Abstract
In this study, an optical-flow algorithm was applied to analyzing unsteady behavior of nearwake flow. The experiment was conducted at low-speed conditions and at Reynolds number around ReD = 1.97×104 to obtain image database for optical-flow processing. Measurement frequency was at 2000 fps. Results of the optical-flow algorithm were compared to previous studies by a traditional cross-correlation method. The ability of optical flow method to extract flow fields was, thereby, confirmed for blunt-base flow at low-speed conditions. Differing from previous studies and cross-correlation results, opticalflow results showed a dominated Strouhal number at around StD = 0.015, which is connected to vortex shedding behavior of the wake-flow. Additionally, the antisymmetric flow shows the most important behavior at low-speed conditions.
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