LES of additive and non-additive pulsatile flows in a model arterial stenosis

Molla, M.M., Paul, M. and Roditi, G. (2010) LES of additive and non-additive pulsatile flows in a model arterial stenosis. Computer Methods in Biomechanics and Biomedical Engineering, 13(1), pp. 105-120. (doi: 10.1080/10255840903062545)

Abstract

Transition of additive and non-additive pulsatile flows through a simple 3D model of arterial stenosis is investigated by using a large eddy simulation (LES) technique. We find in both the pulsatile cases that the interaction of the two shear layers, one of which separates from the nose of the stenosis and the another one from its opposite wall, causes recirculation in the flow downstream of the stenosis where the nature of the transient flow becomes turbulent. The strength of this recirculation is found to be quite high from the non-additive pulsations when the flow Reynolds numbers, Re ≥ 1500, for which both the pressure and shearing stresses take on an oscillating form at the post-stenotic region. Potential medical consequences of these results are discussed in the paper. In addition, some comparisons of the non-additive pulsatile results are given with those of both the additive pulsatile and steady flows. The capability of using LES to simulate the pulsatile transitional flow is also assessed, and the present results show that the smaller (subgrid) scales (SGS) contributes about 78% energy dissipation to the flow when the Reynolds number is taken as 2000. The level of SGS dissipation decreases as the Reynolds number is decreased. The numerical results are validated with the experimental data available in literature where a quite good agreement is found.

• Item Type: Articles
• Additional Information: This is an electronic version of an article published in <i>Computer Methods in Biomechanics and Biomedical Engineering</i> 13(1):105-120. <i>Computer Methods in Biomechanics and Biomedical Engineering</i> is available online at: www.tandfonline.com.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Paul, Professor Manosh and Roditi, Dr Giles
• Authors: Molla, M.M., Paul, M., and Roditi, G.
• College/School: College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing; College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Computer Methods in Biomechanics and Biomedical Engineering
• Publisher: Taylor & Francis
• ISSN: 1025-5842
• ISSN (Online): 1476-8259
• Copyright Holders: Copyright © 2010 Taylor and Francis
• First Published: First published in Computer Methods in Biomechanics and Biomedical Engineering 13(1):105-120
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher.