Physics Asked by Thomas Wagenaar on May 18, 2021
The Reynolds number is given by
$$mathrm{Re} = frac{v_{rms} L}{nu}$$
Now imagine we fix $L$, $nu$ and $v_{rms}$ – so the Reynolds number is constant. Imagine two different flows:
$$(1): bar{v} = 10, v_{rms}=1$$
$$(2): bar{v} = 20, v_{rms}=1$$
So we have a flow with 10% turbulence intensity and a flow with 5% turbulence intensity. Both these flows have the same Reynolds number, but a different mean flow velocity. Can we differentiate these two flows considering that we do not know $bar{v}$? In other words, a hypothetical situation in which we can only measure the fluctuations $v_{fluc}$.
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