检索结果-内蒙古大学图书馆

Nonlinear fluid-structure interaction calculation of the leakage behaviour of cracked concrete walls

NUCLEAR ENGINEERING AND DESIGN 2009年第9期239卷 1628-1640页

作者： Niklasch, Christoph Herrmann, Nico Ed Zublin AG Tech Head Off Tunnel Engn Dept D-70567 Stuttgart Germany Univ Karlsruhe TH Mat Testing & Res Inst MPA Karlsruhe D-76128 Karlsruhe Germany

In the case of severe accidents in nuclear power plants, containments are the last barrier to prevent the release of environmentally hazardous substances. Therefore, the leaktightness of the containment is of decisive importance for the safety and protection of the environment in case of an accident. A numerical model based on the Finite Element Method has been developed to calculate the leakage behaviour of reinforced concrete walls. Leakage flow and structural response are solved iteratively. For the calculation of the leakage flow a fluid model has been used which takes into account the condensation of the steam part within the air-steam mixture. Both, the release of the latent heat in the case of condensation and the following two-phase flow of air and water have been considered, too. Tests with the SIMIBE Experimental facility [Caroli, C., Coulon, N., Renson, C., 1995. Steam leakage through concrete cracks: parametric study with SIMIBE experiment and interpretation of the results. Tech. Rep. Commissariat A L'Energie Atomique (CEA)] are used for verification of the condensation and two-phase flow models. (C) 2008 Elsevier B.V. All rights reserved.

关键词： NONLINEAR systems fluid-structure interaction CONCRETE walls NUCLEAR power plants RADIOACTIVE wastes HAZARDOUS substances NUCLEAR accidents FINITE element method ITERATIVE methods (Mathematics)

来源：评论

学校读者我要写书评

暂无评论

A comparison of FE-BE coupling schemes for large-scale problems with fluid-structure interaction

引用

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2009年第5期77卷 664-688页

作者： Brunner, Dominik Junge, Michael Gaul, Lothar Univ Stuttgart Inst Appl & Expt Mech D-70550 Stuttgart Germany

To predict the sound radiation of structures, both a structural problem and an acoustic problem have to be solved. In case of thin structures and dense fluids, a strong coupling scheme between the two problems is essential, since the feedback of the acoustic pressure onto the structure is not negligible. In this paper, the structural part is modeled with the finite element (FE) method. An interface to a commercial FE package is set up to import the structural matrices. The exterior acoustic problem is efficiently modeled with the Galerkin boundary element (BE) method. To overcome the well-known drawback of fully populated system matrices, the fast multipole method is applied. Different coupling formulations are investigated. They are either based on the Burton-Miller approach or use a mortar coupling scheme. For all cases, iterative solvers with different preconditioners are used. The efficiency with respect to their memory consumption and computation time is compared for a simple model problem. At the end of the paper, a more complex structure is simulated. Copyright (c) 2008 John Wiley & Sons, Ltd.

关键词： fluid-structure interaction multipole boundary element method FE-BE coupling iterative solvers mortar coupling

来源：评论

学校读者我要写书评

暂无评论

High-Fidelity Tetrahedral Mesh Generation from Medical Imaging Data for fluid-structure interaction Analysis of Cerebral Aneurysms

引用

CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES 2009年第2期42卷 131-149页

作者： Zhang, Yongjie Wang, Wenyan Liang, Xinghua Bazilevs, Yuri Hsu, Ming-Chen Kvamsdal, Trond Brekken, Reidar Isaksen, Jorgen Carnegie Mellon Univ Dept Mech Engn Pittsburgh PA 15213 USA Univ Calif San Diego Dept Struct Engn San Diego CA 92103 USA SINTEF Informat & Commun Technol Dept Appl Math Trondheim Norway SINTEF Hlth Res Dept Med Technol Trondheim Norway Univ Hosp N Norway Dept Neurosurg Tromso Norway

This paper describes a comprehensive and high-fidelity finite element meshing approach for patient-specific arterial geometries from medical imaging data, with emphasis on cerebral aneurysm configurations. The meshes contain both the blood volume and solid arterial wall, and are compatible at the fluid-solid interface. There are four main stages for this meshing method: 1) Image segmentation and geometric model construction;2) Tetrahedral mesh generation for the fluid volume using the octree-based method;3) Mesh quality improvement stage, in which edge-contraction, pillowing, optimization, geometric flow smoothing, and mesh cutting are applied to the fluid mesh;and 4) Mesh generation for the blood vessel wall based on the boundary layer generation technique. The constructed meshes are extensively employed in a fully-coupled fluid-structure interaction analysis of vascular blood flow. This paper presents several case studies of hemodynamics in patient-specific cerebral aneurysms.

