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-   -   alpha1 is unbounded (https://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.

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