[Eko]

Hey guys

I'm currently working on a convection case using the chtMultiRegionFoam solver. Well the case is running with fixed temperature and velocity U=0.
When I change boundary conditions for T and U it's running but the temperature gets negative (it shouldn't do that) and it aborts later on.
The problem is the U file I guess. T seems to work with U=0 but I don't know why it doesn't work with U=5 (even not with U=0,5).
Do you have any suggestions on how to solve this issue?
If you need more information/input let me know and thanks in advance


T

dimensions      [ 0 0 0 1 0 0 0 ];

internalField   uniform 291.5;

boundaryField
{
    inlet
    {
        type            uniformFixedValue;
        uniformValue    table ( ( 0 291.95 ) ( 3600 290.35 ) ( 7200 290.15 ) ( 10800 289.35 ) ( 14400 288.15 ) ( 18000 287.95 ) ( 21600 289.65 ) ( 25200 293.15 ) ( 28800 297.25 ) ( 32400 301.35 ) ( 36000 302.95 ) ( 39600 303.65 ) ( 43200 303.55 ) ( 46800 303.85 ) ( 50400 304.15 ) ( 54000 305.25 ) ( 57600 305.65 ) ( 61200 304.75 ) ( 64800 304.15 ) ( 68400 303.25 ) ( 72000 300.55 ) ( 75600 299.25 ) ( 79200 298.05 ) ( 82800 296.05 ) ( 86400 294.85 ) );
        value           uniform 291.95;
    }
    outlet
    {
        type            inletOutlet;
        inletValue      $internalField;
        value           $internalField;
    }
    floor
    {
        type            fixedValue;
        value           $internalField;
    }
    ceiling
    {
        type            zeroGradient;
    }
    frontAndBack
    {
        type            zeroGradient;
    }
    Umgebung_to_B1600-12
    {
        type            compressible::turbulentTemperatureCoupledBaffleMixed;
        value           uniform 291.5;
        Tnbr            T;
        kappaMethod     fluidThermo;
    }
    Umgebung_to_Air
    {
        type            compressible::turbulentTemperatureCoupledBaffleMixed;
        value           uniform 291.5;
        Tnbr            T;
        kappaMethod     fluidThermo;
    }
}

U

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

internalField   uniform ( 5 0 0 );

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform ( 5 0 0 );
    }
    outlet
    {
        type            inletOutlet;
        inletValue      uniform ( 0 0 0 );
        value           uniform ( 5 0 0 );
    }
    floor
    {
        type            noSlip;
    }
    ceiling
    {
        type            fixedValue;
        value           uniform ( 0 0 0 );
    }
    frontAndBack
    {
        type            fixedValue;
        value           uniform ( 0 0 0 );
    }
    Umgebung_to_B1600-12
    {
        type            noSlip;
        value           uniform ( 0 0 0 );
    }
    Umgebung_to_Air
    {
        type            noSlip;
        value           uniform ( 0 0 0 );
    }
}

Works fine with files below

dimensions      [ 0 0 0 1 0 0 0 ];

internalField   uniform 299;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }
    outlet
    {
        type            zeroGradient;
    }
    floor
    {
        type            zeroGradient;
    }
    ceiling
    {
        type            zeroGradient;
    }
    frontAndBack
    {
        type            zeroGradient;
    }
    Umgebung_to_B1600-12
    {
        type            compressible::turbulentTemperatureCoupledBaffleMixed;
        value           uniform 299;
        Tnbr            T;
        kappaMethod     fluidThermo;
    }
    Umgebung_to_Air
    {
        type            compressible::turbulentTemperatureCoupledBaffleMixed;
        value           uniform 299;
        Tnbr            T;
        kappaMethod     fluidThermo;
    }
}

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

internalField   uniform ( 0.01 0 0 );

boundaryField
{
    inlet
    {
        type            noSlip;
    }
    outlet
    {
        type            noSlip;
    }
    floor
    {
        type            noSlip;
    }
    ceiling
    {
        type            noSlip;
    }
    frontAndBack
    {
        type            noSlip;
    }
    Umgebung_to_B1600-12
    {
        type            noSlip;
        value           uniform ( 0 0 0 );
    }
    Umgebung_to_Air
    {
        type            noSlip;
        value           uniform ( 0 0 0 );
    }
}

[Eko]

Maybe to add a little bit more information. This is the error message I get.

[7] #0  Foam::error::printStack(Foam::Ostream&) at ??:?
[7] #1  Foam::sigFpe::sigHandler(int) at ??:?
[7] #2  ? in "/lib/x86_64-linux-gnu/libc.so.6"
[7] #3  Foam::GAMGSolver::scale(Foam::Field<double>&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> cons$
[7] #4  Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMatrix::smoother> const&, Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&$
[7] #5  Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
[7] #6  Foam::fvMatrix<double>::solveSegregated(Foam::dictionary const&) at ??:?
[7] #7  Foam::fvMatrix<double>::solve(Foam::dictionary const&) at ??:?
[7] #8  ? at ??:?
[7] #9  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
[7] #10  ? at ??:?
[cfdserver:14248] *** Process received signal ***
[cfdserver:14248] Signal: Floating point exception (8)
[cfdserver:14248] Signal code:  (-6)
[cfdserver:14248] Failing at address: 0x3ec000037a8
[cfdserver:14248] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x354b0)[0x7f26a0c104b0]
[cfdserver:14248] [ 1] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x38)[0x7f26a0c10428]
[cfdserver:14248] [ 2] /lib/x86_64-linux-gnu/libc.so.6(+0x354b0)[0x7f26a0c104b0]
[cfdserver:14248] [ 3] /opt/openfoam5/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so(_ZNK4Foam10GAMGSolver5scaleERNS_5FieldIdEES3_RKNS_9lduMatrixERKNS_10FieldFieldIS1_dEERKNS_8UPtrListIKNS_17ld$
[cfdserver:14248] [ 4] /opt/openfoam5/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so(_ZNK4Foam10GAMGSolver6VcycleERKNS_7PtrListINS_9lduMatrix8smootherEEERNS_5FieldIdEERKS8_S9_S9_S9_S9_S9_RNS1_I$
[cfdserver:14248] [ 5] /opt/openfoam5/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so(_ZNK4Foam10GAMGSolver5solveERNS_5FieldIdEERKS2_h+0x807)[0x7f26a1f14987]
[cfdserver:14248] [ 6] /opt/openfoam5/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so(_ZN4Foam8fvMatrixIdE15solveSegregatedERKNS_10dictionaryE+0x15b)[0x7f26a40c1bfb]
[cfdserver:14248] [ 7] chtMultiRegionFoam(_ZN4Foam8fvMatrixIdE5solveERKNS_10dictionaryE+0x191)[0x4caf41]
[cfdserver:14248] [ 8] chtMultiRegionFoam[0x442253]
[cfdserver:14248] [ 9] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f26a0bfb830]
[cfdserver:14248] [10] chtMultiRegionFoam[0x447d99]
[cfdserver:14248] *** End of error message ***
--------------------------------------------------------------------------
mpirun noticed that process rank 7 with PID 14248 on node cfdserver exited on signal 8 (Floating point exception).