Determination of the Threshold Values for Conditional Sampling in Detecting the Coherent Structures of Wall Turbulence by Using Auto Correlation Method
Nan Jiang · Journal of Experimental Mechanics · 1999
The relation between the threshold value in conditional sampling scheme for detecting the coherent structures and the average burst period of the coherent structures in wall turbulence is examined experimentally. Based on the average burst period of coherent structures, which could be detected by the auto correlation function of longitudinal fluctuating velocity in wall turbulence, an auto correlation method for determining the threshold value in condition sampling scheme is presented.