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PIV Measurement of Spatial Relaxation Effect between Reynolds Stress and Mean Velocity Strain for Cylinder Wake Flow

Author: HuoXing
Tutor: JiangZuo
School: Tianjin University
Course: Fluid Mechanics
Keywords: Cylindrical wake TRPIV Turbulence model Reynolds stress Complex eddy viscosity modeling
CLC: O351.3
Type: Master's thesis
Year: 2010
Downloads: 45
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Abstract


In this paper, the cylindrical wake along the Karman vortex flow to the existence of periodic vortex structure , the use of two-dimensional high temporal resolution particle image velocimetry TRPIV technology , Reynolds stress and mean velocity deformation rate of the cylinder wake flow in a recirculating flume space relaxation effects of experimental measurements , the experimental study of cylindrical wake turbulence model complex eddy viscosity . Obtained in the sink in the sink into the different diameters of the cylindrical model , a different Reynolds number of the cylinder wake . Cylindrical wake TRPIV technique to measure the spatial distribution of the images of two - dimensional instantaneous velocity time series . 2D instantaneous velocity gradient and the speed of the deformation rate of the spatial distribution of space difference calculation . Then by time averaging, the average speed of the deformation rate spatial distribution image . Meanwhile , the time series of two - dimensional instantaneous velocity space distribution for the time average of the spatial distribution of the two-dimensional average speed , then the instantaneous velocity minus the average speed of image time series of the fluctuating velocity space distribution , fluctuating velocity component product space the distribution image time series of the average time to obtain each component of the two Wei Leinuo stress spatial distribution image . According to the theory of turbulent eddy viscosity model , deformation rate space distribution with the average speed between the space of distribution of Bi Leinuo stress space phase difference , confirmed the turbulent complex eddy viscosity model theory of rationality .

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CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics > Ordinary fluid mechanics > Incompressible ideal fluid dynamics
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