|July 5, 2014, 06:13||
Increasing Square Cavity mesh to 100x100 causes crash. Why?
Join Date: Jul 2014
Posts: 5Rep Power: 4
Hi, I am a beginner with OpenFOAM and CFD in general.
I am experimenting with the first tutorial, the square cavity. For my first modifications I edited the mesh size. Changing from 20x20 to 40x40 caused no problem. However if I edit blockmeshdict to give me a 100x100 mesh then icoFoam crashes.
I get this:
Courant Number mean: 5.32474e+87 max: 2.58355e+89 #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 at ??:? #7 at ??:? #8 at ??:? #9 at ??:? #10 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #11 at ??:? Floating point exception (core dumped)
Last edited by wyldckat; July 6, 2014 at 05:17. Reason: Added [CODE][/CODE]
|July 6, 2014, 05:23||
Join Date: Mar 2009
Location: Lisbon, Portugal
Blog Entries: 39Rep Power: 99
Notice this at the top of the output you've given?
I strongly suggest that you read the User Guide more carefully and take notes, because in the User Guide, section "18.104.22.168 Changing time and time step" it explains how the mesh resolution relates to the Courant Number and how the "deltaT" value should be adapted to the new mesh resolution.
If you did take this into account, you should have indicated what calculations you made and the "deltaT" value you used
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