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fluid-structure interaction with NURBS-based coupling

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2018年 332卷 520-539页

作者： Hosters, Norbert Helmig, Jan Stavrev, Atanas Behr, Marek Elgeti, Stefanie Rhein Westfal TH Aachen Ctr Computat Engn Sci Chair Computat Anal Tech Syst CATS D-52056 Aachen Germany

Engineering design via CAD software relies on Non-Uniform Rational B-Splines (NURBS) as a means for representing and communicating geometry. Therefore, in general, a NURBS description of a given design can be considered the exact description. The development of isogeometric methods has made the geometry available to analysis methods Hughes et al. (2005). Isogeometric analysis has been particularly successful in structural analysis;one reason being the wide-spread use of two-dimensional finite elements in this field. For fluid dynamics, where three-dimensional analysis is usually indispensable, isogeometric methods are more complicated, yet of course not impossible, to apply in a general fashion. This paper describes a method that enables the solution of fluid-structure-interaction with a matching spline description of the interface. On the structural side, the spline is used in an isogeometric setting. On the fluid side, the same spline is used in the framework of a NURBS-enhanced finite element method (extension of Sevilla et al. (2011)). The coupling of the structural and the fluid solution is greatly facilitated by the common spline interface. The use of the identical spline representation for both sides permits a direct transfer of the necessary quantities, all the while still allowing an adjusted, individual refinement level for both sides. (C) 2018 Elsevier B.V. All rights reserved.

关键词： Non-uniform rational B-splines Isogeometric analysis NURBS-enhanced finite element method fluid-structure interaction

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fluid-structure interaction modeling of a patient-specific cerebral aneurysm: influence of structural modeling

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COMPUTATIONAL MECHANICS 2008年第1期43卷 151-159页

作者： Torii, Ryo Oshima, Marie Kobayashi, Toshio Takagi, Kiyoshi Tezduyar, Tayfun E. Univ London Imperial Coll Sci Technol & Med Dept Chem Engn London SW7 2AZ England Univ Tokyo Inst Ind Sci Tokyo 1538505 Japan Japan Automobile Res Inst Tsukuba Ibaraki 3050822 Japan Fujita Hlth Univ Dept Neurosurg Toyoake Aichi 4701192 Japan Rice Univ Houston TX 77005 USA

fluid-structure interaction (FSI) simulations of a cerebral aneurysm with the linearly elastic and hyper-elastic wall constitutive models are carried out to investigate the influence of the wall-structure model on patient-specific FSI simulations. The maximum displacement computed with the hyper-elastic model is 36% smaller compared to the linearly elastic material model, but the displacement patterns such as the site of local maxima are not sensitive to the wall models. The blood near the apex of an aneurysm is likely to be stagnant, which causes very low wall shear stress and is a factor in rupture by degrading the aneurysmal wall. In this study, however, relatively high flow velocities due to the interaction between the blood flow and aneurysmal wall are seen to be independent of the wall model. The present results indicate that both linearly elastic and hyper-elastic models can be useful to investigate aneurysm FSI.

关键词： fluid-structure interaction cerebral aneurysm patient-specific modeling structural model

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fluid-structure interaction: Application to structures in an acoustic fluid medium .1. An introduction to numerical treatment

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ENGINEERING COMPUTATIONS 1995年第8期12卷 749-758页

作者： Hamdan, FH Dowling, PJ Department of Civil Engineering Imperial College of Science Technology and Medicine London U.K. Department of Civil Engineering Imperial College of Science Technology and Medicine London U.K.

This paper is concerned with the treatment of fluid-structure interaction problems. The paper is divided in a number of sections. The first is an introduction to the historical background which lead to the numerical approach being used today. In the second the main factors affecting the numerical treatment of fluid-structure interaction problems are identified. The next eight sections discuss each of these factors separately. Conclusions are drawn in section eleven.

