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fluid-structure interaction between pulsatile blood flow and a curved stented coronary artery on a beating heart: A four stent computational study

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2019年第Jun.15期350卷 679-700页

作者： Bukac, Martina Canic, Suncica Tambaca, Josip Wang, Yifan Univ Notre Dame Dept Appl & Computat Math & Stat Notre Dame IN 46556 USA Univ Calif Berkeley Dept Math Berkeley CA 94720 USA Univ Zagreb Dept Math Zagreb Croatia

This work focuses on fluid-structure interaction (FSI) between a curved (tortuous) coronary artery with an implanted stent, pulsatile blood flow, and heart contractions. The goal is to understand which geometric distribution of stent struts, given by four different, commercially available stent geometries, is least likely to be associated with parameters correlated with pathobiologic responses leading to restenosis, in the case of curved coronary arteries, whose curvature changes significantly with each heart contraction. The stent geometries considered in this study correspond to a Palmaz-like stent, an Express-like stent, a Cypher-like stent, and a Xience-like stent. The biomechanical environment induced by each implanted stent is evaluated in terms of displacement magnitude, Von Mises stress, normal stress experienced by the intimal layer with implanted stent, and wall shear stress. Arterial walls are modeled as multi-layered structures: the intimal layer with the internal elastic laminae is modeled as a nonlinearly elastic membrane, while the media-adventitia complex is modeled as a 3D linearly elastic material. The Navier-Stokes equations for an incompressible, viscous fluid, are used to model the blood flow. Full, two-way coupling between the fluid and the structure, and between the thin and thick structure, is considered. To include the effects of the force exerted by the pericardium and heart muscle contractions, external force is applied to the coronary artery walls. Pulsatile boundary conditions were imposed at the inlet and outlet of the coronary segment, approximating measured diastolic coronary flow. The presence of an implanted stent was modeled by its impact on the mass and elasticity properties of the intimal layer where the stent is located. The stent material is modeled as a 316L stainless steel. A novel, loosely coupled partitioned scheme combined with an ALE approach was used to solve this nonlinear FSI problem. It was found that the Cypher-like

关键词： fluid-structure interaction Curved coronary artery Coronary stent Loosely coupled partitioned scheme Arbitrary Lagrangian-Eulerian formulation

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fluid-structure interaction of spherical pressure hull implosion in deep-sea pressure: Experimental and numerical investigation

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OCEAN ENGINEERING 2024年 291卷

作者： Zheng, Jiancai Zhao, Min Shanghai Jiao Tong Univ Sch Naval Architecture State Key Lab Ocean Engn Ocean & Civil Engn Shanghai 200240 Peoples R China

Implosion may occur when a hollow pressure structure with geometric imperfections works in deep-sea environments. Therefore, the implosion phenomenon and failure mechanisms of a titanium alloy spherical pressure hull are investigated by experiments and developed numerical methods in ultra-high-pressure water conditions. Firstly, the experiments were conducted using a full-ocean-depth sea environment simulator. Then the validity of the numerical analysis were demonstrated by comparing the shock wave of fluid and destroyed fragments of structure. Finally, the characteristics of underwater implosion were examined under different hydrostatic pressures, including the propagation of shock waves, high-speed motion of the compressible flow, nonlinear deformation of the spherical pressure hull, and energy balance and evolution. The results showed that the vertical impact effect occurs during the underwater implosion of a metallic sphere. Moreover, the shock wave emerges earlier and the cracks break into smaller fragments with the increase of hydrostatic pressure. Besides, the smaller volume of the air cavity is compressed and the larger amplitude of potential energy is dropped when the hydrostatic pressure is larger. Meanwhile, the internal energy of air and structure increases, while the internal and kinetic energy of air oscillates slightly due to the pulsation characteristics of the air cavity.

