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HYBRID ANALYTICAL-NUMERICAL METHODOLOGY FOR COMPUTATIONALLY EFFICIENT PRE-DESIGN ANALYSIS OF fluid-structure interaction 6

HYBRID ANALYTICAL-NUMERICAL METHODOLOGY FOR COMPUTATIONALLY ...

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6th International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS)

作者： Rubio, Jordi Iakovlev, Serguei Diez, Pedro Univ Politecn Cataluna Lab Calcul Numer Dept Matemat Aplicada 3 Barcelona Spain Dalhousie Univ Dept Engn Math & Internetworking Halifax NS Canada

ISBN: (纸本)9788494392832

Analytical approach to modeling the interaction between submerged elastic structures and non- stationary loads has long been recognized as an attractive tool of engineering analysis, especially at the pre- design stage where it has been particularly valued for its high computational efficiency. At the same time, the approach has a number of limitations, the most regrettable one being its inability to handle geometries that are more complex than the basic ones such as a spherical or cylindrical geometry. We present an attempt to overcome this limitation while still preserving the much favored computational efficiency by introducing a hybrid methodology that combines the analytical and finiteelement approaches. We then validate the methodology using available experimental data and show that a good agreement with the experiments is observed.

关键词： fluid-structure interaction hybrid techniques numerical-analytical techniques pre-design analysis

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COMPARISON OF ADVANCED TURBULENCE MODELING APPROACHES FOR fluid-structure interaction 6

COMPARISON OF ADVANCED TURBULENCE MODELING APPROACHES FOR FL...

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6th International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS)

作者： Ali, A. Reimann, T. Sternel, D. C. Schaefer, M. Tech Univ Darmstadt Inst Numer Methods Mech Engn Dolivostr 15 D-64293 Darmstadt Germany

ISBN: (纸本)9788494392832

In this study we present the results of the benchmark of a turbulent fluid-structure interaction test case. An implicit partitioned approach is employed to couple the fluid and structure subproblems. We employ three different techniques to model the turbulence in fluid motion. A 2-d unsteady Reynolds Averaged Navier-Stokes approach, with an elliptic relaxation based turbulence model (zeta-f), successfully captures the oscillation mode. Further investigations are performed with a Delayed Detached Eddy Simulation and a Large Eddy Simulation model. The zeta-f model is used as a baseline unsteady Reynolds Averaged Navier-Stokes model for the Delayed Detached Eddy Simulation. A comparison of the structural deflections from the simulations show a reasonable agreement with the experiment. In light of the presented results, the suitability of the modeling approaches is discussed.

关键词： fluid-structure interaction Turbulence Delayed Detached-Eddy Simulation Large Eddy Simulation

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A PARALLEL FULLY-COUPLED fluid-structure interaction SIMULATION OF A CEREBRAL ANEURYSM 6

A PARALLEL FULLY-COUPLED FLUID-STRUCTURE INTERACTION SIMULAT...

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6th International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS)

作者： Eken, Ali Sahin, Mehmet Istanbul Tech Univ Fac Aeronaut & Astronaut Astronaut Engn Dept TR-34469 Istanbul Turkey

ISBN: (纸本)9788494392832

A parallel fully-coupled approach has been developed for the fluid-structure interaction problem in a cerebral artery with aneurysm. An Arbitrary Lagrangian-Eulerian formulation based on the side-centered unstructured finite volume method [2] is employed for the governing incompressible Navier-Stokes equations and the classical Galerkin finite element formulation is used to discretize the constitutive law for the Saint Venant-Kirchhoff material in a Lagrangian frame for the solid domain. A special attention is given to construct an algorithm with exact fluid mass/volume conservation while obeying the global discrete geometric conservation law (DGCL). The resulting large-scale algebraic linear equations are solved using a one-level restricted additive Schwarz preconditioner with a block-incomplete factorization within each partitioned sub-domains. The parallel implementation of the present fully coupled unstructured fluid-structure solver is based on the PETSc library for improving the efficiency of the parallel algorithm. The proposed numerical algorithm is applied to a complicated problem involving unsteady pulsatile blood flow in a cerebral artery with aneurysm as a realistic fluid-structure interaction problem encountered in biomechanics.

关键词： fluid-structure interaction Monolithic Methods ALE Methods Cerebral Aneurysm

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Smoothed Particle Hydrodynamics and Model-Order Reduction for Efficient Modeling of fluid-structure interaction 8

Smoothed Particle Hydrodynamics and Model-Order Reduction fo...

