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Old   April 4, 2010, 21:35
Default Set liquid level in a Tank
  #1
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Benjamin
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Hello! I want to simulate a two phase mixing tank (air-water). I want to set the water level at a high of 0.26 meters in the y direction in the tank before the operation starts.
My overall domain is: (-0.129986 0 -0.129999) (0.13 0.35 0.129999)
I want to simulate two cases:
1. Without airation, using MRFSimpleFoam.
2. With airation, using MRFTwoPhaseEulerFoam.
For the first case I don't know how to set the liquid level.
For the second case I have tried setFields, but I don't know if it is correct. My setFieldsDict is:

regions
(
boxToCell
{
box (-0.129986 0 -0.12.9999) (0.13 0.26 0.12999);
fieldValues
(
volScalarFieldValue alpha 0
);
}
);
Could anybody help me to set the liquid level in the first case and say to me if in the second case the configuration is ok?
Thanks in advance.
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Old   April 6, 2010, 04:07
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ngj
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Niels Gjoel Jacobsen
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The alpha value should be set to 1 not 0.

Best regards,

Niels
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Old   April 6, 2010, 10:52
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Piotr Prusinski
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Try something like this:
Code:
defaultFieldValues (
      volScalarFieldValue alpha1 0 // default value for the domain

  );
  regions
 (
      boxToCell
      {
    box (-0.129986 0 -0.12.9999) (0.13 0.26 0.12999);
    fieldValues
    (
      volScalarFieldValue alpha1 1 // value for the specified region
   );
   }
 );
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Old   April 6, 2010, 19:39
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Benjamin
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But alpha is the dispersed phase volume fraction right? so if i put alpha equal to 1 it is like if my tank is fill with air, not with water I think. I am confused. Correct me if I am wrong. Thank you for your reply.
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Old   April 6, 2010, 23:46
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Alberto Passalacqua
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Hello,

MRFSimpleFoam is a single-phase solver, so you cannot specify the level of the liquid, since there is only one phase.

I assume MRFTwoPhaseEulerFoam is your extension of twoPhaseEulerFoam, since I've not seen a solver with that name :-)

However you are correct: alphas is the volume fraction of the dispersed phase.

As suggested above, setFields should work to set alpha. Take a look at the examples for twoPhaseEulerFoam.

Best,
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