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Old   August 27, 2010, 15:35
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Dear Foamers,
What is the meaning of Co number in the pisoFoam for example.
what should be its range? is it important in implicit methods?
i know it is for stability. how much it can be large?
please talk about the role and magnitude of this number in solving methods.
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Old   August 30, 2010, 02:13
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Read Peric or Patankar about the PISO method and you will see assumptions are made that require a Courant number limit. This is independent of the implicit / explicit time marching scheme. For an incompressible flow you should get away with Co < 1, but there are cases (eg. VOF) that may require an even tighter criterion to produce nicer results.
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