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8th Vienna International Conference on Mathematical Modelling

作者： Schorgenhumer, Markus Humer, Alexander Gerstmayr, Johannes Linz Ctr Mechatron GmbH Linz Austria Johannes Kepler Univ Linz Inst Tech Mech A-4040 Linz Austria Univ Innsbruck Inst Mechatron A-6020 Innsbruck Austria

Modeling the interaction of fluids with moving, flexible structures is a major and still very challenging subject in the field of multi-physics problems. In this work, an efficient computational approach based on the coupling of modally reduced flexible multibody systems with fluids modeled by means of smoothed particle hydrodynamics is outlined. (C) 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： flexible multibody dynamics fluid-structure interaction generalized component mode synthesis smoothed particle hydrodynamics simulator coupling

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A NEW VERY LARGE EDDY SIMULATION MODEL IN THE CONTEXT OF fluid-structure interaction 6

A NEW VERY LARGE EDDY SIMULATION MODEL IN THE CONTEXT OF FLU...

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6th International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS)

作者： Kondratyuk, A. Schaefer, M. Tech Univ Darmstadt Grad Sch Computat Engn GSC CE Dolivostrae 15 D-64293 Darmstadt Germany Tech Univ Darmstadt Inst Numer Methods Mech Engn D-64293 Darmstadt Germany

ISBN: (纸本)9788494392832

In the present work one of the hybrid VLES (Very Large Eddy Simulation) turbulence models is investigated in the context of fluid- structure interaction (FSI). Firstly, the formulation of the VLES model for two different RANS models (k - sigma and sigma - f) is validated with a fully- developed channel flow at a turbulent Reynolds number of Re = 395. Then, this model is used to calculate the flow over an inclining plate in order to investigate the potential of VLES for moving structures. The results of simulations using two different background RANS models are compared to URANS and DDES results. In addition, the simulation results for different underlying RANS models are discussed.

关键词： Turbulent Flow Very Large Eddy Simulation Hybrid Methods fluid-structure interaction

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Stable discretization and robust preconditioning for fluid-structure interaction

Stable discretization and robust preconditioning for fluid-s...

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作者： Yang, Kai PennState University Libraries

学位级别：Doctor of Philosophy

In the simulation of multiphysics systems, we often encounter large-scale linear systems arising from the implicit time discretizations of coupled PDEs. Although it is possible to utilize the existing solvers for each field, systematic study is necessary in order to design fast solvers for the coupled systems. For large-scale sparse linear systems, preconditioned Krylov subspace methods are usually the most efficient solvers. Preconditioning techniques are the key to ensuring that these iterative solvers perform in a robust way for various applications. In this dissertation, we study the well-posedness of linear systems, based on which we develop robust preconditioners. By using this procedure, we study the well-posedness of poroelasticity and fluid-structure interaction and propose robust block preconditioners. In addition to exploring preconditioning techniques, we also introduce a new arbitrary Lagrangian Eulerian method for fluid-structure interaction with structure undergoing large rotation and small deformation. This technique provides a new approach to modeling important applications such as hydroelectric power generators and artificial heart pumps.

关键词： fluid-structure interaction poroelasticity block preconditioner

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Spectral analysis and asymptotic decay of the solutions to multilayered structure-Stokes fluid interaction PDE system

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JOURNAL OF DIFFERENTIAL EQUATIONS 2025年 427卷 1-25页

作者： Geredeli, Pelin G. Clemson Univ Sch Math & Stat Sci Clemson SC 29634 USA

In this work, the dynamics of a multilayered structure-fluid interaction (FSI) PDE system is considered. Here, the coupling of 3D Stokes and 3D elastic dynamics is realized via an additional 2D elastic equation on the boundary interface. Such modeling PDE systems appear in the mathematical modeling of eukaryotic cells and vascular blood flow in mammalian arteries. We analyze the long time behavior of solutions to such FSI coupled system in the sense of strong stability. Our proof is based on an analysis of the spectrum of the associated semigroup generator A which in particular entails the elimination of all three parts of the spectrum of A from the imaginary axis. In order to avoid steady states in our stability analysis, we firstly show that zero is an eigenvalue for the operator A, and we provide a characterization of the (one dimensional) zero eigenspace Null(A). In turn, we address the issue of asymptotic decay of the solution to the zero state for any initial data taken from the orthogonal complement of the zero eigenspace Null(A)L. (c) 2025 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： fluid-structure interaction Stokes flow Stability

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fluid-structure interaction simulation of pulse propagation in arteries: Numerical pitfalls and hemodynamic impact of a local stiffening

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INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE 2014年第Apr.期77卷 1-13页

作者： Taelman, L. Degroote, J. Swillens, A. Vierendeels, J. Segers, P. Univ Ghent IBiTech BioMMeda B-9000 Ghent Belgium Univ Ghent Dept Flow Heat & Combust Mech B-9000 Ghent Belgium

