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Capillary Rise With bubbe inside problem

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Old   February 8, 2016, 20:15
Exclamation Capillary Rise With bubbe inside problem
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Rimsha
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Hi Foamers,

I am trying to model capillary rise in interFoam however during my simulation in a capillary with diameter 1e-3m and height 30e-3 there seem to be bubbles appearing at the bottom which is very strange.

I just wanted to see if anyone has any idea why might that be? please see photo attached to see the bug.

Kind Regards

Rimsha

bubble.jpg
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Old   February 11, 2016, 14:54
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Kyle Mooney
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Hi Rimsha,

Whats your boundary condition settings at the inlet?
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Old   February 11, 2016, 15:51
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Hi kmooney

thank you for the reply, i have the following inlet conditions:

alpha.water:

inlet
{
type inletOutlet;
value uniform 1;
inletValue uniform 1;
}

p_grh

inlet
{
type fixedValue;
value uniform 0;
}


velocity:

inlet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}
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Old   February 11, 2016, 15:52
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I would retry the case with alpha inlet bc as fixedValue 1 (instead of inletOutlet) and see if that helps.
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Old   February 11, 2016, 16:57
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Hiya,

I have tried that however the deltaT becomes very small and the simulation stops as co max is exceeded.

Therefore i am unable to get a solution.

Kind regards

Rimsha
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Old   February 12, 2016, 01:08
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Are you using setFields to set the first few cells in from the inlet to alpha=1? Some simulations have strange startup effects if there is an alpha=1 inlet and the cells just inside are alpha=0.
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Old   February 12, 2016, 11:26
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Yes i am using setFields, are you suggesting i should not use fields or use either one?
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