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  4. Aspects of Arterial Wall Simulations: Nonlinear Anisotropic Material Models and Fluid Structure Interaction
 
conference paper

Aspects of Arterial Wall Simulations: Nonlinear Anisotropic Material Models and Fluid Structure Interaction

Balzani, Daniel
•
Deparis, Simone  
•
Fausten, Simon
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Oñate, Eugenio
•
Oliver, Xavier
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2014
11th World Congress on Computational Mechanics (WCCM XI); 5Th European Conference On Computational Mechanics; 6Th European Conference On Computational Fluid Dynamics
11th World Congress on Computational Mechanics (WCCM XI) / 5th European Conference on Computational Mechanics (ECCM) / 6th European Conference on Computational Fluid Dynamics (ECFD)

The simulation of the physiological loading situation of arteries with moderate atherosclerotic plaque may provide additional indicators for medical doctors to estimate if the plaque is likely to rupture and if surgical intervention is required. In particular the transmural stresses are important in this context. They depend strongly on the mechanical response and thus, a predictive material model capturing all characteristics of the material behavior is required. Here, polyconvex strain energy functions are considered for the hyperelastic behavior and a simplified viscoelastic model is proposed which does not take into account an isochoric strain energy for the fiber response. Based thereon, a comparative study is presented, investigating the influence of viscoelasticity on the mechanical behavior of a simplified arterial wall and a rather small impact is found. Realistic predictions of transmural stress distributions require a simulation of the interaction between the blood flow and the vessel wall. We recall the equations that model fluid-structure interaction and the monolithic Convective Explicit algorithm for their numerical approximation, addressing both the cases when the fluid-structure meshes are conforming and nonconforming at the interface. We also present numerical experiments, using the monolithic approach, for the fluid structure interaction problem in a curved tube using a hyperelastic material model for the structure and an absorbing boundary condition. The fluid structure interaction using a highly nonlinear anisotropic structural model for the solid in this context is one of the main contributions of this paper.

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Type
conference paper
Web of Science ID

WOS:000353626501019

Author(s)
Balzani, Daniel
•
Deparis, Simone  
•
Fausten, Simon
•
Forti, Davide  
•
Heinlein, Alexander
•
Klawonn, Axel
•
Quarteroni, Alfio  
•
Rheinbach, Oliver
•
Schröder, Jörg
Editors
Oñate, Eugenio
•
Oliver, Xavier
•
Huerta, Antonio
Date Issued

2014

Publisher

International Center for Numerical Methods in Engineeering (CIMNE)

Publisher place

Barcelona

Published in
11th World Congress on Computational Mechanics (WCCM XI); 5Th European Conference On Computational Mechanics; 6Th European Conference On Computational Fluid Dynamics
ISBN of the book

978-84-942844-7-2

Volume

Ii - Iv

Start page

947

End page

958

Subjects

Arterial Walls

•

Finite Element Method

•

Nonlinear Solid

•

Fluid Structure Interaction

•

Parallel Simulation

•

Domain Decomposition

Editorial or Peer reviewed

NON-REVIEWED

Written at

EPFL

EPFL units
CMCS  
SCI-SB-SD  
Event nameEvent placeEvent date
11th World Congress on Computational Mechanics (WCCM XI) / 5th European Conference on Computational Mechanics (ECCM) / 6th European Conference on Computational Fluid Dynamics (ECFD)

Barcelona, Spain

July 20-25, 2014

Available on Infoscience
April 29, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/113586
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