Dimensional Analysis and Dissipation Rate Estimation in the Near Wake of a Circular Cylinder

Autor:	Jiangzhi Yang, Minghou Liu, Wei Wei Zhong, Xintai Zhang
Rok vydání:	2014
Předmět:	Physics Length scale Scale (ratio) Reynolds number Mechanics Wake Dissipation Physics::Fluid Dynamics symbols.namesake Classical mechanics Particle image velocimetry symbols Cylinder Large eddy simulation
Zdroj:	Journal of Applied Mathematics and Physics. :431-436
ISSN:	2327-4379 2327-4352
DOI:	10.4236/jamp.2014.26052
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::818d8845b72ccfe723d4901228a1074c https://doi.org/10.4236/jamp.2014.26052 Zobrazit plný text záznamu