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Phase segregation in multiphaseInterFoam

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Old   April 15, 2010, 08:42
Unhappy Phase segregation in multiphaseInterFoam
  #1
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Søren
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Hey guys,
I have a problem. I'm currently simulating a 3 phase injectionmolding process in OpenFoam using multiphaseInterFoam, and the phases keep segregating. I have tried adjusting the sigmas in the transportProperties and the alphaContactAngle in my alphaair. How do i adjust the phases compatibility so they don't segregate so violently?


t=0



t=0.001
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Old   April 15, 2010, 09:38
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Claus Meister
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Have yet tried to simulate without any contact angles, i.e. zeroGradient at all walls?

Furthermore, could you post transportProperties, U and p.

I would like to take a closer look
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Old   April 16, 2010, 06:52
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Søren
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Thanks for your reply!

I just tried that and it still goes zebra on me...

Here is the code. Some is from the damBreak4phase case. I also have at problem with floating point exception when I increase the viscosity of the binder or the powder.

Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [1 -1 -2 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
    type            zeroGradient;
    }

    left
    {
        type            fixedValue;
        value           uniform 0;
    }

    right
    {
        type            fixedValue;
        value           uniform 0;
    }

    defaultFaces
    {
    type            zeroGradient;
    }
}
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volVectorField;
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 1 -1 0 0 0 0];

internalField   uniform (0 0 0);

boundaryField
{
    inlet
    {
    type            fixedValue;
    value        uniform (0 -2 0);
    }
    left
    {
        type            zeroGradient;
    }
    right
    {
        type            zeroGradient;
    }
    defaultFaces
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
}
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      transportProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

phases          ( 
powder { transportModel Newtonian ; 
nu nu [ 0 2 -1 0 0 0 0 ] 1e-03 ; 
rho rho [ 1 -3 0 0 0 0 0 ] 7800 ; } 

binder { transportModel Newtonian ; 
nu nu [ 0 2 -1 0 0 0 0 ] 0.1 ; 
rho rho [ 1 -3 0 0 0 0 0 ] 1000 ; }

air   { transportModel Newtonian ; 
nu nu [ 0 2 -1 0 0 0 0 ] 1.48e-03 ; 
rho rho [ 1 -3 0 0 0 0 0 ] 1 ; } );

refPhase        air;

sigmas          ( ( air binder ) 0 ( air powder ) 0 ( binder powder ) 0 );
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Old   May 7, 2010, 04:10
Default Immiscible phases...
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Søren
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Apparently I have missed that multiphaseInterFoams phases are immiscible. So this solver can't be used to simulate segregation in metal injection moulding.
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