| 1988 |
April 18, 2014 02:23 |
Foam::error::printStack
hi Formers
I am using IcoFoam solver and I didn't have any problem but as soon as scaling the geometry to millimeter I have got this error during processing.
Code:
Time = 0.006
Courant Number mean: 4.75321e+76 max: 3.75818e+81
DILUPBiCG: Solving for Ux, Initial residual = 0.999964, Final residual = 1.021, No Iterations 1001
DILUPBiCG: Solving for Uy, Initial residual = 0.999977, Final residual = 1.08934, No Iterations 1001
DILUPBiCG: Solving for Uz, Initial residual = 0.999987, Final residual = 1.05489, No Iterations 1001
DICPCG: Solving for p, Initial residual = 1, Final residual = 2.87353, No Iterations 1001
DICPCG: Solving for p, Initial residual = 4.77489e-26, Final residual = 4.77489e-26, No Iterations 0
DICPCG: Solving for p, Initial residual = 4.77489e-26, Final residual = 4.77489e-26, No Iterations 0
time step continuity errors : sum local = 7.20173e+114, global = 3.05681e+97, cumulative = 3.05681e+97
DICPCG: Solving for p, Initial residual = 2.08226e-25, Final residual = 2.08226e-25, No Iterations 0
DICPCG: Solving for p, Initial residual = 2.08226e-25, Final residual = 2.08226e-25, No Iterations 0
DICPCG: Solving for p, Initial residual = 2.08226e-25, Final residual = 2.08226e-25, No Iterations 0
time step continuity errors : sum local = 3.14056e+115, global = -4.27954e+98, cumulative = -3.97386e+98
ExecutionTime = 869.68 s ClockTime = 874 s
Time = 0.007
Courant Number mean: 3.30783e+115 max: 3.16723e+119
[0] #0 [1] #0 Foam::error::printStack(Foam::Ostream&)Foam::error::printStack(Foam::Ostream&) at ??:?
[0] #1 Foam::sigFpe::sigHandler(int) at ??:?
[1] #1 Foam::sigFpe::sigHandler(int) at ??:?
[0] #2 Uninterpreted:
[0] #3 at ??:?
[1] #2 Uninterpreted:
[1] #3 in "/usr/lib/libmpi.so.0"
[0] #4 in "/usr/lib/libmpi.so.0"
[1] #4 in in "/usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so"
[1] #5 "/usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so"
[0] #5 in "/usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so"
[1] #6 PMPI_Allreduce in "/usr/lib/openmpi/lib/openmpi/mca_coll_tuned.so"
[0] #6 PMPI_Allreduce in "/usr/lib/libmpi.so.0"
[1] #7 void Foam::allReduce<double, Foam::sumOp<double> >(double&, int, ompi_datatype_t*, ompi_op_t*, Foam::sumOp<double> const&, int) in "/usr/lib/libmpi.so.0"
[0] #7 void Foam::allReduce<double, Foam::sumOp<double> >(double&, int, ompi_datatype_t*, ompi_op_t*, Foam::sumOp<double> const&, int) at ??:?
[1] #8 Foam::reduce(double&, Foam::sumOp<double> const&, int) at ??:?
[0] #8 Foam::reduce(double&, Foam::sumOp<double> const&, int) at ??:?
[1] #9 at ??:?
[0] #9 Foam::PBiCG::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) constFoam::PBiCG::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
[0] #10 at ??:?
[1] #10
[0] at ??:?
[0] #11 [1] at ??:?
[1] #11
[0] at ??:?
[0] #12 [1] at ??:?
[1] #12
[0] at ??:?
[0] #13 [1] at ??:?
[1] #13
[0] at ??:?
[0] #14 [1] at ??:?
[1] #14
[0] at ??:?
[0] #15 __libc_start_main[1] at ??:?
[1] #15 __libc_start_main in "/lib/i386-linux- in gnu/libc.so.6"
[0] #16 "/lib/i386-linux-gnu/libc.so.6"
[1] #16
[1] at ??:?
I have read this link but I could not find the solution
HTML Code:
http://www.cfd-online.com/Forums/openfoam-solving/95674-high-courant-number-icofoam.html
this is checkMesh
Code:
Create polyMesh for time = 0
Time = 0
Mesh stats
points: 302592
faces: 885385
internal faces: 864251
cells: 291606
faces per cell: 6
boundary patches: 3
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
hexahedra: 291606
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 0
Checking topology...
Boundary definition OK.
Cell to face addressing OK.
Point usage OK.
Upper triangular ordering OK.
Face vertices OK.
Number of regions: 1 (OK).
Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
body 19650 19700 ok (non-closed singly connected)
inlet 742 768 ok (non-closed singly connected)
outlet 742 768 ok (non-closed singly connected)
Checking geometry...
Overall domain bounding box (-0.0142294 0 -0.0151572) (0.0129588 0.0472016 0.0022)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (3.0901e-17 -9.27854e-17 -1.34611e-16) OK.
Max cell openness = 3.32518e-16 OK.
Max aspect ratio = 9.66007 OK.
Minimum face area = 8.65714e-10. Maximum face area = 8.93054e-08. Face area magnitudes OK.
Min volume = 2.58464e-13. Max volume = 1.87293e-11. Total volume = 1.09182e-06. Cell volumes OK.
Mesh non-orthogonality Max: 24.5048 average: 5.06496
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 0.361877 OK.
Coupled point location match (average 0) OK.
Mesh OK.
End
and this is the controldict file:
Code:
application icoFoam;
startFrom startTime;
startTime 0;
stopAt endTime;
endTime 4.8;
deltaT 0.001;
writeControl timeStep;
writeInterval 20;
purgeWrite 0;
writeFormat ascii;
writePrecision 6;
writeCompression off;
timeFormat general;
timePrecision 6;
runTimeModifiable true;
libs (
"libOpenFOAM.so"
"libgroovyBC.so"
) ;
fvSchemes(completely the same as fvscheme which had been defined in cavity folder)
Code:
ddtSchemes
{
default Euler;
}
gradSchemes
{
default Gauss linear;
grad(p) Gauss linear;
}
divSchemes
{
default none;
div(phi,U) Gauss linear;
}
laplacianSchemes
{
default none;
laplacian(nu,U) Gauss linear orthogonal;
laplacian((1|A(U)),p) Gauss linear orthogonal;
}
interpolationSchemes
{
default linear;
interpolate(HbyA) linear;
}
snGradSchemes
{
default orthogonal;
}
fluxRequired
{
default no;
p ;
}
this is fvSolution again the same as cavity example \
Code:
solvers
{
p
{
solver PCG;
preconditioner DIC;
tolerance 1e-06;
relTol 0;
}
U
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-05;
relTol 0;
}
}
PISO
{
nCorrectors 2;
nNonOrthogonalCorrectors 0;
pRefCell 0;
pRefValue 0;
}
is there anyone who can give the solution?
thanks :) |
