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LUMA: A many-core, fluid-structure interaction solver based on the Lattice-Boltzmann Method

SOFTWAREX 2018年 7卷 88-94页

作者： Harwood, Adrian R. G. O'Connor, Joseph Munoz, Jonathan Sanchez Santasmasas, Marta Camps Revell, Alistair J. Univ Manchester Sch Mech Aerosp & Civil Engn Sackville St Manchester M1 3BB Lancs England

The Lattice-Boltzmann Method at the University of Manchester (LUMA) project was commissioned to build a collaborative research environment in which researchers of all abilities can study fluid-structure interaction (FSI) problems in engineering applications from aerodynamics to medicine. It is built on the principles of accessibility, simplicity and flexibility. The LUMA software at the core of the project is a capable FSI solver with turbulence modelling and many-core scalability as well as a wealth of input/output and pre- and post-processing facilities. The software has been validated and several major releases benchmarked on supercomputing facilities internationally. The software architecture is modular and arranged logically using a minimal amount of object-orientation to maintain a simple and accessible software. (C) 2018 The Authors. Published by Elsevier B.V.

关键词： Lattice-Boltzmann Method Finite-Element Method Flow simulation fluid-structure interaction

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An anisotropic constitutive model for immersogeometric fluid-structure interaction analysis of bioprosthetic heart valves

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JOURNAL OF BIOMECHANICS 2018年 74卷 23-31页

作者： Wu, Michael C. H. Zakerzadeh, Rana Kamensky, David Kiendl, Josef Sacks, Michael S. Hsu, Ming-Chen Iowa State Univ Dept Mech Engn 2025 Black Engn Ames IA 50011 USA Univ Texas Austin Inst Computat Engn & Sci Willerson Ctr Cardiovasc Modeling & Simulat 201 East 24th StStop C0200 Austin TX 78712 USA Univ Calif San Diego Dept Struct Engn 9500 Gilman DrMail Code 0085 La Jolla CA 92093 USA Norwegian Univ Sci & Technol Dept Marine Technol O Nielsens Veg 10 N-7052 Trondheim Norway

This paper considers an anisotropic hyperelastic soft tissue model, originally proposed for native valve tissue and referred to herein as the Lee-Sacks model, in an isogeometric thin shell analysis framework that can be readily combined with immersogeometric fluid-structure interaction (FSI) analysis for high-fidelity simulations of bioprosthetic heart valves (BHVs) interacting with blood flow. We find that the Lee-Sacks model is well-suited to reproduce the anisotropic stress-strain behavior of the cross linked bovine pericardial tissues that are commonly used in BHVs. An automated procedure for parameter selection leads to an instance of the Lee-Sacks model that matches biaxial stress-strain data from the literature more closely, over a wider range of strains, than other soft tissue models. The relative simplicity of the Lee-Sacks model is attractive for computationally-demanding applications such as FSI analysis and we use the model to demonstrate how the presence and direction of material anisotropy affect the FSI dynamics of BHV leaflets. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： Bioprosthetic heart valves fluid-structure interaction Immersogeometric analysis Isogeometric analysis Kirchhoff-Love shells Anisotropic constitutive models

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Coupled adjoint-based sensitivities in large-displacement fluid-structure interaction using algorithmic differentiation

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2018年第7期113卷 1081-1107页

作者： Sanchez, R. Albring, T. Palacios, R. Gauger, N. R. Economon, T. D. Alonso, J. J. Imperial Coll London Dept Aeronaut London SW7 2AZ England TU Kaiserslautern Chair Sci Comp D-67663 Kaiserslautern Germany Stanford Univ Dept Aeronaut & Astronaut Stanford CA 94305 USA

A methodology for the calculation of gradients with respect to design parameters in general fluid-structure interaction problems is presented. It is based on fixed-point iterations on the adjoint variables of the coupled system using algorithmic differentiation. This removes the need for the construction of the analytic Jacobian for the coupled physical problem, which is the usual limitation for the computation of adjoints in most realistic applications. The formulation is shown to be amenable to partitioned solution methods for the adjoint equations. It also poses no restrictions to the nonlinear physics in either the fluid or structural field, other than the existence of a converged solution to the primal problem from which to compute the adjoints. We demonstrate the applicability of this procedure and the accuracy of the computed gradients on coupled problems involving viscous flows with geometrical and material nonlinearities in the structural domain.

