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turbulence model convergence problem

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Old   August 23, 2017, 17:39
Default turbulence model convergence problem
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John J. Bazaar
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I am running simpleFoam on a turbulent model with k-epsilon method and am getting the following messages and I can't figure out what it's telling me.

linux@linux-Precision-T7600:~/OpenFOAM/linux-4.0/run/Bazaar/Turbulent/Incompressible/genericCylinderFine$ #0 Foam::error:rintStack(Foam::Ostream&) at ??:?
#1 Foam::sigFpe::sigHandler(int) at ??:?
#2 ? in "/lib/x86_64-linux-gnu/libc.so.6"
#3 Foam::GAMGSolver::scale(Foam::Field<double>&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const at ??:?
#4 Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMa trix::smoother> const&, Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const at ??:?
#5 Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
#6 Foam::fvMatrix<double>::solveSegregated(Foam::dict ionary const&) at ??:?
#7 Foam::fvMatrix<double>::solve(Foam::dictionary const&) at ??:?
#8 Foam::fvMatrix<double>::solve() at ??:?
#9 ? at ??:?
#10 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#11 ? at ??:?

I've attached a picture of the convergence plots.

thanks.
Attached Images
File Type: jpg Screenshot from 2017-08-23 13-35-42.jpg (47.3 KB, 17 views)

Last edited by jjbazaar; August 28, 2017 at 15:30. Reason: additional explanation of the problem
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Old   August 28, 2017, 15:44
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John J. Bazaar
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Quote:
Originally Posted by jjbazaar View Post
I am running simpleFoam on a turbulent model with k-epsilon method and am getting the following messages and I can't figure out what it's telling me.

linux@linux-Precision-T7600:~/OpenFOAM/linux-4.0/run/Bazaar/Turbulent/Incompressible/genericCylinderFine$ #0 Foam::error:rintStack(Foam::Ostream&) at ??:?
#1 Foam::sigFpe::sigHandler(int) at ??:?
#2 ? in "/lib/x86_64-linux-gnu/libc.so.6"
#3 Foam::GAMGSolver::scale(Foam::Field<double>&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const at ??:?
#4 Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMa trix::smoother> const&, Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const at ??:?
#5 Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
#6 Foam::fvMatrix<double>::solveSegregated(Foam::dict ionary const&) at ??:?
#7 Foam::fvMatrix<double>::solve(Foam::dictionary const&) at ??:?
#8 Foam::fvMatrix<double>::solve() at ??:?
#9 ? at ??:?
#10 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#11 ? at ??:?

I've attached a picture of the convergence plots.

thanks.
I'm not sure if I have a mesh problem or if my convergence settings are too restrictive.
what surprised me was that the convergence was proceeding smoothly until it suddenly diverged within a few cycles.

Linux Ubuntu 16.04
OpenFOAM 4.1
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