M. Li, J.J. Beech-Brandt, W.J. Easson, and P.R. Hoskins (UK)
Cardiovascular system, Hemodynamics, Numerical simulation, Fluid-structure interaction, Stenosis, Artery wall motion
In the cardiovascular system, blood flow is under constant interaction with vessel walls. There have been many studies which have simulated blood flow through rigid arteries. However, to predict blood flow more accurately, it is necessary to take account of the influence of vessel wall motion. This study coupled two commercial software packages, FLUENT and ABAQUS, together by an interface program. The coupled code is first validated against the Moens-Korteweg solution for pulse wave propagation through an elastic tube. It is then applied to compliant straight and stenosed tubes. The effects of wall elasticity are examined by the comparison between rigid tubes and elastic tubes. It shows that wall elasticity changed the wall shear stress (WSS) magnitude. The effects of stenosis on the wall motion pattern, WSS distribution and flow pattern with the presence of wall movement are also observed. The results showed that the stenosis heightened the WSS at the throat, constrained the wall movement, and changed the flow pattern considerably.
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