Experimental Characterization of Smooth Body Flow Separation Over Wall-Mounted Gaussian Bump
Patrick D. Gray, Igal Gluzman, Flint O. Thomas, Thomas Corke
Abstract
View Video Presentation: https://doi.org/10.2514/6.2022-1209.vid This study was motivated by the need for a benchmark data set for the characterization of smooth body separation over a wall-mounted, Gaussian surface. Skin friction values were computed using a modified oil film interferometry technique that implements a flexible calibration board to correct for perspective and geometric distortions. Experiments were conducted at the University of Notre Dame to show how this method can be used to acquire skin friction values for models with surface curvature. Two test cases conducted at Re_L = 2×10^6 and 4 × 106 were investigated. Image data was processed to determine the centerspan streamwise development of the wall shear stress. The results were compared to a spanwise-periodic direct numerical computation at Re_L = 2 × 10^6 to show the method’s effectiveness.