[Nek5000-users] variable density incompressible flow

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

Hi Navin,

It's not clear that nek will be the right tool for this... Depends
on what you're after.  If your flow is incompressible, I don't see
why you need a source term for the divergence, since one can have
div.U=0 even if rho is variable.  That being said, there is a usrdiv
array that you can fill.  See the peristaltic flow exampe in

nek5_svn/examples/peris/peris.usr

Look for "div"

Paul



On Sat, 9 Jul 2011, nek5000-users at lists.mcs.anl.gov wrote:

> Hi
>
> I am a total newbie with regards to nek5000. I want to simulate a variable
> density incompressible flow where the variation in density is brought about
> by the motion of an interface separating two fluids. The interface is tracked
> via a level set method. To achieve this, an appropriate source term is added
> in the continuity equation, thus making the velocity field divergent.  To do
> this using nek5000, I need to know how to input a user defined divergence of
> velocity. Could anyone throw some light on this or guide me to some
> documentation/example which would help me?
>
> Thanks,
> Regards.
>
> -Navin Fogla
>
>
>
>
>
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