[quwsk]

I'm very new to OpenFOAM, and not familiar with the BC of OpenFOAM.
I am doing a simulation with a pipe flow with Stagnation inlet and Pressure outlet. But it diverges with the setting below, which part did I do wrong?
And anyone help me please.


/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 5 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform 101.629889;

boundaryField
{

inlet
{
type totalPressure;
p0 uniform 97.5;
value uniform 97.5;
}


outlet
{
type totalPressure;
p0 uniform 0;
value uniform 0;
}

wall
{
type zeroGradient;
}

}

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



/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 5 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform (0 0 0);

boundaryField
{

inlet
{
type pressureInletVelocity;
value $internalField;
}

outlet
{
type pressureInletOutletVelocity;
tangentialVelocity $internalField;
value $internalField;
}


wall
{
type noSlip;
}

}

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

[unilord]

Originally Posted by quwsk

I'm very new to OpenFOAM, and not familiar with the BC of OpenFOAM.
I am doing a simulation with a pipe flow with Stagnation inlet and Pressure outlet. But it diverges with the setting below, which part did I do wrong?
And anyone help me please.


/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 5 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform 101.629889;

boundaryField
{

inlet
{
type totalPressure;
p0 uniform 97.5;
value uniform 97.5;
}


outlet
{
type totalPressure;
p0 uniform 0;
value uniform 0;
}

wall
{
type zeroGradient;
}

}

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



/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 5 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform (0 0 0);

boundaryField
{

inlet
{
type pressureInletVelocity;
value $internalField;
}

outlet
{
type pressureInletOutletVelocity;
tangentialVelocity $internalField;
value $internalField;
}


wall
{
type noSlip;
}

}

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

You can not define total pressure both at inlet and outlet. Try total pressure at inlet and static pressure at outlet.

Furthermore, can I ask why not use the typical flow rate inlet and pressure outlet or vice versa?

[quwsk]

Originally Posted by unilord

You can not define total pressure both at inlet and outlet. Try total pressure at inlet and static pressure at outlet.

Furthermore, can I ask why not use the typical flow rate inlet and pressure outlet or vice versa?

I assumed the pipe would be the wind tunnel for the fan. Which the massflow or velocity is unknown.

And I am more familiar with starccm+ and Fluent, which is set as Pressure inlet and Pressure outlet. Therefore I would like to know how to use Pressure inlet and outlet in OpenFOAM.

[quwsk]

And sorry, does static pressure means

type fixedValue;
value $internalField;

correct be if I am wrong