通过分岔的三维脉动流

C. Yung, K. Dewitt, S. Subramanian, A. Afjeh, T. Keith
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引用次数: 5

摘要

通过求解三维Navier-Stokes方程,对不可压缩牛顿流体在对称分岔刚性通道中的脉动流动进行了数值分析。分枝对称,分枝角60/spl°/,子母面积比2.0。预测的速度模式与文献中可用的实验测量结果在定性上一致。研究了非定常对各种流动特性的影响。观察到的最剧烈的影响是在流动反转区。在脉冲周期内,进口雷诺数最高时没有出现流动逆转,而在相同雷诺数的定常流动情况下,流动逆转区域最大。在脉冲周期的任何时候都观察到二次流的存在。沿外壁和内壁计算剪切应力,低和高时间平均剪切应力区域对应于临床观察到的动脉粥样硬化斑块和病变形成部位。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Three-dimensional pulsatile flow through a bifurcation
Pulsatile flow of an incompressible, Newtonian fluid through a symmetric bifurcated rigid channel was numerically analyzed by solving the three-dimensional Navier-Stokes equations. The bifurcation was symmetrical with a branch angle of 60/spl deg/ and a daughter to mother area ratio of 2.0. The predicted velocity patterns were in qualitative agreement with experimental measurements available in the literature. The effect of unsteadiness on the various flow characteristics was studied. The most drastic effect observed was on the flow reversal regions. There was no flow reversal at the highest inlet Reynolds number in the pulse cycle, whereas in the case of steady flow at the same Reynolds number, the flow reversal region was the largest. The presence of secondary flow was observed at all times during the pulse cycle. Shear stress was calculated along the outer and inner walls and the low and high time averaged shear stress regions correspond to the clinically observed sites of formation of atherosclerotic plaque and lesions.
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