[Nek5000-users] Pipe example - Strange velocity/pressure signals

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

Dear Outi,

What value of lx1 and lx2 were you using?

I'm not observing the phenomenon you report.
I have:

lx1=6
lxd=9
lx2=lx1-2
lx3=lx2

...

Once I know your SIZE parameters I can retry.

Best, Paul


On Sun, 2 Mar 2014, nek5000-users at lists.mcs.anl.gov wrote:

> Dear Neks,
> 
> We are interested to do a smoothly deformed axisymmetric geometry, much
> like the pipe/stenosis example in the repository.
> So, we added hpts probes in the pipe example, and modified nothing else,
> but this turns out to give strange values initially. The first probe sits
> 3 diameters downstream of the stenosis throat (z=3), and gives U=0.48 at
> the first time step, despite zero initial condition. The pressure in this
> position shoots up to very high values too, so maybe a spurious pressure
> peak is the cause?
> 
> Could you please help us to understand/prevent this phenomenon? The .usr,
> hpts.in and essential parts of .rea are attached. We are using revision
> 1008.
> This would be important for us as we aim to use Nek5000 to study
> transient as well as steady state dynamics of similar flows.
> 
> Thank you in advance!
> Outi
> 
> 
> 
> 
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