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Velocity drop over backward facing step

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Old   February 9, 2012, 09:52
Default Velocity drop over backward facing step
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Velocity will drop over step height at backward facing step. However, the drop rate differ if the inlet velocity changed, that is Reynolds Number changed.



Can someone explain why the velocity drop more gradual if Re increase, while low Re will have sharper velocity drop rate? Thanks in advanced.
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Old   February 9, 2012, 16:06
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Have you looked at the flow fields? I think you will find as you increase Re number over this range the separation gets more pronounced, meaning that the velocity slow down and pressure recovery associated with the flow over the step gets spread over a longer distance.
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Old   February 9, 2012, 21:24
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Yes, the recirculation zone size increase with Re. Thanks for your explanation.
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