关键词： fluid-structure interaction Underwater implosion Spherical pressure hull Deep-sea environment

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fluid-structure interaction-based aerodynamic modeling for flight dynamics simulation of parafoil system

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NONLINEAR DYNAMICS 2021年第4期104卷 3445-3466页

作者： Zhu, Hong Sun, Qinglin Liu, Xuefeng Liu, Jinglei Sun, Hao Wu, Wannan Tan, Panlong Chen, Zengqiang Nankai Univ Coll Artificial Intelligence Tianjin 300350 Peoples R China Beijing Inst Space Mech & Elect Beijing 100094 Peoples R China China Aerosp Sci & Technol Corp Lab Aerosp Entry Descent & Landing Technol Beijing 100094 Peoples R China Chinese Acad Sci Inst Mech Beijing 100190 Peoples R China

Prediction of aerodynamic force is a crucial issue for parafoil canopy as the strong nonlinear fluid-structure interaction (FSI) between the flexible canopy material and flow field. Flight tests and wind tunnel experiments are difficult to analyze the aerodynamics of parafoil because of the limitation and difficulty of data measurement in an unknown environment. The objective of this study was to computationally derive the aerodynamic characteristics of parafoil, as an alternative to expensive and unrepeatable test regimes. Different from previous works that assume canopy structure as a rigid body and serve for the design of parafoil, this study focused on the precise dynamic modeling of parafoil based on FSI simulations. To investigate the aerodynamic performance of the full-scale canopy with stabilizers for better control, the strong coupling FSI simulations were performed using the incompressible computational fluid dynamics techniques. The highlight of this paper is to explore the effects of canopy inflation and trailing edge deflections on aerodynamic performance. Then the aerodynamic coefficients are identified by a linear regression method using the obtained database of high fidelity lift and drag forces. Furthermore, an accurate six-degree-of-freedom dynamic model of the parafoil system is implemented based on the estimated coefficients. Simulations are conducted to prove the dynamic stability of the model and the feasibility of trajectory tracking. At last, simulation results of basic motions are compared with airdrop testing data, which demonstrates that the established model is capable of accurately predicting the flight behaviors of the parafoil system.

关键词： fluid-structure interaction Parafoil system Flexible deformation Trailing edge deflection Aerodynamic performance Dynamic model

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fluid-structure interaction modelling of nonlinear aeroelastic structures using the finite element corotational theory

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JOURNAL OF fluidS AND structureS 2006年第1期22卷 59-75页

作者： Relvas, A Suleman, A Univ Victoria Dept Mech Engn Victoria BC V8W 2Y2 Canada Inst Super Tecn IDMEC Dept Mech Engn P-1049001 Lisbon Portugal

The application of the finite element corotational theory to model geometric nonlinear structures within a fluid-structure interaction procedure is proposed. A dynamic corotational approximately-energy-conserving algorithm is used to solve the nonlinear structural response and it is shown that this algorithm's application with a four-node flat finite element is more stable than the nonlinear implicit Newmark method. This structural dynamic algorithm is coupled with the unsteady vortex-ring method using a staggered technique. These procedures were used to obtain aeroclastic results of a nonlinear plate-type wing subjected to low speed airflow. It is shown that stable and accurate numerical solutions are obtained using the proposed fluid-structure interaction algorithm. Furthermore, it is illustrated that geometric nonlinearities lead to limit cycle oscillations. (c) 2005 Elsevier Ltd. All rights reserved.

关键词： nonlinear aeroelasticity corotational fluid-structure interaction

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fluid-structure interaction in layered aortic arch aneurysm model: assessing the combined influence of arch aneurysm and wall stiffness

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AUSTRALASIAN PHYSICAL & ENGINEERING SCIENCES IN MEDICINE 2008年第1期31卷 32-41页

作者： Gao, F. Ohta, O. Matsuzawa, T. Japan Adv Inst Sci & Technology Ctr Informat Sci Nomi Ishikawa 9231292 Japan Aalborg Hosp Sch & Innovat Ctr Ctr Visceral Biomech & Pain Aalborg Denmark Japan Adv Inst Sci & Technology Grad Sch Informat Sci Nomi Ishikawa 9231292 Japan

The patients with aortic aneurysm, especially aortic arch aneurysm, are prone to have aortic dissection. For investigation of the effect of aneurysm and wall stiffness on wall stress distribution, both the nonaneurysm arch model and the aneurysm arch model are constructed. The fluid structure interaction in the arch model of aorta was implemented. The results show the stresses are much higher at inflection points in aneurysm model than in nonaneurysm model. and the stresses at media in stiffened wall are higher than in unstiffened wall. The high composite stress is located at inflection points and is much higher in aneurysm model. The arch aneurysm and wall stiffening are important determinants of peak wall stress in aortic wall.

