[Nek5000-users] PN/PN and usrdiv

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

Hi Markus,

In your first sets of tests, did you notice that your
peak speed went up dramatically ?  ...  In most of my
cases I notice that the outflow velocity is "red" (i.e.,
fast) because of this condition.

I'll check this w/ PnPn.

Paul


On Fri, 9 Apr 2010, nek5000-users at lists.mcs.anl.gov wrote:

> Hi,
>
> since I switched the pressure scheme from P_N/P_N-2 to PN/PN, as recommended 
> by an earlier email, I have divergence trouble (simulation crashes) at the 
> outflow, were a stabilization technique as in examples "peris" and "jet" is 
> in place (adding divergence via usrdiv).
> I spent a long time trying to fix this (several test runs with increased 
> outflow normal element length, increased divergence magnitude, mesh 
> deformation to nozzle shape, which avoids crashing but has an adverse effect 
> on the upstream flow,...) but I am becoming suspicious that usrdiv is just 
> not used in PN/PN.
> Is that true? If so, how to fix it?
>
> Thanks,
> Markus
>
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