When simulating the propagation of a pressure pulse in arteries, the discretization parameters (i.e. the time step size Delta t and the grid size Delta x) need to be chosen carefully in order to avoid a decrease in amplitude of the traveling wave due to numerical dissipation. In this paper the effect of numerical dissipation is examined using a numerical fluid structure interaction (FSI) model of the pulse propagation in an artery. More insight in the influence of the temporal and spatial resolution of the wave on the results of these simulations is gained using an analytical study in which the scalar linear one-dimensional transport equation is considered. Although this model does not take into account the full complexity of the problem under consideration, the results can be used as a guidance for the selection of the numerical parameters. Furthermore, this analysis illustrates the difference in accuracy that can be obtained using a second-order implicit time integration scheme instead of a first-order scheme. The results from the analytical and numerical studies are subsequently used to determine the settings necessary to obtain a grid and time step converged simulation of the wave propagation and reflection in a simplified model of an aorta with repaired aortic coarctation. This FSI model allows to study the hemodynamic impact of a stiff segment and demonstrates that the presence of a stiff segment has an important impact on a short pressure pulse, but has almost no influence on a physiological pressure pulse. This phenomenon is explained by analyzing the reflections induced by the stiff segment. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Numerical dissipation Wave propagation Pulse wave analysis Aortic coarctation

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fluid-structure interaction Analysis of Pulsatile Flow within a Layered and Stenotic Aorta

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MOLECULAR & CELLULAR BIOMECHANICS 2014年第2期11卷 129-149页

作者： Liu, Zheng-qi Liu, Ying Liu, Tian-tian Yang, Qing-shan Beijing Jiaotong Univ Sch Civil Engn Dept Mech Beijing 100044 Peoples R China Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China

In this paper, the hemodynamic characteristics of blood flow and stress distribution in a layered and stenotic aorta are investigated. By introducing symmetrical and unsymmetrical stenosis, the influence of stenosis morphology and stenotic ratio on the coupled dynamic responses of aorta is clarified. In the analysis, the in-vivo pulsatile waveforms and fully fluid structure interaction (PSI) between the layered elastic aorta and the blood are considered. The results show that the fluid domain is abnormal in the stenotic aorta, and the whirlpool forms at the obstructed and downstream unobstructed regions. The maximum wall shear stresses appear at the throat of the stenosis. Downstream region appears low and oscillated shear stresses. In addition, along with the increase of the stenotic ratio, the amplitude of the maximum shear stress will be intensively increased and localized, and the sensitivity is also increased. In the aorta with unsymmetrical stenosis, the Von Mises stresses reach the peak value at the side with the surface protuberance, but they are reduced at the side with no protuberance. The sign variation of the layer interface shear stresses near the throat indicates the variation of the shear direction which increases the opportunity of shear damage at the transition plane. Moreover, the shear stress levels at the fluid-solid and intima-media interfaces are higher than that at the media-adventitia interface. The unsymmetrical stenosis causes higher stresses at the side with the surface protuberance than symmetrical one, but lower at the side with no protuberance. These results provide an insight in the influence of the stenosis, as well as its morphology, on the pathogenesis and pathological evolution of some diseases, such as arteriosclerosis and aortic dissection.

关键词： Aorta Stenosis fluid-structure interaction Hemodynamic characteristic Stress distribution

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fluid-structure interaction study on the performance of flexible articulated caudal fin

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ADVANCED ROBOTICS 2014年第24期28卷 1665-1676页

作者： Liu, Bo Zhang, Shiwu Qin, Fenghua Yang, Jie Univ Sci & Technol China Dept Precis Machinery & Precis Instrumentat Hefei 230026 Anhui Peoples R China Univ Sci & Technol China Dept Modern Mech Hefei 230026 Anhui Peoples R China

In this paper, the propulsive performance of a flexible articulated caudal fin is investigated by fluid-structure interaction. The caudal fin is composed of two links which are connected by a hinge. One link is driven by pitching motion while the other one moves passively. Five cases of link flexibility are investigated, namely, the rigid-rigid case, the medium flexible-medium flexible case, the flexible-flexible case, the rigid-flexible case and the flexible-rigid case. Their fluid field and structure deformations are analysed and hydrodynamic forces are compared. It is found that the rigid-rigid caudal fin produces larger thrust force than other cases with a low-pitching frequency, while the rigid-flexible case performs better with a higher frequency. The mean thrust force increases with the frequency in our experiments, however, for the medium flexible-medium flexible case, an optimal frequency exists. Besides, the effect of the hinge stiffness is studied. It is seen that the medium flexible-medium flexible case exhibits a striking performance. When the hinge stiffness decreases, its mean thrust force increases and possesses larger amplitude while the forces of other cases decrease. These results can guide the design of flexible propeller with links and will be useful for the development of flexible underwater robots.

关键词： articulated caudal fin flexibility fluid-structure interaction hydrodynamic forces

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