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In Vivo Based fluid-structure interaction Biomechanics of the Left Anterior Descending Coronary Artery

JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME 2021年第8期143卷 081001-081001页

作者： Carpenter, Harry J. Gholipour, Alireza Ghayesh, Mergen H. Zander, Anthony C. Psaltis, Peter J. Univ Adelaide Sch Mech Engn Adelaide SA 5005 Australia South Australian Hlth & Med Res Inst SAHMRI Vasc Res Ctr Lifelong Hlth Theme Adelaide SA 5000 Australia Univ Adelaide Adelaide Med Sch Adelaide SA 5000 Australia Cent Adelaide Local Hlth Network Dept Cardiol Adelaide SA 5000 Australia

A fluid-structure interaction-based biomechanical model of the entire left anterior descending coronary artery is developed from in vivo imaging via the finite element method in this paper. Included in this investigation is ventricle contraction, three-dimensional motion, all angiographically visible side branches, hyper/viscoelastic artery layers, non-Newtonian and pulsatile blood flow, and the out-of-phase nature of blood velocity and pressure. The fluid-structure interaction model is based on in vivo angiography of an elite athlete's entire left anterior descending coronary artery where the influence of including all alternating side branches and the dynamical contraction of the ventricle is investigated for the first time. Results show the omission of side branches result in a 350% increase in peak wall shear stress and a 54% decrease in von Mises stress. Peak von Mises stress is underestimated by up to 80% when excluding ventricle contraction and further alterations in oscillatory shear indices are seen, which provide an indication of flow reversal and has been linked to atherosclerosis localization. Animations of key results are also provided within a video abstract. We anticipate that this model and results can be used as a basis for our understanding of the interaction between coronary and myocardium biomechanics. It is hoped that further investigations could include the passive and active components of the myocardium to further replicate in vivo mechanics and lead to an understanding of the influence of cardiac abnormalities, such as arrythmia, on coronary biomechanical responses.

关键词： fluid-structure interaction biomechanics coronary artery angiography side branch ventricle contraction athlete's heart

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Coupling total Lagrangian SPH-EISPH for fluid-structure interaction with large deformed hyperelastic solid bodies

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2021年 381卷 113832-113832页

作者： Morikawa, Daniel S. Asai, Mitsuteru Kyushu Univ Nishi Ku 744 Motooka Fukuoka Japan

In this work, we propose a two-way coupling technique between a total Lagrangian smoothed particle hydrodynamics (SPH) method for Solid Mechanics and the explicit incompressible SPH (EISPH) to simulate fluid-structure interaction problems. In the solid part, the total Lagrangian framework guarantees that the particle distribution keep stable to correctly calculate the deformation gradient and thus the elastic forces. The constitutive model follows hyperelastic formulations, and the stability of the method is enforced by a Jameson-Schmidt-Turkel (JST) stabilization procedure. For the fluid part, we applied an EISPH formulation, which is a fully explicit incompressible scheme based on a projection method capable of providing accurate pressure distributions for free-surface flows, while avoiding costly linear equations. The coupling scheme follows the same manner as the fixed wall ghost particle (FWGP) approach, which was here adapted to include moving walls. In addition, the non-penetration condition is rigorously reinforced through a numerical algorithm to avoid penetration of every fluid particle, including free-surface particles. Our method for solid is then verified through a large deformed tension plate numerical test, and our coupling forces through a series floating tests and hydrostatic water column over a thin infinite plate. Then, the method is validated comparing it with experimental data of a dam break test in which the water column attacks a thin rubber plate. (C) 2021 Elsevier B.V. All rights reserved.

