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[Sponsors] |
August 27, 2010, 15:35 |
courant number
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#1 |
Senior Member
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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. Regards, Maysam |
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August 30, 2010, 02:13 |
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#2 |
Senior Member
Anton Kidess
Join Date: May 2009
Location: Germany
Posts: 1,377
Rep Power: 30 |
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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