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Showing results 1 to 11 of 11 Search took 0.00 seconds. Search: Posts Made By: pbohorquez

Forum: OpenFOAM Running, Solving & CFD January 15, 2010, 04:29

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez The communication libraries are given by... The communication libraries are given by $WM_MPLIB. Its value is set in OpenFOAM/OpenFOAM-1.6.x/etc/bashrc and can be tuned in OpenFOAM/OpenFOAM-1.6.x/etc/settings.sh

Forum: OpenFOAM Running, Solving & CFD January 14, 2010, 06:32

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez Are you using a shared or distributed memory... Are you using a shared or distributed memory machine? I think that I have reported successful results for HP...

Forum: OpenFOAM Running, Solving & CFD January 13, 2010, 17:25

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez First, the computational time for each time step... First, the computational time for each time step is mainly spent on solving for the pressure equation in almost all our simulations. This is the most expensive operation performed at every time step....

Forum: OpenFOAM Running, Solving & CFD January 13, 2010, 16:29

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez OK. Try to converge the solution at every time... OK. Try to converge the solution at every time step: Increase "nCorrectors" in system/fvSolution up to the required number in order to obtain the Initial residual of 'p' of order 10^{-3} at the...

Forum: OpenFOAM Running, Solving & CFD January 13, 2010, 16:12

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez Thanks. Now it's clear: Courant Number mean:... Thanks. Now it's clear: Courant Number mean: 5.23134e+77 max: 5.91045e+82 The simulation crashes because of the increase of the max Courant number that must lie below 1. Please change the time...

Forum: OpenFOAM Running, Solving & CFD January 13, 2010, 15:53

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez Are you getting that error at t=0 or later? It... Are you getting that error at t=0 or later? It works for me during the first time steps (later i stoped it) for a similar hardware and OF-1.6.x. Strange ... theoretically the time step...

Forum: OpenFOAM Running, Solving & CFD January 13, 2010, 08:08

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez Steve, to check the scaling it is not necessary... Steve, to check the scaling it is not necessary to recompile OF. However, you could compare the runtime with and without optimization options. To recompile OF: echo $WM_OPTIONS : I suppose you...

Forum: OpenFOAM Running, Solving & CFD January 12, 2010, 03:29

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez Yes, that's all. Have you tried decreasing the... Yes, that's all. Have you tried decreasing the number of cores/cells? Maybe the cache is a bottleneck. Are you using infiniband or similar? Could I know the hardware characteristics? ...

Forum: OpenFOAM Running, Solving & CFD January 12, 2010, 02:45

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez Just replace (20, 20, 1) with (200, 200, 200) and... Just replace (20, 20, 1) with (200, 200, 200) and edit the boundary conditions at t=0: - For the pressure: the face frontAndBack from empty to zeroGradient. - For the velocity: the face...

Forum: OpenFOAM Running, Solving & CFD January 11, 2010, 13:04

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez You can copy and edit the default file which is... You can copy and edit the default file which is located in the folder that follows: ~/OpenFOAM/OpenFOAM-1.5-dev/applications/utilities/parallelProcessing/decomposePar/decomposeParDict Please...

Forum: OpenFOAM Running, Solving & CFD January 11, 2010, 03:52

Replies: 26 OpenFoam parallel scalability Views: 9,748 Posted By pbohorquez You may try the Lid-driven cavity flow tutorial... You may try the Lid-driven cavity flow tutorial in order to compare your speed-up results (http://www.csc.fi/english/research/sciences/CFD/CFDsoftware/openfoam/of_murska_cray) with, for instance,...

Showing results 1 to 11 of 11

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