Sorry to spam. I could solve the issue. W ,W ,W ,w V bc's ! west,east,south,north,bottom,top should be changed to W ,W ,W ,v V bc's ! west,east,south,north,bottom,top So just a typo in boundary conditions. On 1/18/2016 8:07 PM, [email protected] wrote:

Hi Neks,

I'm trying to solve a simple 2D cavity problem with Nek and I've got the following error:

EXIT: E INVALID BC FOUND in genfast 64

* For your info here is the genbox script I used for the mesh:

test5.rea 2 spatial dimension 1 number of fields # #======================================================================= # box_1 1st character .ne. "c" or "C" -8 -8 1 nelx,nely,nelz 0 1 1 x_0 x_Nelx ratio 0 1 1 W ,W ,W ,w V bc's ! west,east,south,north,bottom,top

* Also, this is the userbc part in user file:

c----------------------------------------------------------------------- subroutine userbc (ix,iy,iz,iside,ieg) include 'SIZE' include 'TSTEP' include 'INPUT' include 'NEKUSE'

ux=1. uy=0.

return end

This should be a straightforward problem but am not sure which part I'm getting wrong. Any advice is appreciated. Hopefully, I can make a sample tutorial for this well-known problem and share with new comers.

Thanks, Saleh

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