[Nek5000-users] Different velocity values in different 'v' inlets

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

You set ux=1.0 after your if-test...?

On 12/31/2017 07:34 PM, nek5000-users at lists.mcs.anl.gov wrote:
> Hi all,
>
> I'm trying to simulate a shear-layer which involves two different jets
> emerging at different velocities. The simulation is 2D for now. The
> width of the first jet extends from y=0.0 to y=1.0 and the second
> extends from y=1.0 to y=3.0
>
> I generated a mesh using genbox with 'v' BCs for both inlets.
>
> In the .usr file I have the following form for usrbc
>
>  subroutine userbc (ix,iy,iz,iside,ieg)
> c     NOTE ::: This subroutine MAY NOT be called by every process
>       include 'SIZE'
>       include 'TOTAL'
>       include 'NEKUSE'
>       if (ym1(i,j,k,e).lt.1) then
>           ux=10.0
>       elseif (ym1(i,j,k,e).gt.1) then
>           ux=1.0
>       endif
>       ux=1.0
>       uy=0.0
>       uz=0.0
>       temp=0.0
>       return
>       end
>
> As you can see I try assigning ux = 10.0 and 1.0 to the different zones.
> However the results show a uniform value of 1.0 across both the inlets.
> What am I missing here?
>
> Sincerely,
> --
>
> *Amitvikram Dutta*
>
> Graduate Research Assistant
>
> Fluid Mechanics Research Lab
>
> Multi-Physics Interaction Lab
>
> University of Waterloo
>
>
>
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