scholarly journals Numerical modeling of fluid-structure interaction in arteries with anisotropic polyconvex hyperelastic and anisotropic viscoelastic material models at finite strains

2015 ◽  
Vol 32 (10) ◽  
pp. e02756 ◽  
Author(s):  
Daniel Balzani ◽  
Simone Deparis ◽  
Simon Fausten ◽  
Davide Forti ◽  
Alexander Heinlein ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Viscoelastic Material ◽  
Fluid Structure Interaction ◽  
Finite Strains ◽  
Material Models ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Anisotropic Viscoelastic Material

scholarly journals Numerical modeling in arterial hemodynamics incorporating fluid-structure interaction and microcirculation

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Fan He ◽  
Lu Hua ◽  
Tingting Guo
Keyword(s):  
Numerical Modeling ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Fluid Structure Interaction ◽  
Rigid Wall ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Arterial Hemodynamics ◽  
Wall Compliance ◽  
Wall Shear

Abstract Background The effects of arterial wall compliance on blood flow have been revealed using fluid-structure interaction in last decades. However, microcirculation is not considered in previous researches. In fact, microcirculation plays a key role in regulating blood flow. Therefore, it is very necessary to involve microcirculation in arterial hemodynamics. Objective The main purpose of the present study is to investigate how wall compliance affects the flow characteristics and to establish the comparisons of these flow variables with rigid wall when microcirculation is considered. Methods We present numerical modeling in arterial hemodynamics incorporating fluid-structure interaction and microcirculation. A novel outlet boundary condition is employed to prescribe microcirculation in an idealised model. Results The novel finding in this work is that wall compliance under the consideration of microcirculation leads to the increase of wall shear stress in contrast to rigid wall, contrary to the traditional result that wall compliance makes wall shear stress decrease when a constant or time dependent pressure is specified at an outlet. Conclusions This work provides the valuable study of hemodynamics under physiological and realistic boundary conditions and proves that wall compliance may have a positive impact on wall shear stress based on this model. This methodology in this paper could be used in real model simulations.

A Fluid Structure Interaction Approach for Patient Based Abdominal Aortic Aneurysm Rupture Risk Prediction

2010 ◽  
Author(s):  
Michalis Xenos ◽  
Suraj Rambhia ◽  
Yared Alemu ◽  
Shmuel Einav ◽  
John J. Ricotta ◽  
...  
Keyword(s):  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Fluid Structure Interaction ◽  
Patient Specific ◽  
Rupture Risk ◽  
Material Models ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Abdominal Aortic ◽  
Risk Of Rupture

Fluid structure interaction (FSI) simulations of patient-specific fusiform non-ruptured and contained ruptured Abdominal Aortic Aneurysm (AAA) geometries were conducted. The goals were: (1) to test the ability of our FSI methodology to predict the location of rupture, by correlating the high wall stress regions with the rupture location, (2) estimate the state of the pathological condition by calculating the ruptured potential index (RPI) of the AAA and (3) predict the disease progression by comparing healthy and pathological aortas. The patient specific AAA FSI simulations were carried out with advanced constitutive material models of the various components of AAA, including models that describe wall anisotropy based on collagen fibers orientation within the arterial wall, structural strength of the aorta, intraluminal thrombus (ILT), and embedded calcifications. The anisotropic material model used to describe the wall properties closely correlated with experimental results of AAA specimens. The results demonstrate that the anisotropic wall simulations showed higher peak wall stresses as compared to isotropic material models, indicating that the latter may underestimate the AAA risk of rupture. The ILT appeared to provide a cushioning effect reducing the stresses, while small calcifications (small-Ca) appeared to weaken the wall and contribute to the rupture risk. FSI simulations with ruptured AAA demonstrated that the location of the maximal wall stresses and RPI overlap the actual rupture region.

scholarly journals Numerical Modeling of Fluid-Structure Interaction with Free Surface Flows

PAMM ◽  
2003 ◽  
Vol 3 (1) ◽  
pp. 412-413 ◽  
Author(s):  
Andreas Kölke ◽  
Elmar Walhorn ◽  
Björn Hübner ◽  
Dieter Dinkler
Keyword(s):  
Numerical Modeling ◽  
Free Surface ◽  
Fluid Structure Interaction ◽  
Free Surface Flows ◽  
Surface Flows ◽  
Fluid Structure ◽  
Structure Interaction

Numerical modeling of a prototype cardiac assist device by implementing fluid-structure interaction

2018 ◽  
Vol 22 (C) ◽  
pp. 24 ◽  
Author(s):  
Shahrokh Rahmani ◽  
Mehrnaz Oveysi ◽  
Alireza Heidari ◽  
Mahdi Navidbakhsh ◽  
Mansour Alizadeh
Keyword(s):  
Numerical Modeling ◽  
Fluid Structure Interaction ◽  
Assist Device ◽  
Fluid Structure ◽  
Cardiac Assist ◽  
Structure Interaction ◽  
Cardiac Assist Device
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