Roshko number

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In fluid mechanics, the Roshko number (Ro) is a dimensionless number describing oscillating flow mechanisms. It is named after the American Professor of Aeronautics Anatol Roshko. It is defined as

 \mathrm{Ro} = {f L^{2}\over \nu} =\mathrm{St}\,\mathrm{Re}

where

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