Dimensional Analysis and Dissipation Rate Estimation in the Near Wake of a Circular Cylinder
Dimensional Analysis and Dissipation Rate Estimation in the Near Wake of a Circular Cylinder作者机构：Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei Anhui 230027 China
出 版 物：《Journal of Applied Mathematics and Physics》 (应用数学与应用物理（英文）)
年 卷 期：2014年第2卷第6期
页 面：431-436页
学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）]
主 题：Cylinder Near Wake Large Eddy PIV Dissipation Rate
摘 要：A particle image velocimetry (PIV) experiment is performed for dissipation rate estimation in the near wake behind a circular cylinder with diameter D of 12 mm and corresponding Reynolds number of 7100. Considering the limitation of PIV resolution, a large eddy PIV method based on idea of large eddy simulation (LES), is used for more accurate estimation of dissipation rate. Based on the dynamic equilibrium assumption in the inertial subrange, the dissipation rate of the subgrid scales is approximated by the subgrid scale (SGS) flux, computed from PIV velocity fields and Smagorinsky model for SGS stress. A dimensional analysis about the integral length scale and the Kolmogorov length scale is discussed firstly to verify whether the dynamic equilibrium assumption holds or not.
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