Backward Facing Step on buoyantSimpleFoam
 

Hi I m trying to run the BFS problem with air on OpenFOAM.
I already managed to run it on SimpleFoam but now I want to add heat transfert to my case so I want to use buoyantSimpleFoam.
My problem is when I run it (laminar case without buoyancy g=0 and even cold flow) the pressure is constant and equal to 1e5 Pa everywhere.
I Think it could be because of my initial conditions on p which are:
dimensions [1 -1 -2 0 0 0 0];

internalField uniform 1.1e5;

boundaryField
{
inlet
{
type zeroGradient;
}
outlet
{
type fixedValue;
value uniform 1.1e5;
}
upperWall
{
type buoyantPressure;
}
lowerWall
{
type buoyantPressure;
}
temperatureWall
{
type buoyantPressure;
}
frontAndBack
{
type empty;
}
}

Or

internalField uniform 1e5;

boundaryField
{
inlet
{
type zeroGradient;
}
outlet
{
type zeroGradient;
}
upperWall
{
type zeroGradient;
}
lowerWall
{
type zeroGradient;
}
temperatureWall
{
type zeroGradient;
}
frontAndBack
{
type empty;
}
}


Or

internalField uniform 1e5;

boundaryField
{
inlet
{
type zeroGradient;
}
outlet
{
type fixedValue;
value uniform 1.1e5;
}
upperWall
{
type zeroGradient;
}
lowerWall
{
type zeroGradient;
}
temperatureWall
{
type zeroGradient;
}
frontAndBack
{
type empty;
}
}

Can someone help me please I m pretty new on openFoam,
Thx.