关键词： fluid-structure interaction arch aneurysm wall stiffness

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fluid-structure interaction of a tensile fabric structure subjected to different wind speeds

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WIND AND structureS 2020年第6期31卷 533-548页

作者： Valdes-Vazquez, Jesus G. Garcia-Soto, Adrian D. Hernandez-Martinez, Alejandro Nava, Jose L. Univ Guanajuato Dept Civil Engn Av Juarez 77 Guanajuato 36000 GTO Mexico Univ Guanajuato Dept Geomat & Hydraul Engn Av Juarez 77 Guanajuato 36000 GTO Mexico

Despite the current technologic developments, failures in existent tensile fabric structures (TFS) subjected to wind do happen. However, design pressure coefficients are only obtained for large projects. Moreover, studies on TFSs with realistic supporting frames, comparing static and dynamic analyses and discussing the design implications, are lacking. In this study, fluid-structure analyses of a TFS supported by masts and inclined cables, by subjecting it to different wind speeds, are carried out, to gain more understanding in the above-referred aspects. Wind-induced stresses in the fabric and axial forces in masts and cables are assessed for a hypar by using computational fluid dynamics. Comparisons are carried out versus an equivalent static analysis and also versus loadings deemed representative for design. The procedure includes the so-called form-finding, a finite element formulation for the TFS and the fluid formulation. The selected structure is deemed realistic, since the supporting frame is included and the shape and geometry of the TFS are not uncommon. It is found that by carrying out an equivalent static analysis with the determined pressure coefficients, differences of up to 24% for stresses in the fabric, 5.4% for the compressive force in the masts and 21% for the tensile force in the cables are found with respect to results of the dynamic analysis. If wind loads commonly considered for design are used, significant differences are also found, specially for the reactions at the supporting frame. The results in this study can be used as an aid by designers and researchers.

关键词： tensile fabric structure fluid-structure interaction finite element simulation form-finding wind-induced forces

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fluid-structure interaction (FSI) analysis of stent-graft for aortic endovascular aneurysm repair (EVAR): Material and structural considerations

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JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 2018年 87卷 95-110页

作者： Jayendiran, Raja Nour, Bakr Ruimi, Annie Texas A&M Univ Qatar Mech Engn Program Doha Qatar Weill Cornell Med Qatar Doha Qatar

The effect of hemodynamic load on various stent-graft designs used for endovascular aneurysm repair (EVAR) in cardiovascular treatments is studied using a numerical fluid-structure interaction (FSI) analysis that couples computational fluid dynamics (CFD) and finite element analysis (FEA). Radial displacements, mechanical stresses, wall shear stress and wall compliance quantities are evaluated for four stent materials and one graft material. The strut thickness is varied from 0.3 mm to 1 mm. The materials are assumed linearly elastic and isotropic while blood is assumed as a Newtonian and incompressible medium with a pulsatile and turbulent flow profile. Time dependent pressure conditions are assumed at the inlet and outlet. Results are benchmarked against a study taken from the literature and indicate that the stent material and the strut thickness greatly influence the mechanical behavior of the structure. This computational study will serve as an additional tool to vascular surgeons when assessing the choice of material and design for stent-graft recipients.

关键词： Stent-graft fluid-structure interaction Endovascular repair Wall shear stress

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fluid-structure interaction study of a mixed-flow pump impeller during startup

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ENGINEERING COMPUTATIONS 2018年第1期35卷 18-34页

作者： Li, Wei Ji, Leilei Shi, Weidong Zhou, Ling Jiang, Xiaoping Zhang, Yang Jiangsu Univ Res Ctr Fluid Machinery Engn & Technol Zhenjiang Peoples R China

