[sri_fmlab]

Hi,

Please help me in setting the appropriate boundary conditions in my simulation.

I am simulating a flow through a tank having one INLET and two OUTLETS. Water is entering the tank at 1m/s velocity and leaving the tank through OUTLET1 which is maintaining at 18000pascals. The pressure inside the tank is 2700pascals and it is maintained by air evacuation through OUTLET2. So pressure at OUTLET is 2700 pascals. The backflow is happening in my simulations because of pressure variation from out let to inlet. please see my attached boundary conditions.

My question is what kind of boundary condition for Alpha, p and u should i specify to develop a water column and make the flow out with out backflow.

Thanks in advance

regards
Sri

[seju]

hi srirao
please change U BC follow this method and give me your results.
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
{
walls
{
type fixedValue;
value uniform (0 0 0);
}
inlet
{
type fixedValue;
value uniform (0 1 0);
}

outlet1
{
type inletOutlet; //fluxCorrectedVelocity;
value uniform (0 0 0);
inletValue uniform (0 0 0);
}
outlet2
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}
simmetry
{
type fixedValue;
value uniform (0 0 0);
}
wall1
{
type fixedValue;
value uniform (0 0 0);
}
wall2
{
type fixedValue;
value uniform (0 0 0);
}
}