| Haier |
September 25, 2014 06:47 |
dynamic mesh problem with Oscillating B.C.
4 Attachment(s)
Dear Foamers,
I have been struggling with a problem (similar to wave tank/basin) related to dynamic mesh where I am trying to apply an oscillating boundary. The following are the basic settings:
- OF v2.3.0 on Suse 13.1
- solver: interDyMFoam
In constant/dynamicMeshDict
Code:
dynamicFvMesh dynamicMotionSolverFvMesh;
motionSolverLibs ("libfvMotionSolvers.so");
solver displacementLaplacian;
displacementLaplacianCoeffs
{
diffusivity inverseDistance (movingBody);
}
In 0/pointDisplacement
Code:
boundaryField
{
...
sidePlane
{
type slip;
}
...
movingBody
{
type oscillatingDisplacement;
amplitude (0 0 1.0);
omega 1.0;
value uniform (0 0 0);
}
}
also, in system/fvSolution.solvers:
Code:
cellDisplacement
{
solver GAMG;
tolerance 1e-8;
relTol 0;
smoother GaussSeidel;
cacheAgglomeration true;
nCellsInCoarsestLevel 10;
agglomerator faceAreaPair;
mergeLevels 1;
}
cellDisplacementFinal
{
$cellDisplacement;
tolerance 1e-8;
relTol 0;
}
Here is part of the error message I got:
Code:
[0] #0 Foam::error::printStack(Foam::Ostream&) at ??:?
[0] #1 Foam::sigFpe::sigHandler(int) at ??:?
[0] #2 in "/lib64/libc.so.6"
[0] #3 Foam::GAMGSolver::scale(Foam::Field<double>&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const at ??:?
[0] #4 Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMatrix::smoother> const&, Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const at ??:?
[0] #5 Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
[0] #6 Foam::fvMatrix<double>::solveSegregated(Foam::dictionary const&) at ??:?
[0] #7 Foam::fvMatrix<double>::solve(Foam::dictionary const&) at ??:?
[0] #8
[0] at ??:?
[0] #9 __libc_start_main in "/lib64/libc.so.6"
[0] #10
[0] at /home/abuild/rpmbuild/BUILD/glibc-2.18/csu/../sysdeps/x86_64/start.S:125
The error message seems to indicate something went wrong while using GAMG solver. When I visualized the mesh movement, weird "ripple" near moving boundary were observed on the "sidePlane" which is supposed to be flat, see attachment. "Ripple" occurred around t=0.699 and the simulation crashed shortly after (around t=0.793).
Right now I am doubting if the "slip" type BC is the cause. Anyone has experience to share or bother to give any comments?
Thanks,
H. |
