[khatereh]

Hi foamers,
i started working on the flow past of the cylinder in duct,but i have a problem to use pimpleDymfoam in my case, the cylinder move in the y direction with a fixed rate as 0.1m/s.
i used pointmotionuy in 0 document and dynamicMotionSolverFvMesh in constant doc,

motionSolverLibs ( "libfvMotionSolvers.so" );

solver velocityComponentLaplacian;

velocityComponentLaplacianCoeffs
{
component y;
diffusivity directional (1000 1 0);
}
after running.it start to solve the case,but in time=0.84 it stop
the courant number is very high in this time!!!
error:
Courant Number mean: 8.746e+09 max: 4.19433e+17
Time = 0.8454

DICPCG: Solving for cellMotionUy, Initial residual = 1.59842e-05, Final residual = 9.87955e-09, No Iterations 80
DICPCG: Solving for pcorr, Initial residual = 1, Final residual = 0.0196549, No Iterations 32
time step continuity errors : sum local = 131631, global = 906.913, cumulative = -56381.3
PIMPLE: iteration 1
#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::Field<Foam::Tensor<double> >:perator/=(Foam::UList<double> const&) at ??:?
#4 Foam::fv::gaussGrad<Foam::Vector<double> >::gradf(Foam::GeometricField<Foam::Vector<double> , Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::word const&) at ??:?
#5 Foam::fv::gaussGrad<Foam::Vector<double> >::calcGrad(Foam::GeometricField<Foam::Vector<doub le>, Foam::fvPatchField, Foam::volMesh> const&, Foam::word const&) const at ??:?
#6 Foam::fv::gradScheme<Foam::Vector<double> >::grad(Foam::GeometricField<Foam::Vector<double >, Foam::fvPatchField, Foam::volMesh> const&, Foam::word const&) const at ??:?
#7 Foam::tmp<Foam::GeometricField<Foam:uterProduct< Foam::Vector<double>, Foam::Vector<double> >::type, Foam::fvPatchField, Foam::volMesh> > Foam::fvc::grad<Foam::Vector<double> >(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::word const&) at ??:?
#8 Foam::tmp<Foam::GeometricField<Foam:uterProduct< Foam::Vector<double>, Foam::Vector<double> >::type, Foam::fvPatchField, Foam::volMesh> > Foam::fvc::grad<Foam::Vector<double> >(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&) at ??:?
#9 Foam::incompressible::laminar::divDevReff(Foam::Ge ometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh>&) const at ??:?
#10
at ??:?
#11 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#12
at ??:?
Floating point exception (core dumped)
what should i do?
thank u

[avd28]

Start systematically.

1. Run checkMesh. Are all your cells fine?
2. Take a look at your p and U solver in fvschemes dict, try out different options.
3.Take a look at your cell sizes and your local velocities. Unless you are dealing with very small geometries, Co issue is usually tied to improper boundary conditions
4. Check your boundary conditions. Are they stable?