[Nek5000-users] calculate gradients of fluctuation

[nek5000-users at lists.mcs.anl.gov]

Hi nek users,

For u=U + u’ where  U= mean streamwise velocity and u’= fluctuation of streamwise velocity

I know how to calculate du/dx , du/dy and du/dz. But how can I calculate gradients of the fluctuation of streamwise veloctity, i.e. du’/dx , du’/dy , du’/dz ?

Thank you.
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