# SonicFoam forwardStepTutorial doesnbt complete the run

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 June 10, 2007, 14:44 Description: The forwardStep t #1 Senior Member   Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,894 Rep Power: 26 Description: The forwardStep tutorial of sonicFoam doesn't complete the simulation and aborts with the error: Courant Number mean: -8.55342e+25 max: 1.66084e+28 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 #0 Foam::error::printStack(Foam:stream&) #1 Foam::sigFpe::sigFpeHandler(int) #2 Uninterpreted: [0xffffe420] #3 Foam::DILUPreconditioner::DILUPreconditioner(Foam: :lduMatrix::solver const&, Foam::Istream&) #4 Foam::lduMatrix::preconditioner::addasymMatrixCons tructorToTable::New(Foam::lduMatrix::solver const&, Foam::Istream&) #5 Foam::lduMatrix::preconditioner::New(Foam::lduMatr ix::solver const&, Foam::Istream&) #6 Foam::PBiCG::solve(Foam::Field&, Foam::Field const&, unsigned char) const #7 Foam::fvMatrix >::solve(Foam::Istream&) #8 Foam::lduMatrix::solverPerformance Foam::solve >(Foam::tmp > > const&) #9 main #10 __libc_start_main #11 __gxx_personality_v0 at ../sysdeps/i386/elf/start.S:122 Increasing the time step to 0.003s circumvents the problem. Solver/Application: sonicFoam Source file: Testcase: forwardStep tutorial for sonicFoam Platform: All Version: 1.4 Notes: The issue was found by Florian Fruth. See http://www.cfd-online.com/cgi-bin/Op...how.cgi?1/4657 Regards, Alberto __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as live DVD/USB, hard drive image and virtual image. OpenQBMM - An open-source implementation of quadrature-based moment methods

 June 10, 2007, 15:35 As suggested by Hrvoje, the so #2 Senior Member   Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,894 Rep Power: 26 As suggested by Hrvoje, the solution consists in setting the outlet BC to zeroGradient for T and U. I attach the corrected tutorial case. forwardStep.zip Regards, A. __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as live DVD/USB, hard drive image and virtual image. OpenQBMM - An open-source implementation of quadrature-based moment methods

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