[Nek5000-users] Problem with Spatial Derivatives of field

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

Hi Neks,

I'm having some problems with computing the gradients of vorticity.

So what I do in the usercheck is something like :



call call comp_vort3(vort,work1,work2,vxp,vyp,vzp)   ! Computing 
vorticity of perturbations

call gradm1(derivvortx,derivvorty,derivvortz,vort(1,1))



However, by doing this I do observe some abnormal results when I plot 
the fields : derivvortx, derivvorty, derivvortz.

Attached you will find a snapshot of the magnitude of derivvortx and 
derivvorty (obtained using paraview)

I am wondering why I am having extremely high values a the boudary of 
the elements. Has anyone noticed or faced such a problem?


Even when I increase lx1, reduce dt and reduce the mesh size, the 
problem remains..


Thank you for your time,

Best wishes,


Arnold




-- 

*Arnold Wakim*
Doctorant,
Département d´Aérodynamique Fondamentale et Expérimentale
Tél: +33 1 46 23 51 83


ONERA - The French Aerospace Lab -Centre de Meudon
8, rue des Vertugadins - 92190 MEUDON

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