[Nek5000-users] Outlet boundary treatment

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

Hi omid,

To simulate turbulent flows, I guess you can use the sub routine 
turb_outflow().
Take a look at expansion.usr file in expansion example.

Best,Kamal


On 14/04/2014 17:17, nek5000-users at lists.mcs.anl.gov wrote:
> Dear Neks,
>
> I want to simulate turbulent flow in a stenosis, and use outflow 
> boundary condition at the outlet. Because of the possible backflow at 
> the outlet in this case, I want to impose div U>0 at the last layer of 
> the outlet.
>
> I have already seen an example in NEK5000 website (peris) which uses 
> the same boundary condition as I want to impose.
> In this example, three subroutines are mentioned as the names of the 
> following to apply this boundary condition:
> *fill_div(div)*
> *set_outflow_dist*
> *get_div_const(cdiv)*
> Now, I intend to use the same outlet B.C for a case the same as 
> stenosis in pipe example. The both examples; pipe and peris, have 
> similar geometries. So, may I use these subroutines exactly in the 
> .usr file of stenosis case? or I should do any modification in this case.
>
> Thanks so much in advance.
>
> Omid
>
>
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