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Calculating the Convective Heat Transfer Coefficient for incompressible fluide

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Old   August 26, 2024, 10:41
Default Calculating the Convective Heat Transfer Coefficient for incompressible fluide
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Fadi M. Bourarach
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Hello Foamer,

I am relatively new to openfoam.
I want to extract the convective heat transfer coefficient (CHTC) and I am facing some issues.

This is my setup:
- Geometry : searchableRotatedBox (named panel)
- Solver : buoyantBoussinesqSimpleFoam
- Meshing : SnappyHexMesh (with layers and refinement regions)
- fluide : Incompressible
- RAS : kOmegaSST
- transportModel : Newtonian

1. direct : using "heatTransferCoeff":

Code:
heatTransferCoeff1
{
    // Mandatory entries (unmodifiable)
    type            heatTransferCoeff;
    libs            (fieldFunctionObjects);

    // heatTransferCoeff;
    // Nu    : Nusselt number
    // L     : Characteristic length that defines the scale of the physical system
    // kappa : Thermal conductivity of the fluid
    field           chtc_0;

    patches         (panel);
    htcModel        ReynoldsAnalogy; // options: ReynoldsAnalogy; localReferenceTemperature; fixedReferenceTemperature
    UInf            (20 0 0);
    Cp              CpInf;
    CpInf           1000;
    rho             rhoInf;
    rhoInf          1.2;

    // Optional (inherited) entries
    result          chtc_0;
    region          region0;
    enabled         true;
    log             true;
    timeStart       0;
    timeEnd         5000;
    executeControl  timeStep;
    executeInterval 1;
    writeControl    timeStep;
    writeInterval   1;
}
The error I get:
Code:
--> FOAM FATAL ERROR:
Unable to find a valid thermo model to evaluate q
2. Indirect : wallHeatFlux

Code:
wallHeatFlux1
{
    // Mandatory entries (unmodifiable)
    type            wallHeatFlux;
    libs            (fieldFunctionObjects);

    // Optional entries (runtime modifiable)
    patches     (panel);
    qr          qr;
}
The error I get:
Code:
--> FOAM FATAL ERROR: 
Unable to find compressible turbulence model in the database
Apparently I can't use it for incompressible flow (wallHeatFlux utility for an incompressible case)

Can you help me please ?

Thank you for you time !

Cheers,
Fadi
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