关键词： fluid-structure interaction Lagrangian Eulerian mixed-Eulerian-Lagrangian plane wave approximation doubly asymptotic approximation

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fluid-structure interaction in aortic cross-clamping: Implications for vessel injury

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JOURNAL OF BIOMECHANICS 2010年第2期43卷 221-227页

作者： Chen, Henry Y. Navia, Jose A. Shafique, Shoaib Kassab, Ghassan S. Indiana Univ Purdue Univ Dept Biomed Engn Indianapolis IN 46202 USA Purdue Univ Weldon Sch Biomed Engn W Lafayette IN 47907 USA Austral Univ Dept Cardiovasc Surg RA-1011 Buenos Aires DF Argentina Indiana Univ Purdue Univ Dept Cellular & Integrat Physiol Indianapolis IN 46202 USA Indiana Univ Purdue Univ Indiana Ctr Vasc Biol & Med Indianapolis IN 46202 USA

Vascular cross-clamping is applied in many cardiovascular surgeries Such as coronary bypass, aorta repair and valve procedures. Experimental studies have found that clamping Of Various degrees Caused damage to arteries. This Study examines the effects Of popular clamps Oil vessel wall. Models of the aorta and clamp were created in Computer Assisted Design and Finite Element Analysis packages. The vessel wall was considered as a non-linear anisotropic material while the fluid Was Simulated as Newtonian with pulsatile flow. The clamp was applied through displacement time function. Fully Coupled two-way solid-fluid interaction models were developed. It was found that the clamp design significantly affected the stresses in vessel wall. The clamp with a protrusion feature increased the overall Von Mises stress by about 60% and the compressive Stress by more than 200%. Interestingly, when the protrusion clamp was applied, the Von Mises stress at the lumen (endothelium) side of artery wall was about twice that of the Outer wall. This ratio was much higher than that of the plate-like clamp which was about 1.3. The flow reversal process was demonstrated luting clamping. Vibrations, flow and wall shear stress oscillations were detected immediately before total vessel Occlusion. The commonly Used protrusion clamp increased stresses ill vessel wall, especially the compressive stress. This design also significantly increased the stresses on endothelium, detrimental to vessel health. The present findings are relevant to Surgical clamp design as well as the transient mechanical loading on the endothelium and potential injury. The deformation and stress analysis may provide Valuable insights into the mode Of tissue injury during cross-clamping. (C) 2009 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Surgical clamp designs Intramural wall stress Wall shear stress Endothelium

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fluid-structure interaction problem of hydrodynamic motion of an independent escape capsule under variable constraint conditions

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OCEAN ENGINEERING 2019年 187卷 106198-000页

作者： Zhang, Lei Kong, Bin Lin, Shiyao Wang, Chizhong Xie, De Sun, Jianglong Huazhong Univ Sci & Technol Sch Naval Architecture & Ocean Engn 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China Wuhan Second Ship Design & Res Inst Wuhan 430064 Hubei Peoples R China Univ Washington Dept Aeronaut & Astronaut Seattle WA 98195 USA Zhejiang Univ Ocean Coll Hangzhou 310058 Zhejiang Peoples R China Collaborat Innovat Ctr Adv Ship & Deep Sea Explor Shanghai 200240 Peoples R China Huazhong Univ Sci & Technol Hubei Key Lab Naval Architecture & Ocean Engn Hyd 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China

Hydrodynamic behavior of an independent escape capsule from a disabled submarine is a complex six-degrees-of-freedom motion, in which added-mass effect is strong and variable constraint conditions happen. In this paper, loosely (or weakly) coupled scheme is adopted to solve this fluid-structure interaction problem. Flow field is simulated by Fluent (version 13.0.1) and motion equations are solved by the fourth-order Runge-Kutta method separately. Unstructured dynamic mesh technology is used to trace the trajectory of capsule. Hydrodynamic force is decomposed into resistance and added mass force, and new motion equations are derived in order to handle the huge added mass. The surfaces of capsule and its chamber come into contact randomly. The variable constraint conditions are analyzed and their corresponding kinematical equations are introduced. This loosely coupled scheme is applied to study the hydrodynamic behavior of a two-dimensional capsule from a narrow space into an open domain under different ocean currents. Hydrodynamic force, motion characteristics and trajectory are obtained. The simulation indicates that the velocity and direction of flow strongly affect the motion of capsule, and the contact force leads to the jamming problem of capsule during its ejection process.

