Study of Near Wall Coherent Flow Structures on Dimpled Surfaces Using Unsteady Pressure Measurements
Study of Near Wall Coherent Flow Structures on Dimpled Surfaces Using Unsteady Pressure Measurements
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DOI：
10.1007/s10494-012-9433-9
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
V. Voskoboinick;N. Kornev;J. Turnow
中科院分区：
文献类型：
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作者：
V. Voskoboinick;N. Kornev;J. Turnow
在 ReD= 40,000 的湍流狭窄通道内的球形凹坑内进行了非稳态压力测量，目的是研究相干涡流结构并深入了解流动物理学。结果证实了在两个极端位置之间切换的不对称相干涡旋结构的形成。压力时间分布和相关函数的分析表明凹坑内存在反相运动。再现了压力脉动能谱ω− 1和ω− 7/3的典型幂律。
Unsteady pressure measurements have been performed inside a spherical dimple in a narrow channel for turbulent flow atReD= 40,000 with the aim to study coherent vortex structures and to get a deep insight into flow physics. Results confirm the formation of asymmetric coherent vortex structures switching between two extreme positions. Analysis of the pressure temporal distributions and correlation functions shows the presence of the anti-phase motion inside the dimple. Typical power laws of the pressure fluctuation energy spectrumω− 1andω− 7/3are reproduced.