Running Case in Parallel
Hello,
i wanted to run the Case "damBreak" in Parallel on 6 Processors. But when i excecute my Allrun file the calculation just finish really quick and i have no time directory or processor0, processor1... directorys in my case directory. First I changed the decomposeParDict like this: Code:
/*--------------------------------*- C++ -*----------------------------------*\ Code:
#!/bin/sh Code:
/mnt/c/users/typus/tutorials/multiphase/interfoam/laminar/damBreak/damBreak$ ./Allrun |
Some output from OpenFOAM would be helpful.
You need to run blockMesh before decomposePar You should have processor dirs if decomposePar ran. And if that was successful, you should have 0 dirs in each of the processor dirs if setFields ran. You don't need to use setFields in parallel. Can't you just stick with the regular tutorial? Code:
runApplication blockMesh |
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I have one more question.
Is there a way to omptimize the decomposePar if you for example have 40 Processors then you can split them up in different ways in: n (10 1 4) n (5 4 2) ...and so on is there a way to find the best allocation? With the shortest simulation time? |
You are doing a tutorial, why worry about these things...
The answer is no, there isn't. At least, there isn't a magic wand like you want. The time it takes you to find the best mesh with fastest possible simulation time I can almost certainly guarantee will be longer than the time it takes you run the case even with a bad mesh partitioning. When you move on to doing productive simulations with more complex geometry, you'll likely stop using simple and move on to things like scotch and metis. Even still, the time it takes to solve a given partition depends also on what is being solved in the partition. You could have multiple physics for example and then one partition ends up being solved much faster than another. Even with a single set of physics, the time it takes to solve the same partition is dependent on the flow itself. To complicate things even further, the time it takes to solve each partition is also dependent on your hardware... There's an endless list of things you need to optimize for to find the perfect mesh. |
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Ok so i have to test out whats the best allocation in the decomposeParDict. Thank you. |
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