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Jiang Nan, Guan Xinlei, Yu Peining. TOMOGRAPHIC TRPIV MEASUREMENT OF ANISOTROPIC EDDY-VISCOSITY MODEL FOR COHERENT STRUCTURE REYNOLDS STRESS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2012, 44(2): 213-221. DOI: 10.6052/0459-1879-2012-2-20120203
Citation: Jiang Nan, Guan Xinlei, Yu Peining. TOMOGRAPHIC TRPIV MEASUREMENT OF ANISOTROPIC EDDY-VISCOSITY MODEL FOR COHERENT STRUCTURE REYNOLDS STRESS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2012, 44(2): 213-221. DOI: 10.6052/0459-1879-2012-2-20120203

TOMOGRAPHIC TRPIV MEASUREMENT OF ANISOTROPIC EDDY-VISCOSITY MODEL FOR COHERENT STRUCTURE REYNOLDS STRESS

Funds: The project was supported by the National Natural Science Foundation of China (10832001, 10872145), Opening Subject of State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences and Tianjin University,Research and Innovation Foundation.
  • Received Date: July 25, 2011
  • Revised Date: September 14, 2011
  • The time sequences dataset of 3D-3C flow field of turbulent boundary layer in a water tunnel by tomographic TRPIV were employed to put forward the new concept of spatial locally-averaged velocity structure function of turbulence that describes the spacial dilation, compression, shear deformation and rotation of the multi-scale turbulent eddy structure. According to the physical characteristics of the multi-scale vortex structures' stretch and compression in turbulent flow, a new conditional sampling method of coherent structure, based on the concept of multi-scale spatial locally averaged velocity structure function along the longitudinal direction, was proposed to extract the spatial topology of physical quantities such as fluctuating velocity, mean velocity strain rate and Reynolds stress during the process of coherent structure burst in TRPIV dataset. In this paper, the relationship between mean velocity strain rate and Reynolds stress was studied. The validity of the anisotropic eddy viscosity model was confirmed for coherent structure Reynolds stress in wall-bounded turbulence through investigating the spatial phase difference between Reynolds stress components and mean velocity strain rate components.
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