期刊
MEDICAL ENGINEERING & PHYSICS
卷 29, 期 4, 页码 491-496出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.medengphy.2006.07.002
关键词
viscoelastic flow; blood flow; numerical simulation of flow
The influence of the non-Newtonian stress-strain relation of blood on the oscillatory shear index (OSI) and mean wall shear stress (WSS) are described. The unsteady linear ID momentum equation is solved for a viscoelastic fluid, with six elements of the Maxwell type and one dashpot element connected in parallel. A novel numerical algorithm is described which uses the upwind finite difference method to solve the equation of momentum. Results obtained by using a finite difference approach show significantly higher values of OSI when blood is assumed to be a viscoelastic fluid compared with those of simplified Newtonian fluid model. The calculation of OSI in human normal conditions for the Newtonian fluid differs in 12% (if alpha = 0.02) from the results obtained from using the viscoelastic model. (c) 2006 IPEM. Published by Elsevier Ltd. All rights reserved.
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