simpleFoam and rhoSimpleFoam boundary conditions
Hello, I am a newbie to openfoam. After going though the tutorials, I am setting up a capillary gas flow where the inlet is at atmospheric pressure 101325 pascal and the outlet is at 300 pascal.
I know that the incomprssible simpleFoam use p/rho and compressible use absolute pressure. But I am not sure if the p and U settings I entered are correct. The simulation is running somehow, but I do not see mach cones, which are expected at the outlet of the capillary. It looks like a simple gas expansion. So I am worried about the boundary settings. Following are the boundary setting for simpleFoam and rhoSimpleFoam.
simpleFoam U:
Code:
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0 0);
boundaryField
{
inlet
{
type fixedValue;
value uniform (0 0 0.7);
}
outlet
{
type inletOutlet;;
inletValue uniform (0 0 0.7);
}
walls
{
type noSlip;
}
}
simpleFoam p:
Code:
dimensions [0 2 -2 0 0 0 0];
internalField uniform 216; //260/1.2;
boundaryField
{
inlet
{
type zeroGradient;
}
outlet
{
type fixedValue;
value uniform 216; //260/1.2;
}
walls
{
type zeroGradient;
}
}
rhoSimpleFoam U:
Code:
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0 0);
boundaryField
{
inlet
{
type flowRateInletVelocity;
massFlowRate constant 0.5; //I have a mesurement of mass flow rate //1.2 L/min. But just to test the code I used the default 0.5.
rhoInlet 0.5; // Guess for rho
profile turbulentBL;
}
outlet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}
walls
{
type noSlip;
}
}
rhoSimpleFoam p:
Code:
dimensions [1 -1 -2 0 0 0 0];
internalField uniform 260;
boundaryField
{
inlet
{
type zeroGradient;
refValue uniform 101325;
refGradient uniform 0;
valueFraction uniform 0.3;
}
outlet
{
type fixedValue;
value uniform 260;
}
walls
{
type zeroGradient;
}
}
Can anyone please check if this boundary conditions are correct (atmosperic pressure inlet and 300 Pa outlet).
Any comments on if the mach cones will be visible with simpleFoam or rhoSimpleFoam?
Thank you |
