Fluid-Structure Interaction Effects on Sac-Blood Pressure and Wall Stress in a Stented Aneurysm

2005 ◽  
Vol 127 (4) ◽  
pp. 662 ◽  
Author(s):  
Z. Li ◽  
C. Kleinstreuer
Keyword(s):  
Blood Pressure ◽  
Fluid Structure Interaction ◽  
Wall Stress ◽  
Interaction Effects ◽  
Fluid Structure ◽  
Structure Interaction

An Approach on Fluid-Structure Interaction for the Prediction of Blood Flow in Aneurysms With Various Shapes

2013 ◽  
Author(s):  
Sang Hyuk Lee ◽  
Nahmkeon Hur ◽  
Seongwon Kang
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Vascular Disease ◽  
Wall Motion ◽  
Fluid Structure Interaction ◽  
Rapid Evolution ◽  
Saccular Aneurysm ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Arterial Hemodynamics

Recently, the rapid evolution of numerical methodologies for CFD and structural analyses has made it possible to predict the arterial hemodynamics closely related to vascular disease. In the present study, a framework for fluid-structure interaction (FSI) analysis was developed to accurately predict the arterial hemodynamics. The numerical results from the FSI analysis of the hemodynamics inside aneurysms of various shapes were compared to the results without FSI analysis. The results showed that FSI analysis needs to be performed in order to accurately predict the blood flow affected by the wall motion of compliant arteries. FSI analysis is essential to predict the hemodynamics in a saccular aneurysm because the arterial wall’s movement, which is a result of the variation of blood pressure in the aneurysmal sac, mainly produces the blood flow to a saccular aneurysm.

The Dynamic Response of Gravity Type Quay Wall During Earthquake Including Soil-Sea-Structure Interaction

2006 ◽  
Author(s):  
A. R. M. Gharabaghi ◽  
A. Arablouei ◽  
A. Ghalandarzadeh ◽  
K. Abedi
Keyword(s):  
Dynamic Response ◽  
Direct Method ◽  
Fluid Velocity ◽  
Fluid Structure Interaction ◽  
Interaction Effects ◽  
Material Behavior ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Media Formulation ◽  
Quay Wall

The dynamic response of gravity type quay wall during earthquake including soil-sea-structure interaction is calculated using ADINA finite element techniques. The main objective of this study is to investigate the effects of fluid-structure interaction on the residual displacement of wall after a real earthquake. A direct symmetric coupled formulation based on the fluid velocity potential is used to calculate the nonlinear hydrodynamic pressure of sea water acting on the wall. The doubly asymptotic approximation (DAA) is used to account for the effects of outer fluid on the inner region. The non-associated Mohr-Coulomb material behavior is applied to model the failure of soil. The full nonlinear effective stress analysis is performed in this study and the soil-pore fluid interaction effects are modeled using porous media formulation. Viscous boundary condition is implemented to model the artificial boundary in direct method analysis of soil-structure interaction system and sliding contact condition was modeled in the interface of wall and surrounding soil. A typical configuration of gravity quay wall is used for analysis and three real earthquakes excitation are applied as base acceleration. The results show that influence of fluid-structure interaction effects on the permanent displacement of a gravity quay wall constructed on relatively non-liquefiable site is not considerable.

APPLICATION OF FLUID-STRUCTURE INTERACTION TO NUMERICAL SIMULATIONS IN THE LEFT VENTRICLE

2015 ◽  
Vol 39 (4) ◽  
pp. 749-766
Author(s):  
Matthew G. Doyle ◽  
Stavros Tavoularis ◽  
Yves Bougault
Keyword(s):  
Left Ventricle ◽  
Numerical Simulations ◽  
Cardiac Cycle ◽  
Fluid Structure Interaction ◽  
Wall Stress ◽  
Temporal Variations ◽  
Cavity Pressure ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Early Filling

Numerical simulations of blood flow and myocardium motion for an average canine left ventricle (LV) with fluid-structure interaction were performed. The temporal variations of the LV cavity pressure and wall stress during the cardiac cycle were consistent with previous literature. LV cavity volume was conserved from one period to the next, despite sub-physiological ejection volumes and brief periods of backflow during early filling. This study improves on previous ones by presenting details of the models and results for both the fluid and solid components of the LV.

Fluid-Structure Interaction Effects Modeling for the Modal Analysis of a Nuclear Pressure Vessel

2006 ◽  
Vol 129 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Jean-François Sigrist ◽  
Daniel Broc ◽  
Christian Lainé
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Pressure Vessel ◽  
Nuclear Reactor ◽  
Fluid Structure Interaction ◽  
Added Mass ◽  
Interaction Effects ◽  
Element Discretization ◽  
Fluid Structure ◽  
Structure Interaction

The present paper deals with the modal analysis of a nuclear reactor with fluid-structure interaction effects. The proposed study aims at describing various fluid-structure interaction effects using several numerical approaches. The modeling lies on a classical finite element discretization of the coupled fluid-structure equation, enabling the description of added mass and added stiffness effects. A specific procedure is developed in order to model the presence of internal structures within the nuclear reactor, based on periodical homogenization techniques. The numerical model of the nuclear pressure vessel is developed in a finite element code in which the homogenization method is implemented. The proposed methodology enables a convenient analysis from the engineering point of view and gives an example of the fluid-structure interaction effects, which are expected on an industrial structure. The modal analysis of the nuclear pressure vessel is then performed and highlights of the relative importance of FSI effects for the industrial case are evaluated: the analysis shows that added mass effects and confinement effects are of paramount importance in comparison to added stiffness effects.

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