关键词： Tetrahedral meshing fluid-structure interaction cerebral aneurysm

来源：评论

学校读者我要写书评

暂无评论

Validation of a numerical 3-D fluid-structure interaction model for a prosthetic valve based on experimental PIV measurements

引用

MEDICAL ENGINEERING & PHYSICS 2009年第8期31卷 986-993页

作者： Guivier-Curien, Carine Deplano, Valerie Bertrand, Eric IRPHE Equipe Biomecan Cardiovasc UMR 6594 F-13384 Marseille 13 France

A numerical 3-D fluid-structure interaction (FSI) model of a prosthetic aortic valve was developed, based on a commercial computational fluid dynamics (CFD) software program using an Arbitrary Eulerian Lagrangian (ALE) formulation. To make sure of the validity of this numerical model, an equivalent experimental model accounting for both the geometrical features and the hydrodynamic conditions was also developed. The leaflet and the flow behaviours around the bileaflet valve were investigated numerically and experimentally by performing particle image velocimetry (PIV) measurements. Through quantitative and qualitative comparisons, it was shown that the leaflet behaviour and the velocity fields were similar in both models. The present study allows the validation of a fully coupled 3-D FSI numerical model. The promising numerical tool could be therefore used to investigate clinical issues involving the aortic valve. (C) 2009 IPEM. Published by Elsevier Ltd. All rights reserved

关键词： Bileaflet prosthetic valve fluid-structure interaction Particle image velocimetry

来源：评论

学校读者我要写书评

暂无评论

Blast response simulation of an elastic structure: Evaluation of the fluid-structure interaction effect

引用

INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 2009年第7期36卷 965-974页

作者： Subramaniam, Kolluru V. Nian, Weimin Andreopoulos, Yiannis CUNY City Coll Dept Civil Engn New York NY 10031 USA CUNY City Coll Dept Mech Engn New York NY 10031 USA

Blast pressure wave interaction with an elastic structure is investigated using a numerical analysis approach, which considers fluid-structure interaction (FSI) within an Arbitrary Lagrange Euler (ALE) framework. Approximate numerical procedures for solving the Riemann problem associated with the shock are implemented within the Godunov finite volume scheme for the fluid domain. The structural displacement predicted by ignoring FSI is larger than the corresponding displacement considering FSI. The influence of the structural and blast pressure wave parameters on the importance of FSI is studied using an analysis of variables. Two non-dimensional parameters corresponding to the ratios of blast duration to the-time period of the structure and the velocity of the structure to the particle velocity of the incident blast pressure wave are identified. It is shown that for a given blast pressure wave, the error in the maximum displacement predicted by ignoring FSI effect during structural motion is directly proportional to the ratio of the structure velocity to the particle velocity of the incident blast pressure Wave. There is a continuous exchange of energy between the structure and air during the structural motion, which is significant when the structural velocity is significant compared to the particle velocity of incident blast pressure wave. FSI effect become insignificant when the ratio of velocities starts approaching zero. (c) 2009 Elsevier Ltd. All rights reserved.

关键词： Blast ALE Transient Dynamic fluid-structure interaction

来源：评论

学校读者我要写书评

暂无评论

Investigation into the fluid-structure interaction of a hydraulically damped rubber mount on the basis of finite element analysis

引用

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING 2009年第D3期223卷 327-342页

作者： Wang, L-R Wang, J-C Lu, Z-H Hagiwara, I. Tokyo Inst Technol Dept Mech Sci & Engn Meguro Ku Tokyo 1528552 Japan Beijing Inst Technol Sch Mech & Vehicular Engn Beijing 100081 Peoples R China Tsinghua Univ Dept Automot Engn Beijing 100084 Peoples R China Tsinghua Univ State Key Lab Automot Safety & Energy Beijing 100084 Peoples R China

This paper investigates the working process simulation of a hydraulically damped rubber mount (HDM) based on finite element (FE) analysis of the fluid-structure interaction (FSI). The direct computing method of coupled FSI formulation in arbitrary Lagrangian-Eulerian coordinates and the mixed displacement-pressure FE formulation for the incompressible medium, rubber, are adopted. The constitutive law of rubber is determined by FE analysis of incompressible material. A proportion mesh control algorithm helps to overcome fluid mesh distortion. Comparison of the predicted and experimental static elasticities verifies the effectiveness of the presented modelling approach of an HDM. Analysis of fluid pressure-velocity fields and deformation-stress fields of rubber components under typical working conditions clarifies the working process of the HDM, which can help to evaluate the carrying capacity, to identify the chamber volumetric characteristics, and to determine the fluid field distribution and stress distribution of rubber parts for the structural design of the HDM.

