CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM

interFoam Error

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 24, 2010, 03:52
Default interFoam Error
  #1
Member
 
Join Date: Mar 2009
Location: Sydney, New South Wales, Australia
Posts: 42
Rep Power: 17
rassilon is on a distinguished road
Hi Foamers,

I am attempting to model a device that I have meshed using snappyHexMesher and run using the interFoam solver, however I get a floating point exception error at the very first iteration.

The error looks like this:

Quote:

#0 Foam::error:: printStack(Foam::Ostream&) in "/usr/OpenFoam/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
#1 Foam::sigFpe::sigFpeHandler(int) in "/usr/OpenFoam/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
#2 ?? in "/lib/libc.so.6"
#3 void Foam::MULES::limiter<Foam:neField, Foam::zeroField, Foam::zeroField>(Foam::Field<double>&, Foam:neField const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::zeroField const&, Foam::zeroField const&, double, double, int) in "/usr/OpenFoam/OpenFOAM-1.6/lib/linux64GccDPOpt/libfiniteVolume.so"
#4 void Foam::MULES::explicitSolve<Foam:neField, Foam::zeroField, Foam::zeroField>(Foam:neField const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh>&, Foam::zeroField const&, Foam::zeroField const&, double, double) in "/usr/OpenFoam/OpenFOAM-1.6/lib/linux64GccDPOpt/libfiniteVolume.so"
#5 Foam::MULES::explicitSolve(Foam::GeometricField<do uble, Foam::fvPatchField, Foam::volMesh>&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh>&, double, double) in "/usr/OpenFoam/OpenFOAM-1.6/lib/linux64GccDPOpt/libfiniteVolume.so"
#6 main in "/usr/OpenFoam/OpenFOAM-1.6/applications/bin/linux64GccDPOpt/interFoam"
#7 __libc_start_main in "/lib/libc.so.6"
#8 _start at /usr/src/packages/BUILD/glibc-2.9/csu/../sysdeps/x86_64/elf/start.S:116
Floating point exception
I am not sure if it is because snappy has poorly created my mesh, or if it is for some other reason, like the solver or poor boundary conditions.

The error at #3 looks like it may be some kind of field problem. Could it be that the fields are not initialising correctly using setFields?

If anybody has any ideas, I would love to hear them!


R
rassilon is offline   Reply With Quote

Old   May 24, 2010, 11:35
Default
  #2
Senior Member
 
Kent Wardle
Join Date: Mar 2009
Location: Illinois, USA
Posts: 219
Rep Power: 21
kwardle is on a distinguished road
Did you run checkMesh on the generated mesh to make sure nothing crazy is happening with the mesh? I would also indeed first check that you have initialized your alpha1 field correctly--make sure to patch a little into the domain on any inlet boundaries you may have--this helps the solution get started. If you are still having problems, can you post your fvSolution and fvSchemes settings?
Just a couple thoughts that may or may not help...
kwardle is offline   Reply With Quote

Old   May 25, 2010, 03:38
Default
  #3
Member
 
Join Date: Mar 2009
Location: Sydney, New South Wales, Australia
Posts: 42
Rep Power: 17
rassilon is on a distinguished road
Quote:
Originally Posted by kwardle View Post
Did you run checkMesh on the generated mesh to make sure nothing crazy is happening with the mesh? I would also indeed first check that you have initialized your alpha1 field correctly--make sure to patch a little into the domain on any inlet boundaries you may have--this helps the solution get started. If you are still having problems, can you post your fvSolution and fvSchemes settings?
Just a couple thoughts that may or may not help...

Thanks for replying Kent.

checkMesh does give the all clear, however also identifies quite a few ployhedra. Not sure if this is suitable for use with interFoam.

