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fluid-structure interaction modelling of a PWR fuel assembly subjected to axial flow

JOURNAL OF fluidS AND structureS 2016年第0期62卷 156-171页

作者： Ricciardi, Guillaume CEA CADARACHE DEN DTN STCPLHC F-13108 St Paul Les Durance France

Nuclear industry needs tools to design reactor cores in case of earthquake. A fluid-structure model simulating the response of the core to a seismic excitation has been developed. Full scale tests considering one fuel assembly are performed to identify coefficients (added mass and damping) that will be used as inputs in the models. Tests showed that the axial water flow induced an added stiffness. In the paper, an expression of the model accounting for the fluid in the fuel assembly with a porous media model and in the by-passes with a leakage flow model is developed. Numerical simulations are compared to experiments and showed good agreement. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Fuel assembly Modelling fluid-structure interaction Added stiffness

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fluid-structure interaction ANALYSIS OF WALL STRESS AND FLOW PATTERNS IN A THORACIC AORTIC ANEURYSM

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INTERNATIONAL JOURNAL OF APPLIED MECHANICS 2009年第1期1卷 179-199页

作者： Tan, F. P. P. Torii, R. Borghi, A. Mohiaddin, R. H. Wood, N. B. Xu, X. Y. Univ London Imperial Coll Sci Technol & Med Dept Chem Engn London SW7 2AZ England Royal Brompton & Harefield NHS Trust London SW3 6NP England Univ London Imperial Coll Sci Technol & Med Natl Heart & Lung Inst London SW3 6LY England

In this study, fluid-structure interaction (FSI) simulation was carried out to predict wall shear stress (WSS) and blood flow patterns in a thoracic aortic aneurysm (TAA) where haemodynamic stresses on the diseased aortic wall are thought to lead to the growth, progression and rupture of the aneurysm. Based on MR images, a patient-specific TAA model was reconstructed. A newly developed two-equation laminar-turbulent transitional model was employed and realistic velocity and pressure waveforms were used as boundary conditions. Analysis of results include turbulence intensity, wall displacement, WSS, wall tensile stress and comparison of velocity profiles between MRI data, rigid and FSI simulations. Velocity profiles demonstrated that the FSI simulation gave better agreement with the MRI data while results for the time-averaged WSS (TAWSS) and oscillatory shear index (OSI) distributions showed no qualitative differences between the simulations. With the FSI model, the maximum TAWSS value was 13% lower, whereas the turbulence intensity was significantly higher than the rigid model. The FSI simulation also provided results for wall mechanical stress in terms of von Mises stress, allowing regions of high wall stress to be identified.

关键词： fluid-structure interaction thoracic aortic aneurysm wall shear stress computational fluid dynamics turbulent-transition modelling

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fluid-structure interaction modeling and performance analysis of the Orion spacecraft parachutes

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN fluidS 2011年第1-3期65卷 271-285页

作者： Takizawa, Kenji Moorman, Creighton Wright, Samuel Spielman, Timothy Tezduyar, Tayfun E. Rice Univ Team Adv Flow Simulat & Modeling T AFSM Houston TX 77005 USA

We focus on fluid-structure interaction (FSI) modeling and performance analysis of the ringsail parachutes to be used with the Orion spacecraft. We address the computational challenges with the latest techniques developed by the T star AFSM (Team for Advanced Flow Simulation and Modeling) in conjunction with the SSTFSI (Stabilized Space-Time fluid-structure interaction) technique. The challenges involved in FSI modeling include the geometric porosity of the ringsail parachutes with ring gaps and sail slits. We investigate the performance of three possible design configurations of the parachute canopy. We also describe the techniques developed recently for building a consistent starting condition for the FSI computations, discuss rotational periodicity techniques for improving the geometric-porosity modeling, and introduce a new version of the HMGP (Homogenized Modeling of Geometric Porosity). Copyright (C) 2010 John Wiley & Sons, Ltd.

