[Nek5000-users] WSS on several processors

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

Hi Andrew,

torq_calc (which also computes drag as a byproduct) will generate integral quantities over several
objects.

So, you could have (say) the upper and lower wall as two separate objects, and you can get the
drag on each.   This amounts to 2 vector quantities (3 numbers each:  fx,fy,fz) at each time step
and is written out by node 0.

It sounds like you are asking for something different, e.g., the wall shear stress as a function of
position --- that requires a bit more sophistication but is certainly accessible.

What are you looking for?

Best, Paul

________________________________
From: nek5000-users-bounces at lists.mcs.anl.gov [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: Sunday, July 10, 2016 12:39 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: [Nek5000-users] WSS on several processors

Hi Neks,

I am working with two routines (torq_calc and drgtrq )in navier5.f. I'm trying  to collect viscous drag's values on the wall (in all the grid points) and write them into a file. If I run a calculation on the one CPU it works great, but it doesn't work with several processors: I have an impression that the information is written into result file from only one processors. How can I fix this problem?

Thank you for any suggestion,
Andrew
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