This paper studies the variations in flow characteristics over a Double Forward-Facing Step (DFFS) by considering two different Reynolds numbers (Re=100 and 200) and four different values of distance between steps (0.1, 0.15, 0.2 and 0.25 m). The results show that flow will separate and reattach in two different regions. The location and size of re-circulation zones depend on the Reynolds number. As Reynolds number is increased, the re-circulation zones before and after the step increased in their size. The re-attachment length after the second step was found increasing with increase in distance between the steps. It was found that, as the Reynolds number and the distance between the steps are increased, the 3D effects are getting more and more predominant.
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