when calculating a Reynolds number for an obstacle in wind tunnel(adsbygoogle = window.adsbygoogle || []).push({});

Re = air density * air velocity * D / Dynamic viscosity

D here is the characteristic length of the immersed body ( frontal length ) 2 dimensional problem

Or the Hydraulic diameter which relates the tunnel dimensions to the characteristic length of the immersed body ?

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# Aerospace Calculating Reynolds number in wind tunnel

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