A computational study on the possibility of the initialization and development of intracranial aneurysms considering biofluid and biosolid mechanics

Yixiang Feng, Shigeo Wada, Takami Yamaguchi

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Intracranial aneurysms are local dilations of the arterial wall which have a very high morbidity rate if they rupture. Although the mechanism initiation, growth, and rupture of intracranial aneurysms are still unknown yet, it is believed to be closely related to both biosolid and biofluid mechanics. Therefore, a multi-physical model is needed to study the pathophysiology of intracranial aneurysms. In this study, we introduce a numerical model on the development of intracranial aneurysms considering the interaction between fluid and structure interaction. The blood flow is considered to be incompressible, Newtonian, and laminar. The vessel wall is considered to be elastic and isotropic. The coupling between the structural and fluid domain is performed using a two-way weak coupling method. Three general shapes are adopted in this study, namely a straight vessel, a curved vessel, and a vessel with bifurcations. They represent vessel geometries that are most typical to the cerebral vasculature. The numerical model is a "rule-base" one in a sense that different kinds of rules can be tested. In our study, we adopt the high wall shear stress hypothesis as a cause for aneurysm initiation and development. A threshold value is used for the wall shear stress. It is shown that aneurysm initiation and development can be realized using our numerical model. And the influence of WSS threshold, the Reynolds number and some other parameters are also discussed.

Original languageEnglish
Title of host publicationSingle and Two-Phase Flows on Chemical and Biomedical Engineering
PublisherBentham Science Publishers Ltd.
Pages613-633
Number of pages21
ISBN (Print)9781608053476
DOIs
Publication statusPublished - 2012

Keywords

  • Aneurysm initiation and development
  • Arterial wall
  • Biosolid and biofluid mechanics
  • Blood flow
  • Cerebral vasculature
  • Curved vessel
  • Fluid and structure interaction
  • Intracranial aneurysms
  • Numerical model
  • Straight vessel
  • Vessel with bifurcations
  • Wall shear stress

ASJC Scopus subject areas

  • Engineering(all)

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