[Nek5000-users] NekNek with PN-PN

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

We have used neknek + pn/pn in the past.

Also, coupling the pressure is possible with both... we've done that also.

Unfortunately, I'm totally tied up till mid-week next week so cannot look at this until then.

Paul

________________________________________
From: nek5000-users-bounces at lists.mcs.anl.gov [nek5000-users-bounces at lists.mcs.anl.gov] on behalf of nek5000-users at lists.mcs.anl.gov [nek5000-users at lists.mcs.anl.gov]
Sent: Wednesday, March 29, 2017 6:37 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] NekNek with PN-PN

That’s correct. Neknek is not currently implemented with Pn/Pn formulation. However, there are some ways around it if you use outflow boundary conditions instead of interpolation at the outflow boundaries. I am not sure if this example is in repo, but it should be doable, if this is what you need.

Yulia


On Mar 29, 2017, at 4:10 AM, nek5000-users at lists.mcs.anl.gov wrote:

> Dear Nek users,
>
> I am coupling Navier-Stokes and Darcy equations using NekNek. I need to pass pressure from Navier-Stokes as the boundary condition for Darcy equation. Pn/Pn-2 formulations extrapolate pressure to GLL nodes and apply dsavg to compute C-0 continuous pressure field. Though the resulting pressure field is continuous it is not very smooth and exhibits oscillations near each element boundaries. Using this as the boundary condition for Darcy equation gives raise to convergence issues after some time steps. I tried to use neknek with Pn/Pn formulation which will avoid this problem. However, I endup with "ERROR: .... crs_solve: invalid handle" and the simulation breaks away after the first time step in "happy_check" subroutine.
>
> Is Neknek not implemented for Pn/Pn formulations?
>
> Thank you very much for your response,
>
> Best regards,
> Sudhakar
> Linne FLOW centre.
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> Nek5000-users at lists.mcs.anl.gov
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