Setting constantAlphaContactAngle in interMixingFoam

kage · September 11, 2019, 15:59

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?

kage · September 15, 2019, 06:43

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)

September 11, 2019, 15:59	Setting constantAlphaContactAngle in interMixingFoam	#1
kage New Member Chan Kwok Hoe Join Date: Sep 2019 Posts: 3 Rep Power: 7	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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September 15, 2019, 06:43		#2
kage New Member Chan Kwok Hoe Join Date: Sep 2019 Posts: 3 Rep Power: 7	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)