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NUMERICAL SIMULATION OF PULSATILE FLOW THROUGH STENOTIC VESSELS

Sonu S. Varghese
School of Mechanical Engineering, Purdue University West Lafayette, IN, USA 47907

Steven H. Frankel
School of Mechanical Engineering, Purdue University West Lafayette, IN, USA 47907

Robin Pitt
Department of Aeronautics, Imperial College London, SW7 2AZ, United Kingdom

Spencer J. Sherwin
Department of Aeronautics, Imperial College London, Prince Consort Rd, London, SW7 2BY, UK

Resumo

High-order simulations of pulsatile flow through a stenotic vessel were performed using the spectral/hp element method to study the post-stenotic flow field and the influence of fluid dynamic variables in the initiation of atherosclerosis. Asymmetric flow features were found to occur downstream of the stenosis, producing fluctuating regions of wall shear stress. Particle tracking was also employed to qualitatively study vorticity evolution. Mixing between core flow and near-wall structures was observed far downstream of the stenosis, away from the jet-like region which could promote cyclic transition to turbulence.
Steady flow simulations through elliptic and asymmetric stenosis models were also performed to assess the role of stenosis morphology on post-stenotic flow behavior. The geometry of the stenosis greatly affects the flow downstream, including the extent of mixing between the core and nearwall structures.