On the Discrimination Between Band-Limited Coherent and Random Apparent Stresses in Transitional Pulsatile Flow

[+] Author and Article Information
B. B. Lieber

Department of Mechanical and Aerospace Engineering, State University of New York at Buffalo, Buffalo, N.Y. 14260

D. P. Giddens

George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Ga. 30332-0405

R. I. Kitney, H. Talhami

Electrical Engineering, Imperial College, Exhibition Road, London SW7 2BT, England

J Biomech Eng 111(1), 42-46 (Feb 01, 1989) (5 pages) doi:10.1115/1.3168338 History: Received March 17, 1987; Revised December 10, 1988; Online June 12, 2009


A frequency domain approach that incorporates a matched filter was examined for discriminating between ordered velocity fluctuations with band-limited frequency content and random velocity variations in pulsatile disturbed flows. Fluctuations at pseudo-discrete frequencies may yield a significant contribution to the apparent stress tensor computed from the unsteady Navier Stokes equations, and an estimate of the stresses arising from these ordered structures can be obtained once the velocity variations have been decomposed. This type of decomposition permits the estimation of the apparent stresses in turbulent flows, consisting of coherent and random parts, in blood flow applications such as diseased constricted arteries or downstream of artificial heart valves.

Copyright © 1989 by ASME
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