Purpose The purpose of this paper is to experimentally and numerically study the transient hydraulic impact and overall performance during startup accelerating process of mixed-flow pump. Design/methodology/approach In this study, the impeller rotor vibration characteristics during the starting period under the action of fluid-structure interaction was investigated, which is based on the bidirectional synchronization cooperative solving method for the flow field and impeller structural response of the mixed-flow pump. Experimental transient external characteristic and the transient dimensionless head results were compared with the numerical calculation results, to validate the accuracy of numerical calculation method. Besides, the deformation and dynamic stress distribution of the blade under the stable rotating speed and accelerating condition were studied based on the bidirectional fluid-structure interaction. Findings The results show that the combined action of complex hydrodynamic environment and impeller centrifugal force in the startup accelerating process makes the deformation and dynamic stress of blade have the rising trend of reciprocating oscillation. At the end of acceleration, the stress and strain appear as transient peak values and the transient effect is nonignorable. The starting acceleration has a great impact on the deformation and dynamic stress of blade, and the maximum deformation near the rim of impeller outlet edge increases 5 per cent above the stable condition. The maximum stress value increases by about 68.7 per cent more than the steady-state condition at the impeller outlet edge near the hub. The quick change of rotating speed makes the vibration problem around the blade tip area more serious, and then it takes the excessive stress concentration and destruction at the blade root. Originality/value This study provides basis and reference for the safety operation of pumps during starting period

关键词： Accelerating condition fluid-structure interaction Mixed-flow pump Transient deformation Transient dynamic stress

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fluid-structure interaction analysis of flexible flapping wing in the Martian environment

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ACTA ASTRONAUTICA 2022年 193卷 138-151页

作者： Kawakami, Kosuke Kaneko, Shigeki Hong, Giwon Miyamoto, Hideaki Yoshimura, Shinobu Univ Tokyo Sch Engn Dept Syst Innovat Bunkyo Ku 7-3-1 Hongo Tokyo 1138656 Japan Japan Aerosp Explorat Agcy 2-1-1 Sengen Tsukuba Ibaraki 3058505 Japan

Flapping-wing micro air vehicle (FWMAV) is an attractive idea for Mars exploration because of its high capability in a thin atmosphere. The biggest challenge for its development is an appropriate understanding of a flapping flight with flexible wings, which is significantly complicated because flexible flapping wings can undergo large-scale deformations due to the effects of wing inertia and the aerodynamic forces exerted by the surrounding atmosphere. fluid-structure interaction (FSI) analysis is a powerful tool for accurate investigations, but it usually has a very high computational cost, making it challenging to perform necessary parametric studies for practical designing. An efficient FSI analysis method is required. On Mars, whose atmospheric density is around 1% that of Earth, aerodynamic forces have a relatively small influence on wing deformation and may even be negligible in some cases. We thus investigate the relative contributions of the inertial force of a flapping wing and the aerodynamic forces exerted by the surrounding Martian atmosphere using a two-way coupled FSI simulation, and identify the conditions under which the aerodynamic forces are negligible. Then, we develop a computationally efficient one-way coupled FSI analysis system based on the interface-capturing method to design a flexible flapping wing for Mars exploration. Under the obtained conditions, we perform parametric studies on hovering flight with flexible flapping wings in the Martian environment with multiple aerodynamic parameters, various kinematic parameters, and material properties of the wing. We conclude that an FWMAV with a payload of around 5 g can fly for more than 1 min for the maximum density of the Martian atmosphere.

关键词： Flapping wing fluid-structure interaction Two-way coupling One-way coupling Mars

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fluid-structure interaction effects in the dynamic response of free-standing plates to uniform shock loading

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JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 2007年第5期74卷 1042-1045页

作者： Kambouchev, Nayden Radovitzky, Raul Noels, Ludovic MIT Dept Aeronaut & Astronaut Cambridge MA 02139 USA Univ Liege Inst Astrophys LTAS Milieux Continus & Thermomecanique B-4000 Cointe Ougree Belgium

The problem of uniform shocks interacting with free-standing plates is studied analytically and numerically for arbitrary shock intensity and plate mass. The analysis is of interest in the design and interpretation of fluid-structure interaction (FSI) experiments in shock tubes. In contrast to previous work corresponding to the case of incident blast profiles of exponential distribution, all asymptotic limits obtained here are exact. The contributions include the extension of Taylor's FSI analysis for acoustic waves, the exact analysis of the asymptotic limits of very heavy and very light plates for arbitrary shock intensity, and a general formula for the transmitted impulse. in the intermediate plate mass range. One of the implications is that the impulse transmitted to the plate can be expressed univocally in terms of a single nondimensional compressible FSI parameter.

关键词： uniform shock waves fluid-structure interaction

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