OpenFoam VolumeOfFluid Problem with contactAngle on movingWallWall
 

Dear comunity,

currently i am on a project of modeling a slot die coating process. I am using interFoam. My Fluid come out of the die ( direction minus x ) and will be coated on an moving substrat (movingWall) (movement to positiv y ). The force g is (-9,81 0 0)

in the following, i posted my BC.

Now my problem is, that i have a thin air-film between the coated fluid and my substrat. My substrate is not wetted but it should.

Is this caused by a wrong pressure BC on movingWall? Or is there a bether velocityBC than movingWallVelocity?

I already tried a refined mesh, but nothing has changed.



FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object alpha.water;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 0 0 0 0 0 0];

internalField uniform 0;

boundaryField
{
movingWall
{
type constantAlphaContactAngle;
theta0 120; //
limit alpha; //gradient ; none
value uniform 1;
}
fixedWalls
{
type constantAlphaContactAngle;
theta0 60; //
limit gradient;
value uniform 1;
}

frontAndBack
{
type empty;
}
inlet
{
type fixedValue;
value uniform 1;
}
outlet
{
type inletOutlet;
inletValue uniform 0;
value uniform 0;
}
}


// ************************************************** *********************** //


FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p_rgh;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform 0;

boundaryField
{
outlet
{
type totalPressure;
p0 uniform 0;

}

movingWall
{
type fixedFluxPressure;
}


wall
{
type fixedFluxPressure;
}

inlet
{
type fixedFluxPressure;
}

frontAndBack
{
type empty;
}


}

// ************************************************** *********************** //


FoamFile
{
version 2.0;
format ascii;
class volVectorField;
location "0";
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform (0 0 0);

boundaryField
{
movingWall
{
type movingWallVelocity;
value uniform (0 0.08333 0);
}
fixedWalls
{
type fixedValue;
value uniform (0 0 0);
}
frontAndBack
{
type empty;
}
inlet
{
type fixedValue;
value uniform (-0.023 0 0);
}
outlet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}
}