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ISSN オンライン: 2642-0554

SHEAR-INSTABILITY IN POSTSTENOTIC ARTERIAL FLOWS

Francois Mallinger
Queen Mary, University of London Engineering Department, London El 4NS, UK

Dimitris Drikakis
Queen Mary, University of London Engineering Department, London El 4NS, UK

要約

The paper is concerned with instabilities and transition-to-turbulence in pulsatile flows through a stenosis. Our long term objective is to obtain a better understanding of the flow phenomena associated with diseases such as atherosclerosis and stroke. This can potentially help the development of better diagnostic criteria and clinical detection techniques. Using high-order Godunov-type methods and advanced non-linear multigrid algorithms we have performed three-dimensional simulations of the pulsatile flow through a 75% stenosis and investigate the details of the flow development with particular interest in the poststenotic region. Our simulations reveal the formation of a three-dimensional instability which leads to a strongly disturbed flow extended up to 50-60 radius downstream of the stenosis. This flow behaviour subsequently affects the wall shear stress distribution.