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Old   May 15, 2013, 10:34
Default SU2 running problem
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andrea ciarella
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Hi,

I am trying to run SU2 (both compressible and incompressible) but
I have problem on running it in parallel. My mesh is highly anisotropic and unstructured. the code perform really well in terms of accuracy on 1 core (onera m6 testcase with y+1) but if I try to run it in parallel it stops after the partitioning with no error message just a MPI general error.
What do I have to do?
Thanks
ANdrea
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Old   May 15, 2013, 11:10
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Francisco Palacios
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Quote:
Originally Posted by andrea.ciarella View Post
Hi,

I am trying to run SU2 (both compressible and incompressible) but
I have problem on running it in parallel. My mesh is highly anisotropic and unstructured. the code perform really well in terms of accuracy on 1 core (onera m6 testcase with y+1) but if I try to run it in parallel it stops after the partitioning with no error message just a MPI general error.
What do I have to do?
Thanks
ANdrea
We need more details, could you please send us the screen output.

Thanks for using SU2,
Best
Francisco
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Old   May 16, 2013, 04:26
Default onera m6
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andrea ciarella
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Thank you for your reply
My problem arise because I don't have any error message, just a general mpi error.
I can use SU2_DDC to generate the domain decomposition but when I run SU2_CFD in parallel it just cash before starting (this is with the compressible solver).
In the picture you can see the problem with the incompressible solver. I can run the firstiterations than the simulation diverges. It seems that the problems is in the connection area.

Thank you
Andrea
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Old   May 16, 2013, 11:07
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Hi Andrea,
Just a suggestion, why not try different number of partitions i.e no of processors.
May be first start your simulation with the single grid for few iterations.
May be use the explicit formulation initially.
What turbulence model you use or it is an Euler computation. A little bit more detail, may be a snapshot of your residual history might be helpful.

Hope this helps.
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Old   May 16, 2013, 11:32
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andrea ciarella
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thanks for the suggestion, my simulation is the onera m6 testcase (SA turbulence model, M= 0.83 and Re=11.7e6), using only a fine mesh with y+=1. If I run with just one processor I get really good results but take ages. My problem cames if I try to use the same mash for running in parallel. it don't start or diverges. These no residual history because there are few iteration.
For the incompressible case I generate a rectangular wing (naca 6510) and try to run at 3 degree aoa. it seems that it sepates a lot and is not converging.
I am trying two new test and it seems that the incompressible wing are slowly converging but I am not sure now.
My mesh is around 250MB (1.8 millions points)
I am running in single grid mode.
Andrea
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Old   May 16, 2013, 15:02
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Hi Andrea,
I think you can also try to use small CFL numbers in combination with the Euler mode and when the simulation stabilizes then change to the Navier Stokes solver with the SA turbulence modelled.
One more thing, which descretization scheme are you using? Upwind or Central.
I would start with first order upwind and then later on choose the 2nd order upwind.
As suggested earlier, you can also try to change the number of processor for the parallel simulation.

good luck.
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compressible solver, incompressible, onera m6, parallel computation, su2

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