[nuzzknacker]

Hey everyone,

I'm pretty new to openFOAM and CFD in general and therefore some things still confuse me a lot.

I have an issue with a simulation of a stirred water vessel with an air-water interface. It works when I have an initial timestep of 1e-4 and higher in my controlDict but when I set deltaT to anything lower than this (e.g. 1e-5) I get a floating point exception more or less right away.

My simulation setup is far from ideal since also with a timestep of 1e-4 I get a floating point exception after simulating around 1.6 seconds. But still, it confuses me a lot that it basically doesn't work at all when lowering the time step.

If anybody has experienced something similar or has an idea what the issue could be it would be highly appreciated.

I attached my case and the logs for deltaT 1e-5 and here is the error message I get after two time steps:

#0 Foam::error:rintStack(Foam::Ostream&) at ??:?
#1 Foam::sigFpe::sigHandler(int) at ??:?
#2 ? in "/lib/x86_64-linux-gnu/libc.so.6"
#3 ? in "/lib/x86_64-linux-gnu/libm.so.6"
#4 powf64 in "/lib/x86_64-linux-gnu/libm.so.6"
#5 Foam:ow(Foam::Field<double>&, Foam::UList<double> const&, double const&) at ??:?
#6 Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam:ow<Foam::fvPatchField, Foam::volMesh>(Foam::tmp<Foam::GeometricField<doub le, Foam::fvPatchField, Foam::volMesh> > const&, Foam::dimensioned<double> const&) at ??:?
#7 Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam:ow<Foam::fvPatchField, Foam::volMesh>(Foam::tmp<Foam::GeometricField<doub le, Foam::fvPatchField, Foam::volMesh> > const&, double const&) at ??:?
#8 Foam::diameterModels::isothermal::correct() at ??:?
#9 Foam:haseSystem::correct() at ??:?
#10 Foam::PhaseTransferPhaseSystem<Foam::OneResistance HeatTransferPhaseSystem<Foam::MomentumTransferPhas eSystem<Foam:haseSystem> > >::correct() at ??:?
#11 Foam::solvers::multiphaseEuler:rePredictor() at ??:?
#12 ? in "/opt/openfoam11/platforms/linux64GccDPInt32Opt/bin/foamRun"
#13 ? in "/lib/x86_64-linux-gnu/libc.so.6"
#14 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#15 ? in "/opt/openfoam11/platforms/linux64GccDPInt32Opt/bin/foamRun"
Floating point exception

log.1e-5.txt