[Nek5000-users] how to define boundary conditions with a specified function.

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

Hello Neks,

Again, since  u=2*x, then u_x=2, the boundary conditions for uy should be 
v_y = -u_x = -2. 
when I set the boundary type as "v" and it is aligned/parallel with X-axis. the value of uy will be equal to zero by default. So in this case is it feasible to set "v" as boundary type?

I find here http://lists.mcs.anl.gov/pipermail/nek5000-users/2011-April/001312.html
and http://lists.mcs.anl.gov/pipermail/nek5000-users/2010-December/001184.html
have a similar question with mine.  Is there someone can give me some advices? thank you!!

Wei



On Jun 17, 2014, at 6:42 PM, nek5000-users at lists.mcs.anl.gov wrote:

> Thanks you Paul, for your so quickly response and help!!. It works.
> 
> Wei
> On Jun 17, 2014, at 5:36 PM, nek5000-users at lists.mcs.anl.gov wrote:
> 
>>          ux=0
>>          uy=0
>>          uz=0
>>          eps = 1.e-4
>>          if (abs(y-1.).le.eps) ux=2*x
> 
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