Notes for running case in OpenFOAM
Decomposition methods in parallel
Posted April 23, 2013 at 01:05 by Tushar@cfd
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 given "number of subdomain = 2; processor weights (1 1)" :
We took poiseuille flow with change diameter, with very fine mesh generated using OF.Intel Core 2 Duo E8400 / 3.0 GHz processor was used during simulation.
Results:
SimpleCoeff method took 7.17 hrs(computation time).
On the contrary, Scotch method took 4:48 hrs(computation time).
Later, It was found that Scotch method was faster in computation.
Note:
Processor weights do have a impact on decomposition method, always try to minimise the weights of processors for improving computation time.
(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 given "number of subdomain = 2; processor weights (1 1)" :
We took poiseuille flow with change diameter, with very fine mesh generated using OF.Intel Core 2 Duo E8400 / 3.0 GHz processor was used during simulation.
Results:
SimpleCoeff method took 7.17 hrs(computation time).
On the contrary, Scotch method took 4:48 hrs(computation time).
Later, It was found that Scotch method was faster in computation.
Note:
Processor weights do have a impact on decomposition method, always try to minimise the weights of processors for improving computation time.
Total Comments 1
Comments
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Good work. Thanks.Posted April 30, 2013 at 05:43 by skeptik
