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OpenFOAM, has four methods of decomposition, namely:
(1) simple
(2) hierarchical
(3) scotch
(4) manual

As mentioned on the OpenFOAM website, "Scotch decomposition which requires no geometric input from the user and attempts to minimise the number of processor boundaries."

We tried to compare "simple" and "scotch" methods, in order to verify and here are the results for that:

Both the methods were...