CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (http://www.cfd-online.com/Forums/openfoam-solving/)
-   -   alpha1 is unbounded (http://www.cfd-online.com/Forums/openfoam-solving/108205-alpha1-unbounded.html)

GerhardHolzinger October 17, 2012 04:48

alpha1 is unbounded
 
2 Attachment(s)
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 05:25

Try using a much smaller time step.


All times are GMT -4. The time now is 09:47.