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Simple foam error

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Old   January 21, 2016, 12:56
Exclamation Simple foam error
  #1
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Mohsen
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Hi guys,
i tried to run a simulation with simpleFoam , but during the solving process i got this Message in time step 40!
it's a flow in a square tube and flow is laminar !
what does it mean and what's wrong with my case?
Thank you all
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
Time = 40

smoothSolver: Solving for Ux, Initial residual = 0.417106, Final residual = 1.2061e+06, No Iterations 1000
smoothSolver: Solving for Uy, Initial residual = 0.385396, Final residual = 1.39355e+06, No Iterations 1000
smoothSolver: Solving for Uz, Initial residual = 0.307868, Final residual = 2.21838e+07, No Iterations 1000
#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 ??:?
Floating point exception (core dumped)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~
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Old   January 22, 2016, 05:35
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Nima Samkhaniani
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Dear Mohsen

number of iteration is around 1000, final residual is around 1E+6, so your problem is diverging.
1- check your BC
2- check initial condition
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