# Time step continuity errors

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 April 4, 2013, 05:53 Time step continuity errors #1 New Member   Alex Flaminio Join Date: Feb 2013 Posts: 3 Rep Power: 6 Hello everyone, I'm currently trying to run sonicFoam but I get the following error, does anyone have an idea about what could be the source of this problem? Thanks! Starting time loop Time = 1e-08 Courant Number mean: 0.00176125 max: 0.0405339 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 7.76785e-17, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 9.40551e-11, No Iterations 2 DILUPBiCG: Solving for e, Initial residual = 1, Final residual = 1.48183e-10, No Iterations 2 DILUPBiCG: Solving for p, Initial residual = 1, Final residual = 1.83804e-16, No Iterations 4 DILUPBiCG: Solving for p, Initial residual = 0.00157704, Final residual = 1.98549e-14, No Iterations 3 DILUPBiCG: Solving for p, Initial residual = 2.68957e-05, Final residual = 6.00475e-13, No Iterations 2 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 time step continuity errors : sum local = 1.03078e-16, global = -1.2921e-17, cumulative = -1.2921e-17 DILUPBiCG: Solving for p, Initial residual = 0.00126998, Final residual = 5.04877e-15, No Iterations 3 DILUPBiCG: Solving for p, Initial residual = 1.58899e-05, Final residual = 2.60516e-13, No Iterations 2 DILUPBiCG: Solving for p, Initial residual = 3.59162e-07, Final residual = 5.96198e-15, No Iterations 2 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 time step continuity errors : sum local = 9.92037e-17, global = -1.59358e-17, cumulative = -2.88568e-17 #0 Foam::error:rintStack(Foam::Ostream&) at ??:? #1 Foam::sigFpe::sigHandler(int) at ??:? #2 Uninterpreted: #3 Foam::divide(Foam::Field&, Foam::UList const&, Foam::UList const&) at ??:? #4 void Foam::divide(Foam::GeometricField&, Foam::GeometricField const&, Foam::GeometricField const&) at ??:? #5 Foam::tmp > Foam:perator/(Foam::tmp > const&, Foam::GeometricField const&) at ??:? #6 Foam::compressible::RASModels::SpalartAllmaras::ch i() const at ??:? #7 Foam::compressible::RASModels::SpalartAllmaras::co rrect() at ??:? #8 at ??:? #9 __libc_start_main in "/lib/i386-linux-gnu/libc.so.6" #10 at ??:?

 April 4, 2013, 07:23 #2 New Member   Eric Join Date: Mar 2013 Posts: 22 Rep Power: 6 It looks to me like div by zero in the turbulence model. Maybe try to change relaxation factors. So far I've never used a transient solver in OpenFOAM but Initial residual 0 for rho looks confusing to me.

 June 26, 2013, 09:05 #3 New Member   Giovani Diniz Join Date: Jun 2013 Location: Boston Posts: 13 Rep Power: 6 am9109, I've been trying to setup a propeller in OF using pimpleDyMFoam and I faced the same error message you did. What I had to do to was to adjust the initial deltaT in my controlDict and allow the solver to adjust it to control the Courant number using "adjustTimeStep yes". Not sure if it will help, but it might be worthing to give it a shot. Hope it helps. Cheers! -- Giovani

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