关键词： adjoint algorithmic differentiation fluid-structure interaction shape design

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A Higher-Order Discontinuous Galerkin/Arbitrary Lagrangian Eulerian Partitioned Approach to Solving fluid-structure interaction Problems with Incompressible, Viscous fluids and Elastic structures

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JOURNAL OF SCIENTIFIC COMPUTING 2018年第1期76卷 481-520页

作者： Wang, Yifan Quaini, Annalisa Canic, Suncica Univ Houston Dept Math Houston TX 77204 USA

This manuscript presents a discontinuous Galerkin-based numerical method for solving fluid-structure interaction problems involving incompressible, viscous fluids. The fluid and structure are fully coupled via two sets of coupling conditions. The numerical approach is based on a high-order discontinuous Galerkin (with Interior Penalty) method, which is combined with the Arbitrary Lagrangian-Eulerian approach to deal with the motion of the fluid domain, which is not known a priori. Two strongly coupled partitioned schemes are considered to resolve the interaction between fluid and structure: the Dirichlet-Neumann and the Robin-Neumann schemes. The proposed numerical method is tested on a series of benchmark problems, and is applied to a fluid-structure interaction problem describing the flow of blood in a patient-specific aortic abdominal aneurysm before and after the insertion of a prosthesis known as stent graft. The proposed numerical approach provides sharp resolution of jump discontinuities in the pressure and normal stress across fluid-structure and structure-structure interfaces. It also provides a unified framework for solving fluid-structure interaction problems involving nonlinear structures, which may develop shock wave solutions that can be resolved using a unified discontinuous Galerkin-based approach.

关键词： fluid-structure interaction Discontinuous Galerkin methods Arbitrary Lagrangian-Eulerian formulation Domain decomposition methods Hemodynamics

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Experimental and numerical investigation of the fluid-structure interaction on a flexible composite hydrofoil under viscous flows

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OCEAN ENGINEERING 2019年 194卷 106647-000页

作者： Pernod, Laetitia Ducoin, Antoine Le Sourne, Herve Astolfi, Jacques-Andre Casari, Pascal Ecole Cent Nantes CNRS LHEEA UMR 6598 Nantes France Technocampus Ocean Naval Grp Bouguenais France ICAM Ouest Inst Rech Genie Civil & Mecan GeM CNRS UMR 6183 Site Nantes Carquefou France Ecole Navale Inst Rech Ecole Navale IRENavale EA 3634 F-29240 Brest France IUT St Nazaire CNRS UMR 6183 Inst Genie Mat GeM St Nazaire France

This research investigates the fluid-structure interaction and hydroelastic response of a composite hydrofoil using an innovative joint experimental and numerical method. The main novelties are, first, the use of a state-of-the-art strain measurement technique, via a fully-distributed-optical fiber sensor directly embedded within the composite plies. This method allows for a finer representation of the structural deformations under hydrodynamic loading. Second, a tightly-coupled high-fidelity fluid-structure interaction numerical model taking into account the turbulent effects in the flow and the ply-by-ply modelling of the composite, is compared to the experimental results. A composite profile is specifically designed as a trapezoidal hydrofoil and is tested for moderate Reynolds number and pre-stall and post-stall incidences. High-speed imaging of the hydrofoil tip and vibrometer measurements are carried out to determine the experimental tip displacements and hydrofoil's vibrations. The numerical and experimental results show a very strong hydroelastic response, with a structural resonance even for low Reynolds numbers due to the high flexibility of the structure. Strong coupling of the fluid and the structure, with lock-in of the von Karman vortex-shedding to the structure for small incidences, and an excitation of the structure by leading-edge vortex-shedding for higher incidences, are also observed.