Quote:

Overall number of cells of each type:
hexahedra: 155577
prisms: 4483
wedges: 0
pyramids: 0
tet wedges: 72
tetrahedra: 0
polyhedra: 24137
My FV Schemes files looks thus:

Quote:

ddtSchemes
{
default Euler;
}

gradSchemes
{
default Gauss linear;
grad(U) Gauss linear;
grad(alpha1) Gauss linear;
}

divSchemes
{
div(rho*phi,U) Gauss linear;
div(phi,alpha) Gauss vanLeer;
div(phirb,alpha) Gauss interfaceCompression;
}

laplacianSchemes
{
default Gauss linear corrected;
}

interpolationSchemes
{
default linear;
}

snGradSchemes
{
default corrected;
}

fluxRequired
{
default no;
p;
pcorr;
alpha1;
}
And my FvSolution:

Quote:

solvers
{
pcorr
{
solver PCG;
preconditioner DIC;
tolerance 1e-10;
relTol 0;
}

p
{
solver PCG;
preconditioner DIC;
tolerance 1e-07;
relTol 0.05;
}

pFinal
{
solver PCG;
preconditioner DIC;
tolerance 1e-07;
relTol 0;
}

U
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-06;
relTol 0;
}
}

PISO
{
momentumPredictor no;
nCorrectors 3;
nNonOrthogonalCorrectors 0;
nAlphaCorr 1;
nAlphaSubCycles 2;
cAlpha 1;
}
Any thoughts?


R
rassilon is offline   Reply With Quote

Old   May 25, 2010, 05:04
Default
  #4
Senior Member
 
Nima Samkhaniani
Join Date: Sep 2009
Location: Tehran, Iran
Posts: 1,266
Blog Entries: 1
Rep Power: 24
nimasam is on a distinguished road
if u use groovyBC for boundary condition add following statement in to controlDic;
libs ( "libOpenFOAM.so" "libgroovyBC.so" ) ;

even though check ur boundary condition and initial condition and change them to none Zero value! maybe work
nimasam is offline   Reply With Quote

Old   May 26, 2010, 11:07
Default
  #5
Senior Member
 
Kent Wardle
Join Date: Mar 2009
Location: Illinois, USA
Posts: 219
Rep Power: 21
kwardle is on a distinguished road
Polyhedral cells are not a problem--they actually should be more accurate. You haven't said what kind of problem you are trying to solve. A general description would be helpful for a diagnosis. Did you check your initialization for volume fraction and make sure it is doing what you think it is? Since you are getting a floating point error perhaps you are dividing by zero somewhere.
kwardle is offline   Reply With Quote

Old   May 31, 2010, 02:48
Default
  #6
Member
 
Join Date: Mar 2009
Location: Sydney, New South Wales, Australia
Posts: 42
Rep Power: 17
rassilon is on a distinguished road
Quote:
Originally Posted by kwardle View Post
Polyhedral cells are not a problem--they actually should be more accurate. You haven't said what kind of problem you are trying to solve. A general description would be helpful for a diagnosis. Did you check your initialization for volume fraction and make sure it is doing what you think it is? Since you are getting a floating point error perhaps you are dividing by zero somewhere.

Hi Kent,

Thanks for getting back to me. I seem to have got it working now - It appeared to be some kind of scaling problem when I used the transformPoints utility - I went back to the beginning and started over, and this seems to be the sticking point, but it looks like I have it working now.

Hopefully I won't have any more problems!

Cheers,


R
rassilon is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[swak4Foam] GroovyBC the dynamic cousin of funkySetFields that lives on the suburb of the mesh gschaider OpenFOAM Community Contributions 300 October 29, 2014 19:00
OpenFOAM on MinGW crosscompiler hosted on Linux allenzhao OpenFOAM Installation 127 January 30, 2009 20:08
[Netgen] Compiling Netgen on Fedora Core is driving me crazy jango OpenFOAM Meshing & Mesh Conversion 3 November 9, 2007 14:29
DecomposePar links against liblamso0 with OpenMPI jens_klostermann OpenFOAM Bugs 11 June 28, 2007 18:51
user defined function cfduser CFX 0 April 29, 2006 11:58


All times are GMT -4. The time now is 01:20.