关键词： Orion spacecraft ringsail parachute geometric porosity design configurations fluid-structure interaction periodic four-gore model space-time finite elements

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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 in a pre-stressed tube with thick elastic walls I: the stationary Stokes problem

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NETWORKS AND HETEROGENEOUS MEDIA 2007年第3期2卷 396-423页

作者： Mikelic, Andro Guidoboni, Giovanna Canic, Suncica Univ Lyon F-69003 Lyon France Univ Lyon 1 Inst Camille Jordan UFR Math F-69367 Lyon 07 France Univ Houston Dept Math Houston TX 77204 USA

This is a study of the fluid-structure interaction between the stationary Stokes flow of an incompressible, Newtonian viscous fluid filling a three-dimensional, linearly elastic, pre-stressed hollow tube. The main motivation comes from the study of blood flow in human arteries. Most literature on fluid-structure interaction in blood flow utilizes thin structure models (shell or membrane) to describe the behavior of arterial walls. However, arterial walls are thick, three-dimensional structures with the wall thickness comparable to the vessel inner radius. In addition, arteries in vivo exhibit residual stress: when cut along the radius, arteries spring open releasing the residual strain. This work focuses on the implications of the two phenomena on the solution of the fluid-structure interaction problem, in the parameter regime corresponding to the blood flow in medium-to-large human arteries. In particular, it is assumed that the aspect ratio of the cylindrical structure epsilon = R/L is small. Using asymptotic analysis and ideas from homogenization theory for porous media flows, an effective, closed model is obtained in the limit as both the thickness of the vessel wall and the radius of the cylinder approach zero, simultaneously. The effective model satisfies the original three-dimensional, axially symmetric problem to the epsilon(2)-accuracy. Several novel properties of the solution are obtained using this approach. A modification of the well-known "Law of Laplace" is derived, holding for thick elastic cylinders. A calculation of the effective longitudinal displacement is obtained, showing that the leading-order longitudinal displacement is completely determined by the external loading. Finally, it is shown that the residual stress influences the solution only at the epsilon-order. More precisely, it is shown that the only place where the residual stress influences the solution of this fluid-structure interaction problem is in the calculation of the epsilon-corre

关键词： fluid-structure interaction three-dimensional elastic walls blood flow compliant tube

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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 of prismatic line-like structures, using LES and block-iterative coupling

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JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS 2008年第6-7期96卷 840-858页

作者： Sun, Dongke Owen, John S. Wright, Nigel G. Liaw, Kai Fan Univ Nottingham Sch Civil Engn Nottingham NG7 2RD England Dalian Univ Technol Dept Engn Mech Dalian 116023 Peoples R China

The design of long-span bridges to resist wind loading often requires wind tunnel testing of sectional or full aeroelastic models. Recently, efforts have been made to realise a reliable computational alternative to these physical tests. In the current work, a novel computational scheme for fluid-structure interaction (FSI) is presented. Large eddy simulation (LES) for 3D viscous turbulent incompressible flow has been coupled to the response of prismatic line-like structures. LES is chosen because of the inherent unsteadiness in FSI problems and the capability of LES to maintain the turbulence structure in the flow, in contrast to the over-dissipativeness of the traditional Reynolds averaged Navier-Stokes equations (RANS)-based turbulence models. A Gauss-Seidel-type block-iterative algorithm is adopted to address both the field coupling and the non-linearity simultaneously. At global convergence, this gives solutions identical to those obtained using direct coupling, but with field modularity preserved, storage requirements well under control and computational effort significantly reduced. Numerical examples are presented for elastically supported rigid circular and rectangular cylinders (sectional model tests);the method is readily extendable to flexible structures (full aeroelastic models) via modal analysis. (c) 2007 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction prismatic structure large eddy simulation modal analysis

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fluid-structure interaction Analysis of a Fabric Skin for Fabric-Covered Wind Turbine Blades