关键词： Composite hydrofoil fluid-structure interaction Tight CFD-FEM coupling Optical fiber sensors Flow-induced vibrations

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fluid structure interaction SIMULATION OF A BENCHMARK CONFIGURATION WITH A STRESS BLENDED-EDDY SIMULATION MODEL

FLUID STRUCTURE INTERACTION SIMULATION OF A BENCHMARK CONFIG...

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ASME International Mechanical Engineering Congress and Exposition (IMECE)

作者： Pratomo, Hariyo P. S. Petra Christian Univ Dept Mech Engn Surabaya Indonesia

ISBN: (纸本)9780791884584

In this work, the application of a shear stress transport based-RANS/LES turbulence modelling approach on a fluid-structure interaction (FSI) benchmark is considered after a transient computation of turbulent flow over the configuration on an LES quality mesh is to be performed. Within the unsteady decoupled simulation the scale resolving method successfully produces complex unsteady eddy sizes behind the reference test case. At a subcritical Reynolds number, a numerical Strouhal number of 0.184 which is close to a reference value of 0.18 is demonstrated by the RANS/LES turbulence model. In this scenario, a rubber added on the back part of a fixed circular cylinder is treated as a rigid thin plate during the pure flow simulation. On the LES grid resolution, the shielding function resided in the hybrid limiter of the scale resolving formulation is found to be strong to safeguard the activation of the RANS mode in the near wall region where the demarcation line between the RANS and LES modes uniquely resembles the geometry. Moreover, in the FSI simulation resolved turbulence scales interacting with moving and deforming rubber immersed in the subcritical Reynolds number-turbulent flow are successfully captured by the hybrid modelling technique coupled with a structural solver under the coupling procedure of an implicit partitioned approach. Similar with earlier studies with different scale-resolving proposals on the same FSI case, a periodic oscillating motion of the rubber that is produced from a phase-averaging method is also demonstrated in this present investigation. Nevertheless, a non-physical deformation of the rubber in the spanwise direction occurs. The new FSI result is evaluated with existing results from earlier works as a pivotal basis for further researches, such as implementations of new mesh stiffness model and filter width.

关键词： fluid-structure interaction hybrid turbulence model turbulent flow

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Modal decomposition of fluid-structure interaction with application to flag flapping

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JOURNAL OF fluidS AND structureS 2018年 81卷 728-737页

作者： Goza, Andres Colonius, Tim Princeton Univ Dept Mech & Aerosp Engn Princeton NJ 08540 USA CALITECH Div Engn & Appl Sci Pasadena CA 91125 USA

Modal decompositions such as proper orthogonal decomposition (POD), dynamic mode decomposition (DMD) and their variants are regularly used to educe physical mechanisms of nonlinear flow phenomena that cannot be easily understood through direct inspection. In fluid-structure interaction (FSI) systems, fluid motion is coupled to vibration and/or deformation of an immersed structure. Despite this coupling, data analysis is often performed using only fluid or structure variables, rather than incorporating both. This approach does not provide information about the manner in which fluid and structure modes are correlated. We present a framework for performing POD and DMD where the fluid and structure are treated together. As part of this framework, we introduce a physically meaningful norm for FSI systems. We first use this combined fluid-structure formulation to identify correlated flow features and structural motions in limit-cycle flag flapping. We then investigate the transition from limit-cycle flapping to chaotic flapping, which can be initiated by increasing the flag mass. Our modal decomposition reveals that at the onset of chaos, the dominant flapping motion increases in amplitude and leads to a bluff-body wake instability. This new bluff-body mode interacts triadically with the dominant flapping motion to produce flapping at the non-integer harmonic frequencies previously reported by Connell and Yue (2007). While our formulation is presented for POD and DMD, there are natural extensions to other data-analysis techniques. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Modal decomposition Proper orthogonal decomposition Dynamic mode decomposition

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A weak-coupling immersed boundary method for fluid-structure interaction with low density ratio of solid to fluid

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JOURNAL OF COMPUTATIONAL PHYSICS 2018年 359卷 296-311页

作者： Kim, Woojin Lee, Injae Choi, Haecheon Seoul Natl Univ Dept Mech & Aerosp Engn Seoul 08826 South Korea

