. The model allowed to investigate the effect of pump design variations such as tube occlusion, tube diameter, and roller speed on the flow rate, flow fluctuations, and stress state in the tube.

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NAKAMURA, Tomoaki, Yasuo KOTAKE, Akiko MATSUMURA i Norimi MIZUTANI. "NUMERICAL ANALYSIS ON DISASTER MITIGATION SEAWALL WITH MOVABLE CROWN USING COUPLED FLUID-STRUCTURE INTERACTION MODEL". Journal of JSCE 1, nr 1 (2013): 44–55. http://dx.doi.org/10.2208/journalofjsce.1.1_44.

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NAKAMURA, Tomoaki, Yasuo KOTAKE, Akiko MATSUMURA i Norimi MIZUTANI. "NUMERICAL ANALYSIS ON DISASTER MITIGATION SEAWALL WITH MOVABLE CROWN USING COUPLED FLUID-STRUCTURE INTERACTION MODEL". Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 67, nr 1 (2011): 1–11. http://dx.doi.org/10.2208/jscejoe.67.1.

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Viola, Francesco, Valentina Meschini i Roberto Verzicco. "Fluid–Structure-Electrophysiology interaction (FSEI) in the left-heart: A multi-way coupled computational model". European Journal of Mechanics - B/Fluids 79 (styczeń 2020): 212–32. http://dx.doi.org/10.1016/j.euromechflu.2019.09.006.

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43

Hu, Dean, Ting Long, Yihua Xiao, Xu Han i Yuantong Gu. "Fluid–structure interaction analysis by coupled FE–SPH model based on a novel searching algorithm". Computer Methods in Applied Mechanics and Engineering 276 (lipiec 2014): 266–86. http://dx.doi.org/10.1016/j.cma.2014.04.001.

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Sváček, Petr. "NUMERICAL SOLUTION OF FLUID-STRUCTURE INTERACTION PROBLEMS WITH CONSIDERING OF CONTACTS". Acta Polytechnica 61, SI (10.02.2021): 155–62. http://dx.doi.org/10.14311/ap.2021.61.0155.

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This paper is interested in the mathematical modelling of the voice production process. The main attention is on the possible closure of the glottis, which is included in the model with the concept of a fictitious porous media and using the Hertz impact force The time dependent computational domain is treated with the aid of the Arbitrary Lagrangian-Eulerian method and the fluid motion is described by the incompressible Navier-Stokes equations coupled to structural dynamics. In order to overcome the instability caused by the dominating convection due to high Reynolds numbers, stabilization procedures are applied and numerically analyzed for a simplified problem. The possible distortion of the computational mesh is considered. Numerical results are shown.

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Gace, Dalson Athanase. "On the performance of a Coriolis Mass Flowmeter (CMF): experimental measurement and FSI simulation". International Journal of Metrology and Quality Engineering 13 (2022): 3. http://dx.doi.org/10.1051/ijmqe/2022002.

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Computational methods that make use of single one-way Fluid Structure Interaction (FSI) for modeling the Coriolis Mass Flowmeters' (CMFs) operations are prone to inaccuracies. These errors are due to their limitations in describing a fully coupled fluid structure interaction. The aim of this study is to produce a CFD model of a CMF that uses an iterative two-way coupling of fluid structure interaction to accurately study its performance. The computational findings are benchmarked against accurate experimental measurements of the U-shape CFM. The deviation between the computed results and experimental measurements remains about 0.1% which is deemed acceptable. This reduction of uncertainties is largely attributed to the capability of the model to describe the effects of tube vibrations on the meter's operation.

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Luo, Min, Ting Ting Xu, Ting Ting Zhao, Wen Xin Zhao i Ju Bao Liu. "Dynamic Analysis of Rotary Drillstring in Horizontal Well Based on the Fluid-Structure Interaction". Applied Mechanics and Materials 385-386 (sierpień 2013): 146–49. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.146.

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With the development of drilling technology, rotary drillstring not only produces random multi-directional collisions with the inner wall of pipe, also couples with the inner and outer annular fluids. This results in a complex system of nonlinear fluid-structure interaction. In the paper, structure and mode of operation about rotary drillstring are considered, the equations of the structure dynamics, fluid equation of continuity and momentum equation are coupled. The three-dimensional numerical model and computational method is established about the fluidstructure interaction dynamic analysis of rotary drillstring. Take the rotary drillstring and inner and outer fluids as a research object, dynamic analysis of the rotary drillstring is finished, considering the fluid-structure coupled characteristics and compare the air medium, the results show the effect of fluidstructure interaction. It can provide the feasible method for the study of the string in the oil drilling and production engineering and conduct the development of drillstring dynamics in horizontal well drilling engineering.

