[Sakun]

Originally Posted by calim_cfd

hi
pressureinletoutletvelocity (in) bcs are to be used with inletoutlet (out) bcs for the u field

and you use totalpressure(in) and fixedvalue(out) for the p field

these bcs guarantee a well-posed problem in case the user has only pressure measures and backflow expected

try that
l8r and gl

Hi ,


Sorry for messeging to an old thread

i am simulating a compressor blade and i need to required apply total pressure,static pressure for "p" and total temperature for "T" .

my simulation shows a tendency to converge but after around 2000 iterations it diverges.
i attached p ,U codes and BC values, i would really appriciate if you could comment on them whether it is correct or wrong. i need desperately need help.


p file,

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2112                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //


dimensions      [1 -1 -2 0 0 0 0];

internalField   uniform 97251;

boundaryField
{
    INLET
    {
        //type            freestreamPressure;
        //freestreamValue uniform $pOut;

        type            totalPressure;
        p0                uniform 115775;
        value           uniform 115775;
    
        //type            fixedValue;
        //value           uniform 84636.34;
    }

    OUTLET
    {
         //type            freestreamPressure;
        //freestreamValue $internalField;    
            
        type            fixedValue;
        value           uniform 97251;
    }

    CASCADE
    {
        type            zeroGradient;
    }

    "(TOP|BOTTOM)"
    {
        type            cyclicAMI;
    }

    frontAndBackPlanes
    {
        type            empty;
    }
}


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

U file,

/*--------------------------------*- C++ -*----------------------------------* \
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2112                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     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            pressureInletOutletVelocity;
        //value           uniform $Uinlet;

        //type            freestreamVelocity;
        //freestreamValue uniform $Uinlet;
        //value           uniform $Uinlet;
    
        //type            fixedValue;
        //value           uniform (232.43 20.34 0);
        
        type pressureDirectedInletVelocity;
        inletDirection uniform (0.631623456 -0.775275312 0);
        value uniform (0 0 0);
    }

    OUTLET
    {
    
        /*
        type            pressureDirectedInletOutletVelocity;
        phi             phi;
        rho             rho;
        inletDirection  uniform (0.631623456 -0.775275312 0);
        value           uniform 0;
        */
        
        //type           inletOutlet;
        //inletValue    uniform (0 0 0);
        //value         $internalField;

        //type            zeroGradient;
    }

    CASCADE
    {
        type            noSlip;
    }
    
    "(TOP|BOTTOM)"
    {
        type            cyclicAMI;
    }

    frontAndBackPlanes
    {
        type            empty;
    }

    
}


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