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Old   November 29, 2016, 10:59
Default URGENT - Simulation setup using Reynolds Tensor Transport (R) - OpenFOAM
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Bernardo Ribeiro
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Hello guys!

I'm currently trying to simulate a LRR and SSG in a flow that is external to a sphere. Both of them, as you guys might now, are types of simulation that use Reynolds Stress Tensor Transport in your bases of calculation.

So, I added a "R" file in my 0/ folder already that comes with my Reynolds Tensor value.

I start the simulation and everything goes fine until around 8 seconds (when I use pimpleFoam) and 3 seconds (when I use pisoFoam). I don't know what it keeps getting wrong because the Courant looks fine, everything looks fine. Suddenly the simulation crashes and this happens:

#0 Foam::error:rintStack(Foam::Ostream&) in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/lib/"
#1 Foam::sigFpe::sigHandler(int) in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/lib/"
#2 ? in "/lib64/"
#3 Foam::symGaussSeidelSmoother::smooth(Foam::word const&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::Field<double> const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, unsigned char, int) in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/lib/"
#4 Foam::symGaussSeidelSmoother::smooth(Foam::Field<d ouble>&, Foam::Field<double> const&, unsigned char, int) const in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/lib/"
#5 Foam::smoothSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/lib/"
#6 Foam::fvMatrix<Foam::SymmTensor<double> >::solveSegregated(Foam::dictionary const&) in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/lib/"
#7 Foam::fvMatrix<Foam::SymmTensor<double> >::solve(Foam::dictionary const&) in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/lib/"
#8 Foam::fvMatrix<Foam::SymmTensor<double> >::solve() in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/lib/"
#9 Foam::RASModels::LRR<Foam::IncompressibleTurbulenc eModel<Foam::transportModel> >::correct() in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/lib/"
#10 ? in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/bin/pisoFoam"
#11 __libc_start_main in "/lib64/"
#12 ? in "/opt/OpenFOAM/OpenFOAM-v1606+/platforms/linux64GccDPInt32Opt/bin/pisoFoam"
Floating point exception

What is this fvMatrix error? I don't get that. I tried many fvSchemes like limitedLinear 1.0, backward, CrankNicolson and nothing works.

Please, I need help with this! Any answer will be great! Thanks in advance!

Bernardo Ribeiro
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Old   December 2, 2016, 07:51
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floating point exception normally happens when you have 0 somewhere in a division. Probable reasons generally are bad mesh or bad boundary conditions.. either of these can lead to very high value of some flow quantity which leads to such error. your solver log (from start) would be more helpful. See for stuff like "bounding k/omega/U etc.."
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