[sinhavivekananda318]

Hello foamer,
Greetings to you all.
I am trying to simulate the dispersed phase holdup in my pulsed extraction column with interFoam solver. This is a two phase flow. the continuous phase is water and the dispersed phase is kerosene.
Now, my column has two inlets (for water and kerosene) and two outlets (for the same). Please refer to the uploaded picture as my setup. i am using the following boundary conditions as follows:
U:
top
{
type zeroGradient;

}
aqinlet
{
type fixedValue;
value uniform (0.0833 0 0);
}
aqoutlet
{
type inletOutlet;
inletValue uniform (0 0 0);
value uniform (0 0 0);
}
orgin (kerosene inlet)
{
type fixedValue;
value uniform (0.0833 0 0);
}
orgout (kerosene outlet)
{
type inletOutlet;
inletValue uniform ( 0 0 0);
value uniform (0 0 0);
}
walls
{
type noSlip;
}
bottom
{
type uniformFIxedValue;
uniformValueCoeffs sin;
amplitude 9.6e-3;
frequency 1.
sacle (0 1 0);
level ( 0 0 0);
}
defaultFaces
{
type empty;
}

Pressure:
top
{
type totalPressure;
p0 0;
}
aqinlet
{
type fixedFluxPressure;
value uniform 0;

}
aqoutlet
{
type fixedFluxPressure;
value uniform 0;
}
orgin
{
type fixedFluxPressure;
value uniform 0;
}
orgout
{
type fixedFluxPressure;
value uniform 0;
}
walls
{
type fixedFluxPressure;
value uniform 0;
}
bottom
{
type fixedFluxPressure;
value uniform 0;
}
defaultFaces
{
type empty;
}

alpha.water:

top
{
type zeroGradient;
}
aqinlet
{
type fixedValue;
value uniform 1;

}
aqoutlet
{
type zeroGradient;

}
orgin
{
type fixedValue
value uniform 0;
}
orgout
{
type zeroGradient;

}
walls
{
type zeroGradient;

}
bottom
{
type zeroGradient;

}
defaultFaces
{
type empty;
}

Now the problem is after some time the upper interface starts moving upward (which it will) and floods the whole column which should not be the case at this low flowrate and pulsation frequency.

My doubt is about the outlet boundary conditions. As i know the inlet velocities so what should be the pressure boundary condition at the inlets and the outlets?
and what should i specify as the outlet velocity boundary condition?