r.m.s velocities calculation after sampled LES
 

Hello everyone
I've run LES case, I did data sampling, but I cannot find how to display or calculate axial r.m.s velocity u', only RMSE values are available.
Does anyone know what formula should I use to find rms velocities values
Thank you

The RMSE of u is equivalent to the RMS of u' because the mean of u' is 0.

Thank you LuckyTran for your reply, and I appreciate if you guide me to any reference telling this in fluent theory guide or elsewhere

It is verrry trivial. Just read up on RMS and RMSE


Note that the fluctuation velocity u' is the velocity u(t) with the mean subtracted out. People often mistakenly call u' the RMS velocity, which can add to the confusion.


The hint is that the RMSE of u' and the RMS of u' are the same. The mean of u' is 0. The RMS of the mean of a quantity is the same as the mean.

Yes that's true, just got confused from some posts saying random things :)
.. anyway, thanks again