关键词： Smoothed particle hydrodynamics fluid-structure interaction Hyperelasticity

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A ghost-node immersed smoothed point interpolation method (ghost-node-ISPIM) for fluid-structure interaction problems

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OCEAN ENGINEERING 2021年 242卷 110163-110163页

作者： Wang, Shuangqiang Yan, Boqian Zhang, Guiyong Wang, Peng Yang, Borui Zhang, Zhifan Dalian Univ Technol Sch Naval Architecture State Key Lab Struct Anal Ind Equipment Dalian 116024 Peoples R China Collaborat Innovat Ctr Adv Ship & Deep Sea Explor Shanghai 200240 Peoples R China

Immersed smoothed point interpolation method (IS-PIM) was successfully proposed for solving fluid-structure interaction (FSI) problems with large solid deformations. However, the defects of IS-PIM include inaccurate solid boundary, spurious pressure oscillation and the "fresh node" phenomenon, which will cause different degrees of numerical errors. In order to solve these problems, the ghost-node immersed smoothed point interpolation method (Ghost-node-ISPIM) has been presented in this paper. In this method, the ghost-node technique is firstly proposed and achieved based on unstructured triangular elements, combined with mass source/sink algorithm and the sharp-interface method to fix the inherent defects existed in original IS-PIM. The effectiveness and superiority of the Ghost-node-ISPIM are demonstrated by a series of typical FSI numerical examples.

关键词： fluid-structure interaction Ghost-node technique Mass source sink algorithm Sharp-interface method Immersed smoothed point interpolation method

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A FEM based modeling method for analyzing the static performance of aerostatic thrust bearings considering the fluid-structure interaction

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TRIBOLOGY INTERNATIONAL 2021年 156卷 106849-106849页

作者： Gao, Qiang Qi, Lizi Gao, Siyu Lu, Lihua Song, Laiyun Zhang, Feihu Harbin Inst Technol Sch Mechatron Engn Harbin Peoples R China Harbin Inst Technol Sch Astronaut Harbin Peoples R China

The fluid-structure interaction (FSI) phenomenon has significant impact on the performance of aerostatic thrust bearings. To rapidly calculate their performance, this paper proposes a finite element method (FEM) based FSI modeling method. A FEM model of aerostatic bearing and a two dimensional FEM model of thrust plate were built, and the bidirectional data exchange between them was realized. Besides, the change of discharge coefficient caused by FSI phenomenon is considered by adopting a discharge coefficient model. The accuracy of the proposed FSI model is verified numerically and experimentally. The average calculation time is reduced from 9.36 h to 86.2 s for the case study. This research provides an efficient modeling method for the design of aerostatic thrust bearing considering FSI.

关键词： Aerostatic bearing Static performance fluid-structure interaction FEM

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A principled approach to design using high fidelity fluid-structure interaction simulations

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FINITE ELEMENTS IN ANALYSIS AND DESIGN 2021年 194卷 103562-103562页

作者： Wu, Wensi Bonneville, Christophe Earls, Christopher Cornell Univ Sch Civil & Environm Engn Ithaca NY 14850 USA Cornell Univ Ctr Appl Math Ithaca NY 14850 USA

A high fidelity fluid-structure interaction simulation may require many days to run, on hundreds of cores. This poses a serious burden, both in terms of time and economic considerations, when repetitions of such simulations may be required (e.g. for the purpose of design optimization). In this paper we present strategies based on (constrained) Bayesian optimization (BO) to alleviate this burden. BO is a numerical optimization technique based on Gaussian processes (GP) that is able to efficiently (with minimal calls to the expensive FSI models) converge towards some globally working admissible design, as gauged using a black box objective function. In this study we present a principled design evolution that moves from FSI model verification, through a series of Bridge Simulations (bringing the verification case incrementally closer to the application), in order that we may identify material properties for an underwater, unmanned, autonomous vehicle (UUAV) sail plane. We are able to achieve fast convergence towards an working admissible design, using a small number of FSI simulations (a dozen at most), even when selecting over several design parameters, and while respecting optimization constraints.

关键词： Bayesian optimization fluid-structure interaction Gaussian process Machine learning Design optimization

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Iterative improved reduced system method of fluid-structure interaction with free surface

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JOURNAL OF SOUND AND VIBRATION 2021年 514卷 116445-116445页

作者： Lee, Kang-Heon Chang, Seongmin Kim, Jin-Gyun Korea Atom Energy Res Inst KAERI SMART Reactor Design Div 169-84 Gwahak RoYuseong Gu Daejeon 34133 South Korea Kumoh Natl Inst Technol Dept Mech Design Engn Daehak Ro 61 Gumi 39177 Gyeongbuk South Korea Kyung Hee Univ Dept Mech Engn Integrated Engn 1732 Deogyeong DaeroGiheung Gu Yongin 17104 South Korea

