Quantitative aspects on the relationship of the incoming freestream turbulence and the stretched vortical structures developed in a two-dimensional stagnation region are reported in this work. The optimal time delay that resulted from the cross correlation of the velocity fluctuations measured in the stagnation region and the wall-pressure fluctuations is successfully normalized by the freestream velocity and the width of the bluff body, implying that this time delay is attributed to the effect of mean-flow convection. The statistics regarding the unsteady stretched vortical structures detected at a fixed location in the stagnation region, in terms of the number of events per unit time and the averaged time duration of the flow structures detected, are successfully scaled by Lx and wo, where Lx and wo are the integral length scale and the intensity of grid-generated turbulence, respectively.
All Science Journal Classification (ASJC) codes
- Aerospace Engineering