关键词： hydraulically damped rubber mount engine mount fluid-structure interaction finite element static elastic characteristic dynamic characteristic rubber hyperelasticity

来源：评论

学校读者我要写书评

暂无评论

Strongly coupled fluid-structure interaction method for structural loads on surface ships

引用

OCEAN ENGINEERING 2009年第17-18期36卷 1346-1357页

作者： Paik, Kwang-Jun Carrica, Pablo M. Lee, Donghee Maki, Kevin Univ Iowa IIHR Hydrosci & Engn Iowa City IA 52242 USA Univ Michigan Dept Naval Architecture & Marine Engn Ann Arbor MI 48109 USA

A method to Compute structural loads on surface ships coupling a CFD solver with rigid or elastic representations of the ship hull is presented. One-way and two-way coupling approaches were used for the cases when the ship was considered elastic, in which the forces obtained from the CFD solver were used to compute the structural loads. In the two-way coupling method the hull deformation influenced the CFD solution, while in the one-way coupling method this feedback was not needed. The flow field around the ship was calculated with the URANS/DES overset solver CFDShip-Iowa version 4, with the structural response obtained using modal superposition. Predictions of ship motions and structural loads were compared with available experimental data for the S175 containership, obtained from a segmented elastic model. Predicted heave and pitch transfer functions in regular waves matched well with the experimental values. The computations showed that slamming events greatly affected the vertical bending moment amplitude, showing sharp peaks for the rigid model. The elastic models predicted well the ringing of the structure and showed that the ringing was mainly triggered by bow flare slamming. The one-way coupled approach with a virtual mass correction provided a solution that in some aspects had almost the same quality as the two-way coupled solution, at a fraction of the cost. (C) 2009 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Structural loads CFD Ship hydrodynamics Modal superposition

来源：评论

学校读者我要写书评

暂无评论

Patient-specific isogeometric fluid-structure interaction analysis of thoracic aortic blood flow due to implantation of the Jarvik 2000 left ventricular assist device

引用

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2009年第45-46期198卷 3534-3550页

作者： Bazilevs, Y. Gohean, J. R. Hughes, T. J. R. Moser, R. D. Zhang, Y. Univ Calif San Diego Dept Struct Engn La Jolla CA 92093 USA Univ Texas Austin Inst Computat Engn & Sci Austin TX 78712 USA Carnegie Mellon Univ Pittsburgh PA 15213 USA

Left ventricular assist devices (LVADs) are continuous flow pumps that are employed in patients with severe heart failure. Although their emergence has significantly improved therapeutic options for patients with heart failure, detailed studies of the impact of LVADs on hemodynamics are notably lacking. To this end we initiate a computational study of the Jarvik 2000 LVAD model employing isogeometric fluid-structure interaction analysis. We focus on a patient-specific configuration in which the LVAD is implanted in the descending thoracic aorta. We perform computations for three pump settings and report our observations for several quantities of hemodynamic interest. It should be noted that this paper presents the first three-dimensional, patient-specific fluid-structure interaction simulation of LVADs. (C) 2009 Elsevier B.V. All rights reserved.

关键词： Arbitrary Lagrangian-Eulerian (ALE) formulation Blood flow Cardiovascular modeling fluid-structure interaction Hyperelastic solids Incompressible fluids Isogeometric analysis Left ventricular assist devices Mesh movement Moving domains NURBS Oscillatory shear index Wall shear stress

来源：评论

学校读者我要写书评

暂无评论

A kinematically coupled time-splitting scheme for fluid-structure interaction in blood flow

引用

APPLIED MATHEMATICS LETTERS 2009年第5期22卷 684-688页

作者： Guidoboni, Giovanna Glowinski, Roland Cavallini, Nicola Canic, Suncica Lapin, Sergey Univ Houston Dept Math Houston TX 77204 USA Univ Paris 06 Lab Jacques Louis Lions F-75005 Paris France Washington State Univ Dept Math Pullman WA 99164 USA Univ Ferrara Ctr Math Technol I-44100 Ferrara Italy

We present a new time-splitting scheme for the numerical simulation of fluid-structure interaction between blood flow and vascular walls. This scheme deals in a successful way with the problem of the added mass effect. The scheme is modular and it embodies the stability properties of implicit schemes at the low computational cost of loosely coupled ones. Published by Elsevier Ltd

关键词： fluid-structure interaction Added mass effect Operator splitting Finite elements

来源：评论

学校读者我要写书评

暂无评论

Stabilization of explicit coupling in fluid-structure interaction involving fluid incompressibility

引用

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2009年第5-8期198卷 766-784页

作者： Burman, Erik Fernandez, Miguel A. INRIA F-78153 Le Chesnay France Univ Sussex Dept Math Brighton BN1 9RF E Sussex England

In this work, we propose a stabilized explicit coupling scheme for fluid-structure interaction problems involving a viscous incompressible fluid. The coupled discrete formulation is based on Nitsche's method with a time penalty term giving L-2-control on the fluid pressure variations at the interface. For a linear model problem, we prove that the scheme is stable, in the energy norm, irrespectively of the so-called added-mass effect, namely, the fluid-structure density ratio and the geometry of the domain. Numerical experiments, in the linear and non-linear case, show that optimal time accuracy can be obtained by performing one defect-correction iteration. (C) 2008 Elsevier B.V. All rights reserved.

关键词： fluid-structure interaction Nitsche's method fluid incompressibility Added-mass effect Time discretization Explicit coupling Loosely coupled schemes Defect-correction method

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：