| shaiashe |
January 3, 2023 15:03 |
exploding interFOAM (variation of DTCHull)
Hi,
I need help with my exploding simulation.
my mesh is quite large, but I made sure it's of high quality (non-ortho <70) and skewness < 3.5.
Code:
Overall domain bounding box (-150 -200 -82) (769 0 82)
Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
Mesh has 3 solution (non-empty) directions (1 1 1)
Boundary openness (5.3231506e-17 -1.9192017e-15 -7.1636234e-16) OK.
Max cell openness = 8.413231e-16 OK.
Max aspect ratio = 24.810447 OK.
Minimum face area = 6.1169547e-06. Maximum face area = 18.649767. Face area magnitudes OK.
Min volume = 1.6255701e-06. Max volume = 87.633202. Total volume = 30060593. Cell volumes OK.
Mesh non-orthogonality Max: 64.998208 average: 2.1675072
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 3.2694797 OK.
Coupled point location match (average 0) OK.
Face tets OK.
*Edges too small, min/max edge length = 4.824642e-09 4.4238302, number too small: 12
<<Writing 12 points on short edges to set shortEdges
*There are 441 faces with concave angles between consecutive edges. Max concave angle = 66.960231 degrees.
<<Writing 441 faces with concave angles to set concaveFaces
Face flatness (1 = flat, 0 = butterfly) : min = 0.68602191 average = 0.9999684
*There are 6 faces with ratio between projected and actual area < 0.8
Minimum ratio (minimum flatness, maximum warpage) = 0.68602191
<<Writing 6 warped faces to set warpedFaces
Cell determinant (wellposedness) : minimum: 0 average: 1.0646607
***Cells with small determinant (< 0.001) found, number of cells: 548
<<Writing 548 under-determined cells to set underdeterminedCells
***Concave cells (using face planes) found, number of cells: 21473
<<Writing 21473 concave cells to set concaveCells
Face interpolation weight : minimum: 0.024440083 average: 0.49344369
***Faces with small interpolation weight (< 0.05) found, number of faces: 210
<<Writing 210 faces with low interpolation weights to set lowWeightFaces
Face volume ratio : minimum: 0.0132952 average: 0.97292238
Face volume ratio check OK.
Even when I close off all of the boundaries as walls, the simulation explodes on the 2nd step with huge courant numbers (both of them).
with
Code:
Phase-1 volume fraction = 0.49988109 Min(alpha.water) = -1.2127875e-64 Max(alpha.water) = 1.0000392
does that mean the water is evaporating?
I set my fvSolution as :
Code:
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object fvSolution;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
solvers
{
"alpha.water.*"
{
nAlphaCorr 2;
nAlphaSubCycles 1;
cAlpha 1;
icAlpha 0;
MULESCorr yes;
nLimiterIter 10;
alphaApplyPrevCorr yes;
solver smoothSolver;
smoother symGaussSeidel;
tolerance 1e-8;
relTol 0;
minIter 1;
}
"pcorr.*"
{
solver GAMG;//PCG
preconditioner DIC;
smoother GaussSeidel;//Add by pol
tolerance 1e-10; //1e-10
relTol 0;
}
p_rgh
{
solver GAMG;
tolerance 1e-4; //1e-7
relTol 0.01;
smoother GaussSeidel; //DIC
nPreSweeps 0;
nPostSweeps 2;
cacheAgglomeration true; //false
nCellsInCoarsestLevel 2090;//1000
agglomerator faceAreaPair;
mergeLevels 1;
}
p_rghFinal
{
solver GAMG;
tolerance 1e-6; //1e-7
relTol 0.0;
smoother GaussSeidel; //DIC
nPreSweeps 0;
nPostSweeps 2;
cacheAgglomeration true; //false
nCellsInCoarsestLevel 2090;//1000
agglomerator faceAreaPair;
mergeLevels 1;
/*$p_rgh;
tolerance 1e-09;//1e-09
relTol 0;*/
}
"(U|k|omega).*"
{
solver smoothSolver;
smoother symGaussSeidel;
nSweeps 1;
tolerance 1e-7;
relTol 0.1;
minIter 1;
};
cellDisplacement
{
solver GAMG;
smoother GaussSeidel;
tolerance 1e-7;
relTol 0.01;
}
}
PIMPLE
{
momentumPredictor no;
nOuterCorrectors 5;
nCorrectors 5;
nNonOrthogonalCorrectors 2;
correctPhi yes;
maxCo 1;
maxAlphaCo 1;
rDeltaTSmoothingCoeff 0.05;
rDeltaTDampingCoeff 0.5;
nAlphaSpreadIter 0;
nAlphaSweepIter 0;
maxDeltaT 1;
residualControl
{
U
{
tolerance 1e-03;
relTol 0;
}
p_rgh
{
tolerance 1e-03;
relTol 0;
}
}
}
relaxationFactors
{
equations
{
p 0.3;
U 0.7;
k 0.7;
omega 0.7;
}
}
cache
{
grad(U);
}
any advise?
Cheers, |