We present a weak-coupling approach for fluid-structure interaction with low density ratio (rho) of solid to fluid. For accurate and stable solutions, we introduce predictors, an explicit two-step method and the implicit Euler method, to obtain provisional velocity and position of fluid-structure interface at each time step, respectively. The incompressible Navier-Stokes equations, together with these provisional velocity and position at the fluidstructure interface, are solved in an Eulerian coordinate using an immersed-boundary finite-volume method on a staggered mesh. The dynamic equation of an elastic solid-body motion, together with the hydrodynamic force at the provisional position of the interface, is solved in a Lagrangian coordinate using a finite element method. Each governing equation for fluid and structure is implicitly solved using second-order time integrators. The overall second-order temporal accuracy is preserved even with the use of lower-order predictors. A linear stability analysis is also conducted for an ideal case to find the optimal explicit two-step method that provides stable solutions down to the lowest density ratio. With the present weak coupling, three different fluid-structure interaction problems were simulated: flows around an elastically mounted rigid circular cylinder, an elastic beam attached to the base of a stationary circular cylinder, and a flexible plate, respectively. The lowest density ratios providing stable solutions are searched for the first two problems and they are much lower than 1 (rho(min)= 0.21and 0.31, respectively). The simulation results agree well with those from strong coupling suggested here and also from previous numerical and experimental studies, indicating the efficiency and accuracy of the present weak coupling. (C) 2018 Elsevier Inc. All rights reserved.

关键词： Weak coupling Predictor fluid-structure interaction Immersed boundary method Low density ratio

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A reduced mesh movement method based on pseudo elastic solid for fluid-structure interaction

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 2018年第6期232卷 973-986页

作者： Zhong, Jize Xu, Zili Xi An Jiao Tong Univ State Key Lab Strength & Vibrat Mech Struct 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China

A reduced mesh movement method based on pseudo elastic solid is developed and applied in fluid-structure interaction problems in this paper. The flow mesh domain is assumed to be a pseudo elastic solid. The vibration equation for the structure and the pseudo elastic solid together is derived by applying the displacement continuity condition on the fluid-structure interface. Considering that the actual fluid-structure coupled vibration for structures often appears to be associated with low-order modes, the nodal displacements for the structure and the flow mesh can be computed using the modal superposition of a few low-order modes. Coupled fluid-structure computations are performed for flutter problems of a beam and wing 445.6 using the present method. The calculated results are consistent with the data reported in other references. The computing time is reduced by 65.5% for the beam flutter and 54.8% for the wing flutter compared with the pre-existing elastic solid method.

关键词： fluid-structure interaction mesh movement pseudo elastic solid reduced mesh movement method flutter

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A semi-implicit coupling technique for fluid-structure interaction problems with strong added-mass effect

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JOURNAL OF fluidS AND structureS 2018年 80卷 94-112页

作者： Naseri, Alireza Lehmkuhl, Oriol Gonzalez, Ignacio Bartrons, Eduard David Perez-Segarra, Carlos Oliva, Assensi Univ Politecn Catalunya BarcelonaTech UPC Heat & Mass Transfer Technol Ctr CTTC ESEIAAT Colom 11 Terrassa 08222 Barcelona Spain

This paper is concerned with the numerical simulation of fluid-structure interaction problems involving an incompressible viscous flow and an elastic structure. A semi-implicit coupling technique is presented which strongly couples the added-mass term of the fluid (pressure stress) to the structure, while the remaining terms are only loosely coupled. A thorough numerical analysis is carried out to verify the accuracy of the proposed method by comparing its results to experimental data and other numerical results from the literature. The performance and accuracy of the proposed method are also compared against a fully implicit coupling technique. Numerical tests show that semi-implicit coupling significantly reduces the computational cost of the simulations without undermining either the stability or the accuracy of the results. The question of implicit or explicit coupling of the dynamic mesh step is addressed by evaluating its effect on the overall accuracy and performance of the semi-implicit method. The implicit coupling of the dynamic mesh step is found to slightly improve the accuracy, while significantly increasing the computational cost. Moreover a comparison is made on the performance of the semi-implicit method with different interface solvers. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Numerical simulation Partitioned method Semi-implicit coupling

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