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pisoFoam faster in parallel after recomposition

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Old   June 16, 2013, 18:16
Default pisoFoam faster in parallel after recomposition
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Hi all,

I'm calculating a 3.6 millions hexahedrals case with SpalartAllmarasDDES (pimpleFoam in piso mode) in parallel on a sixteen cores cluster. I use GAMG for everything except the pressure correctors, for which I use GAMGPCG. I noticed that reconstructing and re-decomposing the domain reduces the calculation time per iteration by a 20% or more, and not only for a pair of time steps, it seems to remain stable for a while. Does anyone knows why, and if this practice affects the solution in any (bad?) way?
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