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Setting constantAlphaContactAngle in interMixingFoam

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Old   September 11, 2019, 15:59
Default Setting constantAlphaContactAngle in interMixingFoam
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Chan Kwok Hoe
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Dear all,

I'm new to OpenFOAM, using OpenFOAM 7. I've managed to simulate a simple drop of water on a flat surface using the interFoam function.

I moved on to trying the interMixingFoam function as I needed to simulate some mixing of liquids on a hydrophobic flat surface. However, I was unable to set the contact angle. The simulation runs fine though.

I placed the following inside the boundaryField for alpha.water.orig

Code:
    walls
    {
        type            constantAlphaContactAngle;
        theta0          157.5;
        limit           gradient;
        value           uniform 0;
    }
Instead of getting the original stated 157.5 contact angle as per simulated using interFoam, the contact angle seemed more like 90 degrees using interMixingFoam.

Am I doing something wrong here?
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Old   September 15, 2019, 06:43
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Chan Kwok Hoe
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Just realised what went wrong. While I set the theta0 for the water, the theta0 for air was set to zeroGradient. As a result, the theta0 for the water phase was probably overwritten.

In order to get the results I needed, the theta0 for the air phase was also explicitly defined, similarly to the water phase (though 180-waterContactAngle)
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