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Forum: OpenFOAM

June 6, 2013, 12:43

Replies: 35

Small time step in interFoam

Views: 20,190

Posted By kwardle

No, I suggest: maxCo=2.0 maxAlphaCo=1.0 ...

No, I suggest:
maxCo=2.0
maxAlphaCo=1.0
nAlphaSubCycles=5

Forum: OpenFOAM

June 6, 2013, 11:46

Replies: 35

Small time step in interFoam

Views: 20,190

Posted By kwardle

So when you say Courant number are you meaning...

So when you say Courant number are you meaning maxCo or maxAlphaCo? interFoam should print out both values.

...
Courant Number mean: 0.0785872 max: 0.47472
Interface Courant Number mean:...

Forum: OpenFOAM

June 6, 2013, 11:09

Replies: 35

Small time step in interFoam

Views: 20,190

Posted By kwardle

This precisely why you use sub-time stepping on...

This precisely why you use sub-time stepping on alpha. So if you set maxAlphaCo to 0.5 and nAlphaSubCycles is 3 then you have a Co per alpha step of 0.5/3 = 0.167. This is why I say use 1.0/5 =...

Forum: OpenFOAM

June 6, 2013, 10:42

Replies: 35

Small time step in interFoam

Views: 20,190

Posted By kwardle

If you are using the solver settings from the...

If you are using the solver settings from the tutorials, you may have the maxCo and maxAlphaCo both set to 0.5. I typically will push these to 2.0 and 1.0 (at least) and then set nAlphaSubCycles to...

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