Fluid-structure interaction modeling of a patient-specific cerebral aneurysm: Influence of structural modeling

Ryo Torii, Marie Oshima, Toshio Kobayashi, Kiyoshi Takagi, Tayfun E. Tezduyar

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

Fluid-structure interaction (FSI) simulations of a cerebral aneurysm with the linearly elastic and hyper-elastic wall constitutive models are carried out to investigate the influence of the wall-structure model on patient-specific FSI simulations. The maximum displacement computed with the hyper-elastic model is 36% smaller compared to the linearly elastic material model, but the displacement patterns such as the site of local maxima are not sensitive to the wall models. The blood near the apex of an aneurysm is likely to be stagnant, which causes very low wall shear stress and is a factor in rupture by degrading the aneurysmal wall. In this study, however, relatively high flow velocities due to the interaction between the blood flow and aneurysmal wall are seen to be independent of the wall model. The present results indicate that both linearly elastic and hyper-elastic models can be useful to investigate aneurysm FSI.

Original languageEnglish
Pages (from-to)151-159
Number of pages9
JournalComputational Mechanics
Volume43
Issue number1
DOIs
Publication statusPublished - 2008 Dec
Externally publishedYes

Keywords

  • Cerebral aneurysm
  • Fluid-structure interaction
  • Patient-specific modeling
  • Structural model

ASJC Scopus subject areas

  • Computational Mechanics
  • Ocean Engineering
  • Mechanical Engineering
  • Computational Theory and Mathematics
  • Computational Mathematics
  • Applied Mathematics

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