[camoesas]

Good Evening Everybody,

I am trying to simulate the flow over a hot board to investigate the boundary layer of velocity and temperature. I have already done a simulation with rhoSimpleFoam. Now I want to start a simultion with buoyantSimpleFoam. I´ve made the setup and OpenFoam told me to initialize with potentialFoam. I´ve initialized with my rhoSimpleFoam solution.

Now the simulation starts but then it aborts after few iterations giving me this strange error massage:

#0  Foam::error::printStack(Foam::Ostream&) in "/home/camoesas/OpenFOAM/OpenFOAM-2.0.0/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#1  Foam::sigFpe::sigHandler(int) in "/home/camoesas/OpenFOAM/OpenFOAM-2.0.0/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2   in "/lib64/libc.so.6"
#3  Foam::GAMGSolver::scalingFactor(Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double> const&, Foam::Field<double> const&) const in "/home/camoesas/OpenFOAM/OpenFOAM-2.0.0/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#4  Foam::GAMGSolver::scalingFactor(Foam::Field<double>&, Foam::lduMatrix const&, Foam::Field<double>&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const in "/home/camoesas/OpenFOAM/OpenFOAM-2.0.0/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#5  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>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const in "/home/camoesas/OpenFOAM/OpenFOAM-2.0.0/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#6  Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/home/camoesas/OpenFOAM/OpenFOAM-2.0.0/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#7  Foam::fvMatrix<double>::solve(Foam::dictionary const&) in "/home/camoesas/OpenFOAM/OpenFOAM-2.0.0/platforms/linux64GccDPOpt/lib/libfiniteVolume.so"
#8  Foam::fvMatrix<double>::solve() in "/home/camoesas/OpenFOAM/OpenFOAM-2.0.0/platforms/linux64GccDPOpt/bin/buoyantSimpleFoam"
#9  
 in "/home/camoesas/OpenFOAM/OpenFOAM-2.0.0/platforms/linux64GccDPOpt/bin/buoyantSimpleFoam"
#10  __libc_start_main in "/lib64/libc.so.6"
#11  
 at /usr/src/packages/BUILD/glibc-2.11.3/csu/../sysdeps/x86_64/elf/start.S:116

I don´t have any clue to interpret this message! What could it mean? Why is my solver aborting?

thanks

[nimasam]

try this in your fvSolution for p, pFinal or p_rgh

{
solver PCG;
preconditioner DIC;
tolerance 1e-10;
relTol 0;
}
maybe cure your problem

[camoesas]

HI Nima,

thanks for the hint. But it just makes my solver slower and its still aborting at the same step.
As one can see the residuals are exploding.

[camoesas]

I´ve got it running but in the end I don´t know what exactly was the important change. Therefore I am uploading the whole case as example and inspiration for everybody who is struggling with buoyantSimpleFoam.

[camoesas]

attached file: