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externalCoupledTemperature for incompressible?

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Old   September 30, 2020, 14:07
Smile externalCoupledTemperature for incompressible?
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sibo
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Hi Foamers,

There is an boundary condition called externalCoupledTemperature which is used to couple OF solves to other CFD codes. However, it can only be used in compressible solver for now. The reason can be found in the following code. Basically, this BC needs 'he' and 'alpha', which can only be accessed in thermo class in compressible solvers. Since the incompressible solvers solve temperature separately from P/U, it only has this transport class.

Code:
if (db().foundObject<cmpTurbModelType>(turbName))
    {
        const cmpTurbModelType& turbModel =
            db().lookupObject<cmpTurbModelType>(turbName);

        const basicThermo& thermo = turbModel.transport();

        const fvPatchScalarField& hep = thermo.he().boundaryField()[patchi];

        qDot = turbModel.alphaEff(patchi)*hep.snGrad();
    }
    else if (db().foundObject<basicThermo>(thermoName))
    {
        const basicThermo& thermo = db().lookupObject<basicThermo>(thermoName);

        const fvPatchScalarField& hep = thermo.he().boundaryField()[patchi];

        qDot = thermo.alpha().boundaryField()[patchi]*hep.snGrad();
    }
    else
    {
        FatalErrorInFunction
            << "Condition requires either compressible turbulence and/or "
            << "thermo model to be available" << exit(FatalError);
    }if (db().foundObject<cmpTurbModelType>(turbName))
    {
        const cmpTurbModelType& turbModel =
            db().lookupObject<cmpTurbModelType>(turbName);

        const basicThermo& thermo = turbModel.transport();

        const fvPatchScalarField& hep = thermo.he().boundaryField()[patchi];

        qDot = turbModel.alphaEff(patchi)*hep.snGrad();
    }
    else if (db().foundObject<basicThermo>(thermoName))
    {
        const basicThermo& thermo = db().lookupObject<basicThermo>(thermoName);

        const fvPatchScalarField& hep = thermo.he().boundaryField()[patchi];

        qDot = thermo.alpha().boundaryField()[patchi]*hep.snGrad();
    }
    else
    {
        FatalErrorInFunction
            << "Condition requires either compressible turbulence and/or "
            << "thermo model to be available" << exit(FatalError);
    }
Now I need to use it in incompressible solvers, I want to modify this boundary condition. But I'm not sure how to give it the 'he' and 'alpha' in an incompressible solver.

Any suggestion is welcome. Thanks in advance!
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Old   October 3, 2020, 11:32
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Michael Alletto
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Did you try to use a compressible solver but choosing a constant density and in the thermodynamic package. See https://cfd.direct/openfoam/user-gui...hermophysical/
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