alpha1 is unbounded

GerhardHolzinger · October 17, 2012, 05:48

Hello,

I am trying to simulate a bubble column with twoPhaseEulerFoam. When running my case alpha1 reaches values that should not be possible.

Code:

Courant Number mean: 0.00734422 max: 0.637501
Max Ur Courant Number = 0.453228
Time = 0.675

MULES: Solving for alpha1
Dispersed phase volume fraction = 0.000455625  Min(alpha1) = -0.00187942  Max(alpha1) = 1
MULES: Solving for alpha1
Dispersed phase volume fraction = 0.000455625  Min(alpha1) = -0.540265  Max(alpha1) = 1

There is some checker-boarding next to the inlet. Does anyone have some tips how to eliminate that.

akidess · October 17, 2012, 06:25

Try using a much smaller time step.

October 17, 2012, 06:25		#2
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 30	Try using a much smaller time step. __________________ On twitter @akidTwit Spend as much time formulating your questions as you expect people to spend on their answer.

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