关键词： fluid-structure interaction Hydrodynamic motion Added-mass effect Various constraint conditions Independent escape capsule

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fluid-structure interaction computational analysis and experiments of tsunami bore forces on coastal bridges

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INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & fluid FLOW 2021年第5期31卷 1373-1395页

作者： Mazinani, Iman Sarafraz, Mohammad Mohsen Ismail, Zubaidah Hashim, Ahmad Mustafa Safaei, Mohammad Reza Wongwises, Somchai Univ Malaya Dept Civil Engn Kuala Lumpur Malaysia Univ Adelaide Sch Mech Engn Adelaide SA Australia Univ Teknol Petronas Dept Civil & Environm Engn Seri Iskandar Perak Malaysia King Abdulaziz Univ Dept Mech Engn Fac Engn Jeddah Saudi Arabia China Med Univ Dept Med Res China Med Univ Hosp Taichung Taiwan King Mongkuts Univ Technol Thonburi KMUTT Dept Mech Engn Fac Engn Bangkok Thailand Natl Sci & Technol Dev Agcy NSTDA Pathum Thani Thailand

Purpose Two disastrous Tsunamis, one on the west coast of Sumatra Island, Indonesia, in 2004 and another in North East Japan in 2011, had seriously destroyed a large number of bridges. Thus, experimental tests in a wave flume and a fluid structure interaction (FSI) analysis were constructed to gain insight into tsunami bore force on coastal bridges. Design/methodology/approach Various wave heights and shallow water were used in the experiments and computational process. A 1:40 scaled concrete bridge model was placed in mild beach profile similar to a 24 x 1.5 x 2 m wave flume for the experimental investigation. An Arbitrary Lagrange Euler formulation for the propagation of tsunami solitary and bore waves by an FSI package of LS-DYNA on high-performance computing system was used to evaluate the experimental results. Findings The excellent agreement between experiments and computational simulation is shown in results. The results showed that the fully coupled FSI models could capture the tsunami wave force accurately for all ranges of wave heights and shallow depths. The effects of the overturning moment, horizontal, uplift and impact forces on a pier and deck of the bridge were evaluated in this research. Originality/value Photos and videos captured during the Indian Ocean tsunami in 2004 and the 2011 Japan tsunami showed solitary tsunami waves breaking offshore, along with an extremely turbulent tsunami-induced bore propagating toward shore with significantly higher velocity. Consequently, the outcomes of this current experimental and numerical study are highly relevant to the evaluation of tsunami bore forces on the coastal, over sea or river bridges. These experiments assessed tsunami wave forces on deck pier showing the complete response of the coastal bridge over water.

关键词： fluid-structure interaction Tsunami Arbitrary Lagrange Euler Coastal bridge Bore forces

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fluid-structure interaction assessment of blood flow hemodynamics and leaflet stress during mitral regurgitation

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COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING 2019年第3期22卷 288-303页

作者： Esfahani, Saeed Adham Hassani, Kamran Espino, Daniel M. Islamic Azad Univ Majlesi Branch Mech Engn Dept Esfahan Iran Islamic Azad Univ Sci & Res Branch Dept Biomech Tehran Iran Univ Birmingham Dept Mech Engn Birmingham W Midlands England

The aim of this study is to simulate the Mitral Regurgitation (MR) disease progression from mild to severe intensity. A fluid structure interaction (FSI) model was developed to extract the hemodynamic parameters of blood flow in mitral regurgitation (MR) during systole. A two-dimensional (2D) geometry of the mitral valve was built based on the data resulting from Magnetic Resonance Imaging (MRI) dimensional measurements. The leaflets were assumed to be elastic. Using COMSOL software, the hemodynamic parameters of blood flow including velocity, pressure, and Von Mises stress contours were obtained by moving arbitrary Lagrange-Euler mesh. The results were obtained for normal and MR cases. They showed the effects of the abnormal distance between the leaflets on the amount of returned flow. Furthermore, the deformation of the leaflets was measured during systole. The results were found to be consistent with the relevant literature.

