OpenFOAM - error in openfoam

error in openfoam

I was trying to simualte this case in openfoam using icoFoam, whose BCs are these.

and I'm getting this error

Courant Number mean: 53.8675 max: 11997.2
#0 Foam::error::printStack(Foam::Ostream&) at ??:?
#1 Foam::sigFpe::sigHandler(int) at ??:?
#2 ? in "/lib/x86_64-linux-gnu/libc.so.6"
#3 Foam::symGaussSeidelSmoother::smooth(Foam::word const&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::Field<double> const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, unsigned char, int) at ??:?
#4 Foam::symGaussSeidelSmoother::smooth(Foam::Field<double>&, Foam::Field<double> const&, unsigned char, int) const at ??:?
#5 Foam::smoothSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
#6 ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/icoFoam"
#7 ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/icoFoam"
#8 ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/icoFoam"
#9 ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/icoFoam"
#10 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#11 ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/icoFoam"
Floating point exception (core dumped)

Please Help

these are my case files

OpenFOAM 23-07-21, 9:04 a.m. prth_bndl

This question shows research effort; it is useful and clear

This question does not show any research effort; it is not useful and unclear

Hi,
The solver (icoFoam) you are using is transient. So it is necessary to evaluate CFL no and deltaT. If your mesh is unstructured and difficult to calculate CFL no manually, you can set deltaT as adjustable and specify maximum CFL no. It will calculate deltaT at every iteration for max CFL no you are specifying. Have a look at these two lines and modify/edit in your controlDict file:

writeControl adjustableRunTime;
maxCo 1.0;

Regards,
Divyesh Variya

23-07-21, 10:53 a.m. divyesh

Hi I just want to know that how did you figured out the problem from these ten line error, I often get this ten line error many times some times it is related to wrong boundary types and boundary conditions and this time it was CFL no. Is there a documentaion of somekind which help in figuring out the problem, because floating point exception is always common among them.

23-07-21, 7:08 p.m. prth_bndl

You can crack that from the error message itself. For example, in this case, first line says Courant no is 11997... Theoretically, it should be less than 1. So from your courant no formula, you can either fix deltaT or maxCo no or Velocity. Since your velocity is fixed and delltaT can vary based on velocity and cell size you can fix max courant no and OpenFOAM will calculate deltaT automatically.
Regarding documentation on errors, there is no such documentation available but based on your theoretical knowledge and error message you can resolve the issue.

Regards,
Divyesh Variya

25-07-21, 10:19 a.m. divyesh

Keep up the good work; I read few posts on this website, including I consider that your blog is fascinating and has sets of the fantastic piece of information. Thanks for your valuable efforts. surgical face mask

27-09-21, 7:03 p.m. BrianaBalducci

Positive site, where did u come up with the information on this posting?I have read a few of the articles on your website now, and I really like your style. Thanks a million and please keep up the effective work. nearest food

04-10-21, 12:41 p.m. browning

Log-in to answer to this question.