[Nek5000-users] userf / pressure drop BC

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

Michael,

Depending on your domain, this should be possible with
recycling and/or periodic bcs.

It's crucial to understand your outflow conditions...

If you tar your .usr/.rea/SIZE file and send off-list
I'll take a look with Aleks, who's been working on the
recycling stuff.

Thanks,

Paul


On Mon, 16 Aug 2010, nek5000-users at lists.mcs.anl.gov wrote:

> Hello,
>
> I am having an issue with one of my simulations, where the flow wants to change directions. A brief description for the domain is:
>
> - Two inlets, one in the x-direction, the other in the z-direction.
> - The two inlets "feed into the main domain"... that is I give both an initial condition, and then apply a recycling BC to each individually.
>
> My question is: Is there a simple fix for this by use of the userf routine in the user file? I haven't used it before. What I ideally would like to do, is apply some pressure drop across the inlets or something to keep the flow from changing directions. I messed around with the initial conditions, and through some tweaking was able to get one of the inlets to work, but would like something more robust.
>
> Sorry if this doubles up on a previous question, I couldn't find any old messages about this and also I think the archive is down on the website.
>
> - Michael M.
>
>