关键词： fluid-structure interaction hemodynamics mitral regurgitation systole

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fluid-structure interaction modeling with nonmatching interface discretizations for compressible flow problems: simulating aircraft tail buffeting

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COMPUTATIONAL MECHANICS 2024年第2期74卷 367-377页

作者： Rajanna, Manoj R. Jaiswal, Monu Johnson, Emily L. Liu, Ning Korobenko, Artem Bazilevs, Yuri Lua, Jim Phan, Nam Hsu, Ming-Chen Global Engn & Mat Inc Princeton NJ 08540 USA Iowa State Univ Dept Mech Engn Ames IA 50011 USA Univ Notre Dame Dept Aerosp & Mech Engn Notre Dame IN 46556 USA Univ Calgary Dept Mech & Mfg Engn Calgary AB T2N 1N4 Canada Brown Univ Sch Engn Providence RI 02912 USA Naval Air Syst Command NAVAIR Struct Div Patuxent River MD 20670 USA

Many aerospace applications involve complex multiphysics in compressible flow regimes that are challenging to model and analyze. fluid-structure interaction (FSI) simulations offer a promising approach to effectively examine these complex systems. In this work, a fully coupled FSI formulation for compressible flows is summarized. The formulation is developed based on an augmented Lagrangian approach and is capable of handling problems that involve nonmatching fluid-structure interface discretizations. The fluid is modeled with a stabilized finite element method for the Navier-Stokes equations of compressible flows and is coupled to the structure formulated using isogeometric Kirchhoff-Love shells. To solve the fully coupled system, a block-iterative approach is used. To demonstrate the framework's effectiveness for modeling industrial-scale applications, the FSI methodology is applied to the NASA Common Research Model (CRM) aircraft to study buffeting phenomena by performing an aircraft pitching simulation based on a prescribed time-dependent angle of attack.

关键词： fluid-structure interaction Compressible flow Isogeometric shell Nonmatching interface Aircraft buffeting NASA Common Research Model

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fluid-structure interaction analysis of the left coronary artery with variable angulation

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COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING 2015年第14期18卷 1500-1508页

作者： Dong, Jingliang Sun, Zhonghua Inthavong, Kiao Tu, Jiyuan RMIT Univ PTRI Sch Aerosp Mech & Mfg Engn Bundoora Vic 3083 Australia Curtin Univ Dept Imaging & Appl Phys Discipline Med Imaging Perth WA 6845 Australia

The aim of this study is to elucidate the correlation between coronary artery branch angulation, local mechanical and haemodynamic forces at the vicinity of bifurcation. Using a coupled fluid-structure interaction (FSI) modelling approach, five idealized left coronary artery models with various angles ranging from 70 degrees to 110 degrees were developed to investigate the influence of branch angulations. In addition, one CT image-based model was reconstructed to further demonstrate the medical application potential of the proposed FSI coupling method. The results show that the angulation strongly alters its mechanical stress distribution, and the instantaneous wall shear stress distributions are substantially moderated by the arterial wall compliance. As high tensile stress is hypothesized to cause stenosis, the left circumflex side bifurcation shoulder is indicated to induce atherosclerotic changes with a high tendency for wide-angled models.

关键词： wall shear stress left coronary artery tensile stress arterial wall compliance branch angulation fluid-structure interaction

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fluid-structure interaction mechanisms for close-in explosions

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SHOCK AND VIBRATION 2000年第5期7卷 265-275页

作者： Wardlaw, AB Luton, JA USN Ctr Surface Warfare Indian Head Div Warhead Dynam Div Indian Head MD 20640 USA

This paper examines fluid-structure interaction for close-in internal and external underwater explosions. The resulting flow field is impacted by the interaction between the reflected explosion shock and the explosion bubble. This shook reflects off the bubble as an expansion that reduces the pressure level between the bubble and the target, inducing cavitation and its subsequent collapse that reloads the target. Computational examples of several close-in interaction cases are presented to document the occurrence of these mechanisms. By comparing deformable and rigid body simulations, it is shown that cavitation collapse can occur solely from the shock-bubble interaction without the benefit of target deformation. Addition of a deforming target lowers the flow field pressure, facilitates cavitation and cavitation collapse, as well as reducing the impulse of the initial shock loading.

关键词： fluid-structure interaction UNDERWATER explosions SHOCK (Mechanics)

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