Effect of freestream turbulence on turbulent properties of a separationreattachment flow
Abstract
A study of the effect of freestream turbulence on the turbulent structure of a separation bubble formed at the leading edge of a blunt plate with rightangled corners is presented. The freestream turbulence was introduced by a thin circular rod placed upstream of the plate along its stagnation streamline. This paper is a sequel to previous papers by Kiya and Sasaki (1983) and Kiya et al. (1984), in which timeaveraged properties of the separation bubble are determined in terms of the turbulence intensity at a reference point near an edge of the plate. The longitudinal and spanwise integral length scales of vortices in the separation bubble are given as functions of the freestream turbulence intensity. The cross correlations between the surfacepressure and velocity fluctuations suggested that largescale vortices are similar in shape independently of the freestream turbulence intensity. Moreover, the maximum rms surface pressure was estimated in terms of the longitudinal gradient of the timemean surfacepressure profile and the longitudinal length scale of vortices in the reattaching zone.
 Publication:

JSME International Journal Series B
 Pub Date:
 April 1985
 Bibcode:
 1985JSMEB..28..610S
 Keywords:

 Blunt Leading Edges;
 Flow Stability;
 Free Flow;
 Reattached Flow;
 Separated Flow;
 Turbulent Flow;
 Cross Correlation;
 Flow Measurement;
 Pressure Distribution;
 Turbulent Wakes;
 Fluid Mechanics and Heat Transfer