Team for Advanced Flow Simulation and Modeling |
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Fluid-Structure Interaction Modeling of Aneurysmal Conditions with High Blood PressureThe Deforming-Spatial-Domain/Stabilized Space-Time (DSD/SST) formulation was introduced in [1-3] for flow problems with moving boundaries and interfaces and has been applied to a large class of problems, including FSI. In this joint work with Ryo Torii and Marie Oshima (University of Tokyo), the version of the DSD/SST formulation introduced in [4] is applied to computation of the FSI and wall shear stress for aneurysmal conditions with high blood pressure. This joint work is described fully in [5]. The computations were carried out by Ryo Torii, using a computer program he wrote with guidance and help from the T*AFSM. The computer model was extracted from the computed tomography (CT) model of the middle cerebral artery bifurcation of a 59 year-old female patient. In the FSI computation, the arterial walls are assumed to be made of a linearly elastic material, but the geometric nonlinearities are accounted for. A computation was carried out also with a model with normal blood pressure, so that we can see the influence of hypertension. The computations show that hypertension makes a significant difference in the predicted values of not only the mechanical stress in the aneurysmal wall but also the wall shear stress.
References
1. T.E. Tezduyar, "Stabilized Finite Element Formulations for Incompressible Flow Computations", Advances in Applied Mechanics, 28 (1992) 1-44. |