Parallel Processing ocean wave multiphase model

robb · July 26, 2010, 12:39

Dear All,

I have successfully produced free surface waves using a multiphase setup in both 2D and 3D using CFX 11. The models have very conservate parameters and run fine on 1 processor, but as soon as i submit the same model in parallel it fails. The out file shows successful partitioning, and implimentation of MPICH communication on the cluster. I have tried standard MeTiS partitioning and coupled (-part-coupled on linux script). I was wondering if there were any tips for this such as partition weighting or partition algorithym that anyone has for multiphase parallel solving?
At the moment the models run using a single processor, but as soon as i attempt to parallel solve the same model, it fails on the first few iterations, any idea what i am missing?

Thanks!

rob

stumpy · July 26, 2010, 15:37

Check that your partition boundaries do not line up with the free surface. If you write out a backup/res file after 1 timestep, then plot isosurfaces of partition number in Post. If they do line up, then try a user specified direction partitioning option.

July 26, 2010, 12:39	Parallel Processing ocean wave multiphase model	#1
robb New Member Rob Stringer Join Date: Jul 2010 Posts: 1 Rep Power: 0	Dear All, I have successfully produced free surface waves using a multiphase setup in both 2D and 3D using CFX 11. The models have very conservate parameters and run fine on 1 processor, but as soon as i submit the same model in parallel it fails. The out file shows successful partitioning, and implimentation of MPICH communication on the cluster. I have tried standard MeTiS partitioning and coupled (-part-coupled on linux script). I was wondering if there were any tips for this such as partition weighting or partition algorithym that anyone has for multiphase parallel solving? At the moment the models run using a single processor, but as soon as i attempt to parallel solve the same model, it fails on the first few iterations, any idea what i am missing? Thanks! rob

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July 26, 2010, 15:37		#2
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	Check that your partition boundaries do not line up with the free surface. If you write out a backup/res file after 1 timestep, then plot isosurfaces of partition number in Post. If they do line up, then try a user specified direction partitioning option.