The aim of this study is to develop an iterative improved reduced system method for the model reduction of the fluid-structure interaction with free surface. The fluid-structure interaction with incompressible fluid for the interior fluid-structure problem involving a free surface without capillarity effects and a linear elastic structure is analyzed. The present study addresses a wellknown asymmetric formulation that comprises structural displacement, fluid pressure of the free surface, and fluid pressure of the interior fluid. In this study, the formulation is reduced in a condensation manner, which is degree of freedom based reduced-order modeling. In particular, the proposed iterative scheme considers inertia terms and its equivalent transformation, thereby yielding a reduced model that more accurately reflects the features of the fully coupled system. The performance and convergence of this formulation are evaluated through numerical examples.

关键词： fluid-structure interaction Reduced-order modeling Condensation Iterative method Free surface

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An accurate FSI-SPH modeling of challenging fluid-structure interaction problems in two and three dimensions

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OCEAN ENGINEERING 2021年 221卷 108552-108552页

作者： Sun, Peng-Nan Le Touze, David Oger, Guillaume Zhang, A-Man Sun Yat Sen Univ Sch Marine Engn & Technol Zhuhai 519082 Peoples R China Ecole Cent Nantes LHEEA Lab ECN F-44300 Nantes France CNRS F-44300 Nantes France Harbin Engn Univ Coll Shipbldg Engn Harbin 150001 Peoples R China Dalian Univ Technol State Key Lab Coastal & Offshore Engn Dalian 116023 Peoples R China

The recently developed FSI-SPH model (Sun et al., 2019c), by combining the multi-resolution delta(+)-SPH scheme and a Total Lagrangian SPH method, is further extended for more complex three-dimensional (3D) fluid structure interaction (FSI) problems. The FSI-SPH model is strengthened with advanced numerical techniques, in which a combination of the Particle Shifting Technique (PST) and the Tensile Instability Control (TIC) is adopted to prevent flow voids induced by the tensile instability. The Adaptive Particle Refinement (APR) is used to refine particles in the boundary layer region and coarsen particles in the far-field to increase local accuracy but reduce overall computational cost. Moreover, the delta(+)-SPH and Total Lagrangian SPH solvers are coupled through a Modified Sequential Staggered (MSS) algorithm which, on one hand, ensures the numerical accuracy and stability and, on the other hand, improves the efficiency when magnitudes of time steps between the two solvers differ from each other significantly. In the numerical results, challenging 2D and 3D FSI cases are simulated to test the accuracy of the proposed FSI-SPH model. A new FSI benchmark with free-surface is proposed to highlight the advantage of this FSI-SPH model in simulating free-surface viscous flows. In addition, 3D effects in the FSI dam-breaking and sloshing cases are investigated.

关键词： Smoothed particle hydrodynamics delta plus -SPH FSI-SPH fluid-structure interaction Tensile instability Viscous flow

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Wind loads on a super-tall slender structure: A validation of an uncoupled fluid-structure interaction (FSI) analysis

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JOURNAL OF BUILDING ENGINEERING 2021年 35卷

作者： Wijesooriya, K. Mohotti, D. Amin, A. Chauhan, K. Univ Sydney Sch Civil Engn Fac Engn Darlington NSW 2006 Australia Univ New South Wales Sch Engn & Informat Technol Canberra ACT 2600 Australia

The paper presents a numerical validation for an innovative and time-efficient uncoupled fluid-structure interaction (FSI) method used to evaluate structural responses of super-tall structures. An aeroelastic multi-degree of freedom (MDOF) model of a super tall structure was tested in a boundary layer wind tunnel (BLWT) where tip displacements and acceleration were recorded and compared with a numerical simulation. A validated computational fluid dynamics (CFD) numerical simulation was performed to obtain wind-induced pressures in the numerical analysis. The novelty in this study lies in the mechanism that these wind pressures are communicated to the structural model in an efficient manner, to obtain structural responses. An innovative numerical technique is used to convert the wind-induced pressures on the building surface to nodal time history loads, which were then used to perform an implicit modal analysis to obtain the structure's time history response. The proposed new method was shown to perform in 240 s of clock time and could provide similar numerical accuracy to that of the experiments. Other important observations on the structure's response with regard to vortex-induced vibrations (VIV), the impact of aerodynamic damping and structural damping on the performance of the structure are critically evaluated and discussed herein. Finally, it was demonstrated that the presented numerical method could be used as an alternative to full aeroelastic wind tunnel studies to efficiently obtain structural responses of super-tall structures.

