# time step continuity errors??

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 June 23, 2009, 23:48 time step continuity errors?? #1 New Member   CFT Join Date: Mar 2009 Posts: 15 Rep Power: 8 Dear all I am running a simulation of a building using the k epsilon rng model. However on running the first time step I get a "time step continuity error" Does anyone know what the problem is. thanks CFT The error message is as follows Starting time loop Time = 1.01 DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 0.00508, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 0.00557, No Iterations 1 DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 0.00508, No Iterations 1 DICPCG: Solving for p, Initial residual = 1, Final residual = 0.00923, No Iterations 298 time step continuity errors : sum local = 3.61e-05, global = 1.98e-07, cumulative = 1.98e-07 #0 Foam::error:rintStack(Foam::Ostream&) in "/home/steven/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so" #1 Foam::sigFpe::sigFpeHandler(int) in "/home/st/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so" #2 Uninterpreted: [0xffffe400] #3 Foam::divide(Foam::Field&, Foam::UList const&, Foam::UList const&) in "/home/st/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so" #4 void Foam::divide(Foam::GeometricField&, Foam::GeometricField const&, Foam::GeometricField const&) in "/home/st/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libincompressibleRASModels.so" #5 Foam::tmp > Foam:perator/(Foam::tmp > const&, Foam::GeometricField const&) in "/home/st/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libincompressibleRASModels.so" #6 Foam::incompressible::RASModels::RNGkEpsilon::corr ect() in "/home/st/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libincompressibleRASModels.so" #7 main in "/home/st/OpenFOAM/OpenFOAM-1.5/applications/bin/linuxGccDPOpt/simpleFoam" #8 __libc_start_main in "/lib/libc.so.6" #9 Foam::regIOobject::readIfModified() in "/home/st/OpenFOAM/OpenFOAM-1.5/applications/bin/linuxGccDPOpt/simpleFoam" Floating point exception

 June 24, 2009, 09:01 #2 Senior Member   Rishi . Join Date: Mar 2009 Posts: 140 Rep Power: 8 Hi, I guess it might be a problem of Initial/Boundary condition. Check if you have initalised everything correctly? Seems like a division by ZERO problem.( maybe Pressure?) Are you starting simulation from timestep 1.00?

 June 26, 2009, 09:29 #3 Senior Member   Wolfgang Heydlauff Join Date: Mar 2009 Location: Germany Posts: 136 Rep Power: 8 hellorishi is right, i almost always is a BC problem. make sure for the simplefoam you have the fvscheme on stady state, not on euler. make sure you have the turbulence on/off (at beginning sometimes good to have it off) go to a more aggressive divscheme check BC again. U in right direction? initial k or initial epsilon too big?? calculate them in the first place.

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