Abstract

The results of experimental studies and numerical simulation of the flow structure in the separation region downstream of an asymmetric narrowing of smooth canal that simulates 70% one-sided stenosis of the artery are presented. The Reynolds number was equal to 1800. The instantaneous flow velocity vector fields were measured using the SIV technique. The numerical solution was obtained by the large eddy simulation (LES) method. Setting the disturbances in numerical simulation close to the experimental conditions made it possible to obtain a satisfactory agreement between the calculated and experimental velocity fields and the components of the Reynolds stress tensor. The data on formation of the local flow turbulence region behind the constriction and subsequent downstream flow relaminarization are obtained. It is shown that a pair of secondary eddies localized within the region of flow separation is formed near the throat of the constriction.

中文翻译：

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模拟动脉狭窄的不对称狭窄下游的流动结构和向局部湍流的过渡

摘要

介绍了模拟 70% 单侧动脉狭窄的光滑管道不对称狭窄下游分离区流动结构的实验研究和数值模拟结果。雷诺数等于 1800。使用 SIV 技术测量瞬时流速矢量场。数值解是通过大涡模拟（LES）方法获得的。将数值模拟中的扰动设置为接近实验条件，可以使计算速度场和实验速度场与雷诺应力张量的分量之间取得令人满意的一致性。获得了收缩后的局部流动湍流区域形成和随后的下游流动再层流化的数据。