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Tonin, Mateus Guimarães, i Alexandre Luis Braun. "Numerical Model for the Analysis of Fluid-Structure Interaction Problems with Cable Coupling". Defect and Diffusion Forum 427 (14.07.2023): 205–14. http://dx.doi.org/10.4028/p-tquqm7.

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The present work proposes the development of numerical tools for solving fluid-structure interaction (FSI) problems where the structure is coupled with cables. For the numerical treatment of fluids in incompressible flow, the Navier-Stokes and continuity equations are discretized using a semi-implicit version of the characteristic-based split (CBS) method in the context of the finite element method (FEM), where linear tetrahedral elements are used. In the presence of moving structures, the flow equations are described through an arbitrary Lagrangian-Eulerian (ALE) formulation and a numerical scheme of mesh movement is adopted. The structure is treated through a three-dimensional rigid body approach and the cable through an elastic model with geometric nonlinearity and spatial discretization by the nodal position finite element method (NPFEM). The system of equations of motion can be temporally discretized using the implicit Newmark and generalized-α methods and a partitioned coupling scheme is used taking into account fluid-structure and cable-structure couplings. The algorithms proposed here are verified using numerical applications.

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Lin, Xihan, Jiang Liu, Weiting Jiang i Zaiguo Fu. "Analysis of 5 MW Blade Two-Way Fluid-Structure Interaction Characteristics". Journal of Physics: Conference Series 2458, nr 1 (1.03.2023): 012023. http://dx.doi.org/10.1088/1742-6596/2458/1/012023.

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Abstract A CFD-CSD coupled method was employed to establish an aeroelastic model of the NREL 5 MW wind turbine. The two-way fluid-structure interaction (FSI) simulation was carried out for this aeroelastic model. The response curves of blade tip flapwise, edgewise, and torsional deformation under normal operating conditions was obtained. The results show that the blade deformation shows a trend of increasing and then decreasing from the cut-in wind speed to the cut-out wind speed with the rise in wind speed. The maximum deformation appears in the vicinity of rated working conditions. Furthermore, the difference in aerodynamic performance between two-way FSI and one-way FSI has been studied to reveal the influence of the aeroelastic effect on performance. The two-way FSI that considers the blade deformation causes significant periodic fluctuations in the torque and thrust curves, with a maximum deviation of 3.75% in the average torque at 20 m/s. Therefore, the two-way FSI that introduces the aeroelastic effect can predict the aerodynamic performance more accurately.

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Fragassa, Cristiano, Marko Topalovic, Ana Pavlovic i Snezana Vulovic. "Dealing with the Effect of Air in Fluid Structure Interaction by Coupled SPH-FEM Methods". Materials 12, nr 7 (10.04.2019): 1162. http://dx.doi.org/10.3390/ma12071162.

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Smoothed particle hydrodynamics (SPH) and the finite element method (FEM) are often combined with the scope to model the interaction between structures and the surrounding fluids (FSI). There is the case, for instance, of aircrafts crashing on water or speedboats slamming into waves. Due to the high computational complexity, the influence of air is often neglected, limiting the analysis to the interaction between structure and water. On the contrary, this work aims to specifically investigate the effect of air when merged inside the fluid–structure interaction (FSI) computational models. Measures from experiments were used as a basis to validate estimations comparing results from models that include or exclude the presence of air. Outcomes generally showed a great correlation between simulation and experiments, with marginal differences in terms of accelerations, especially during the first phase of impact and considering the presence of air in the model.

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Banks, J. W., i B. Sjögreen. "A Normal Mode Stability Analysis of Numerical Interface Conditions for Fluid/Structure Interaction". Communications in Computational Physics 10, nr 2 (sierpień 2011): 279–304. http://dx.doi.org/10.4208/cicp.060210.300910a.

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AbstractIn multi physics computations where a compressible fluid is coupled with a linearly elastic solid, it is standard to enforce continuity of the normal velocities and of the normal stresses at the interface between the fluid and the solid. In a numerical scheme, there are many ways that velocity- and stress-continuity can be enforced in the discrete approximation. This paper performs a normal mode stability analysis of the linearized problem to investigate the stability of different numerical interface conditions for a model problem approximated by upwind type finite difference schemes. The analysis shows that depending on the ratio of densities between the solid and the fluid, some numerical interface conditions are stable up to the maximal CFL-limit, while other numerical interface conditions suffer from a severe reduction of the stable CFL-limit. The paper also presents a new interface condition, obtained as a simplified characteristic boundary condition, that is proved to not suffer from any reduction of the stable CFL-limit. Numerical experiments in one space dimension show that the new interface condition is stable also for computations with the non-linear Euler equations of compressible fluid flow coupled with a linearly elastic solid.

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