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INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES 2022年第1期23卷 92-101页

作者： Choi, Dong-Kuk An, Hyung-Ju Lee, Soo-Yong Bae, Jae-Sung Korea Aerosp Univ Sch Aerosp & Mech Engn 76 Hanggongdaehak Ro Goyang Si 10540 Gyeonggi Do South Korea

Wind turbines are becoming larger to produce more power from the wind in a given area. While the large-size wind turbines are advantageous in terms of generating power, the blades are very heavy and difficult to transport and install. General Electric Co. and the National Renewable Energy Laboratory proposed a new blade design and manufacturing concept that covers the blade with tensioned fabrics. This fabric-covered wind turbine blade is composed of spar-rib structures and covering fabric skins. The present study investigates the aerodynamic effects of fabric skin. A fluid-structure interaction (FSI) analysis was performed about the fabric skin of a large-sized fabric-covered blade. Through static and dynamic FSI analyses, the response of the fabric skin was analyzed according to the wind speeds. The natural frequencies and mode shapes were compared. It was confirmed that the tension of the fabric skin should be increased as much as possible to maintain aerodynamic efficiency, and in addition that the natural frequencies and mode shapes were changed by the wind speeds.

关键词： Wind turbine Blade Fabric-covered blade Membrane structure Fabric skin fluid-structure interaction

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fluid-structure interaction simulation of aortic blood flow by ventricular beating: a preliminary model for blunt aortic injuries in vehicle crashes

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INTERNATIONAL JOURNAL OF CRASHWORTHINESS 2020年第3期25卷 299-306页

作者： Wei, Wei Kahn, Cyril J. F. Behr, Michel Aix Marseille Univ IFSTTAR Marseille France

Blunt aortic injuries are common and severe in motor vehicle crash accidents (MVCAs), but the injury mechanisms, which can be categorised as kinematics and hydrodynamics aspects, remain to be uncertain. In this study, a finite element model was developed for the aorta-heart system with fluid-structure interaction methods, aimed to study both kinds of mechanisms simultaneously. The aortic blood flow was generated by simulating left ventricle contraction. This model was further integrated with a human body model to reconstruct a real car crash case. The aorta-heart model was validated against ventricular volume, blood pressure, velocity, flow rate and wall shear stress. The integrated model predicted aorta isthmus laceration and other injuries consistent with the case injury reports. The cardiac output during the accident was more intense than the physiological output, proving the ability of current simulation approach to capture the blood flow modification by the thoracic compressive loadings during accidents.

关键词： Aortic injury left ventricle contraction fluid-structure interaction fluid dynamics motor vehicle crash accidents

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fluid-structure interaction in crash simulation

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING 2000年第D7期214卷 669-673页

作者： Meywerk, M Decker, F Cordes, J Volkswagen AG CAE Methods D-38436 Wolfsburg Germany Volkswagen AG Transporter Dev Safety Wolfsburg Germany

In the automotive industry crash simulation plays an important role in decreasing development costs and in improving cars. To increase the reliability of crash simulation the modelling of parts of vehicles, which has been neglected in the past, becomes more important. One of these parts is the fuel tank together with the fuel inside the tank. An important aspect of a fuel tank in crash simulation is its kinematic behaviour as a result of the interaction with the fuel. To obtain good results in the simulation it is necessary to take into consideration the fluid properties of the fuel. The ability of crash simulation software to model fluid-structure interaction including free surfaces has been limited until now. Therefore, it is helpful to obtain some insight into modelling capabilities and to compare them with other sophisticated simulation techniques. In this paper three modelling techniques for fluid-structure interaction of fluids with free surfaces are presented. These results are compared with an experiment. It is shown that the simplest modelling technique is precise enough for reliable crash simulations.

关键词： fluid-structure interaction smooth particle hydrodynamics volume of fluid crash simulation

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