关键词： fluid-structure interaction Super-tall buildings Transient analysis Modal analysis Vortex-induced vibrations

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Splitting schemes for the stress formulation of fluid-structure interaction problems

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APPLICATIONS IN ENGINEERING SCIENCE 2022年 9卷

作者： Minev, Peter Usubov, Rahim Univ Alberta Dept Math & Stat Sci Edmonton AB T6G 2G1 Canada

In this article we demonstrate that the novel stress formulation of the Navier-Stokes equations proposed in Minev and Vabishchevich (2018) can be extended to the case of fluid-structure interaction problems. This formulation allows for an easy treatment of the fluid-structure interface boundary conditions. Furthermore, we propose a first order (in time) splitting scheme for this formulation and study its stability in the linear case. It utilizes a level set approach for the interface tracking and regularization of the interface problem. We also demonstrate how this scheme can be extended to the nonlinear case of a neo-Hookean elastic material. The computational complexity of the resulting problem seem to be comparable or better than most available schemes that treat the problem in primitive variables. A downside of such an approach is that it requires a higher than the traditional formulations in terms of primitive unknowns degree of smoothness of the solution for the stress. However, in addition to the solution for the velocity and the stress, it also yields information about the stress tensor, computed with an optimal accuracy. The scheme is demonstrated on two benchmark problems borrowed by other authors, and the results, although computed with a purely linear model look very similarly to the results of other authors that are based on a nonlinear neo-Hookean model.

关键词： fluid-structure interaction Stress formulation Splitting schemes

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An immersed interface-lattice Boltzmann method for fluid-structure interaction

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JOURNAL OF COMPUTATIONAL PHYSICS 2021年 428卷 109807-109807页

作者： Qin, Jianhua Kolahdouz, Ebrahim M. Griffith, Boyce E. Nanjing Univ Sci & Technol Key Lab Transit Phys Nanjing Jiangsu Peoples R China Univ N Carolina Dept Math Chapel Hill NC 27515 USA Univ N Carolina Dept Appl Phys Sci Chapel Hill NC 27515 USA Univ N Carolina Dept Biomed Engn Chapel Hill NC 27515 USA

An immersed interface-lattice Boltzmann method (II-LBM) is developed for modeling fluid-structure systems. The key element of this approach is the determination of the jump conditions that are satisfied by the distribution functions within the framework of the lattice Boltzmann method where forces are imposed along a surface immersed in an incompressible fluid. In this initial II-LBM, the discontinuity related to the normal component of the interfacial force is sharply resolved by imposing the relevant jump conditions using an approach that is analogous to imposing the corresponding pressure discontinuity in the incompressible Navier-Stokes equations. We show that the jump conditions for the distribution functions are the same in both single-relaxation-time and multi-relaxation-time LBM formulations. Tangential forces are treated using the immersed boundary-lattice Boltzmann method (IB-LBM). In our implementation, a level set approach is used to impose jump conditions for rigid-body models. For flexible boundary models, we describe the moving interface by interpolating the positions of marker points that move with the fluid. The II-LBM introduced herein is compared to a direct forcing IBLBM for rigid-body fluid-structure interaction, and a classical IB-LBM for cases involving elastic interfaces. Higher order accuracy is observed with the II-LBM as compared to the IB-LBM for selected benchmark problems. Although our II-LBM only imposes jump conditions corresponding to the pressure, the error in the velocity field is demonstrated to be much smaller for the II-LBM than the IB-LBM. The II-LBM is also demonstrated to provide superior volume conservation when simulating flexible boundaries. (c) 2020 Elsevier Inc. All rights reserved.

关键词： Immersed interface method Immersed boundary method Lattice Boltzmann method Jump conditions fluid-structure interaction

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