Lieber B B, Giddens D P, Kitney R I, Talhami H
Department of Mechanical and Aerospace Engineering, State University of New York, Buffalo 14260.
J Biomech Eng. 1989 Feb;111(1):42-6. doi: 10.1115/1.3168338.
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.
研究了一种结合匹配滤波器的频域方法，用于区分具有带限频率成分的有序速度波动和脉动紊流中的随机速度变化。伪离散频率处的波动可能对根据非定常纳维 - 斯托克斯方程计算的表观应力张量有显著贡献，并且一旦速度变化被分解，就可以获得由这些有序结构产生的应力估计值。这种分解类型允许在诸如患病狭窄动脉或人工心脏瓣膜下游等血流应用中估计湍流中由相干部分和随机部分组成的表观应力。
