[Alexesp811]

I need help, Im new in OpenFoam and I have been trying to set up different simulations in OpenFoam for a HVAC study in a room with a hot cylinder inside, the problem is that i´ve used buoyantboussinesqsimplefoam and the residuals of pressure do not converge. Doing the same and setting up the simulation with almost the same mesh and the same options for air and other boundary conditions but this time in fluent it works fine and converges. Solutions have big differences from one software to other and i dont know what im doing wrong.

Here I post the different velocity and temperature profile and also the boundary conditions for velocity and pressure.

object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform (0 0 0);

boundaryField
{
inlet
{
type fixedValue;
value uniform (0.1 0 0);
}

outlet
{
type inletOutlet;
inletValue uniform (0 0 0);
value uniform (0 0 0);
}

walls
{
type noSlip;
}

walls2
{
type noSlip;
}
}


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

object p_rgh;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform 0;

boundaryField
{
inlet
{
type zeroGradient;
}

outlet
{
type fixedValue;
value uniform 0;
}

walls
{
type zeroGradient;
}

walls2
{
type zeroGradient;
}
}

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


I also upload some picture of the solutions.

U openfoam.png

U fluent.png

T Openfoam.png

T FLUENT.png