Abstract
The objective of the present paper is to investigate the periodic flow behavior of the separation and reattachment process over a backward facing step in low Reynolds number range. The flow near a reattachment point on a step side wall was measured by Micro Flow Sensor. The characteristic frequency of the flow fluctuation near the wall was estimated to be about 36 Hz from FFT (fast Fourier transform) and Wavelet analyses, and the vortex structure around the spanwise axis was visualized with a high-speed video camera. Near wall flow shows the periodic vortices with one or two dominant frequencies as Reynolds number increases. The change of the vortex structure influences the periodic flow behavior downstream of the reattachment point.
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