[Nek5000-users] Set gradient and/or pressure at outlet

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

Dear Juan Pablo,


The documentation I pointed you to is for constant density Boussinesq and the change in density to which I refer is the first-order perturbation that sets up the free convection. (Otherwise, you have no natural convection.)


If you have outflow conditions you will need to do as suggested in that document.


If you don't have outflow conditions then there is something else going on.

Since you talk about vortices leaving the domain I was assuming you have outflow, but maybe that's not the case.


If you'd like, feel free to send me the case files off-list and I can take a look.


Paul


________________________________
From: Nek5000-users <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, December 27, 2017 7:28:25 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] Set gradient and/or pressure at outlet

Thanks Paul for the answer. Yes, I'm using Boussinesq approximation, but using incompresible equations, there are no stratification in the density, like the equations you mention. But, anyway, I'm more interested in setting the spatial gradient equal to cero in the boundary. ¿How can I achieve that?

dUy/dy=0

dTEMP/dy=0


Thanks a lot,
Juan Pablo.
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