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Fluid-structure interaction modeling of a patient-specific cerebral aneurysm: influence of structural modeling. (English) Zbl 1169.74032

Summary: Fluid-structure interaction (FSI) simulations of a cerebral aneurysm with the linearly elastic and hyperelastic 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 hyperelastic 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 hyperelastic models can be useful to investigate aneurysm FSI.

MSC:

74L15 Biomechanical solid mechanics
74F10 Fluid-solid interactions (including aero- and hydro-elasticity, porosity, etc.)
74B05 Classical linear elasticity
74B20 Nonlinear elasticity
92C20 Neural biology
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