| xiaof |
October 31, 2013 23:08 |
strange result for non-orthogonality mesh using icoFoam
2 Attachment(s)
hello everyone
I am simulating a duct flow with icoFoam. I use periodic boundary condition for inlet and outlet.The other boundary condition I set as no-slip.
I have attached the velocity profile here.You can find that there are some velocity jumps which I think affected by the mesh.
The followings are the fvschemes, fvsolution, and the result of the checkMesh.
Thank you in advance.
fvSchemes
Code:
ddtSchemes
{
default Euler;
}
gradSchemes
{
default cellMDLimited leastSquares 1;
// grad(p) Gauss linear;
}
divSchemes
{
default none;
div(phi,U) Gauss reconCentral cellLimited leastSquares 1.0;
div(phi) Gauss linearUpwindV cellMDLimited leastSquares 1.0;
}
laplacianSchemes
{
default Gauss linear corrected;
laplacian(nu,U) Gauss linear corrected;
laplacian((1|A(U)),p) Gauss linear corrected;
laplacian(DT,T) Gauss linear corrected;
}
interpolationSchemes
{
default linear;
interpolate(HbyA) linear;
}
snGradSchemes
{
default corrected;
}
fluxRequired
{
default no;
p;
}
fvSolution
Code:
solvers
{
p
{
solver PCG;
preconditioner DIC;
tolerance 1e-08;
relTol 0;
};
U
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-08;
relTol 0;
};
}
PISO
{
nCorrectors 3;
nNonOrthogonalCorrectors 2;
pRefCell 0;
pRefValue 0;
}
checkMesh
Code:
Create time
Create polyMesh for time = 0
Time = 0
Mesh stats
points: 48548
faces: 119960
internal faces: 94888
cells: 35808
boundary patches: 2
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
hexahedra: 35808
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 0
Checking topology...
Boundary definition 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
INTERFACE 1200 1600 ok (non-closed singly connected)
inout 23872 24274 ok (non-closed singly connected)
Checking geometry...
This is a 3-D mesh
Overall domain bounding box (-1 -1 -4.33680869e-19) (1 1 0.01999999955)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Mesh (non-empty, non-wedge) dimensions 3
Boundary openness (6.5506050833e-20 -8.7921189539e-20 -1.6233662817e-19) Threshold = 1e-06 OK.
Max cell openness = 2.1714371522e-16 OK.
Max aspect ratio = 350.00000279 OK.
Minumum face area = 9.999999e-08. Maximum face area = 0.0011896420623. Face area magnitudes OK.
Min volume = 6.6666658486e-10. Max volume = 7.9309469101e-06. Total volume = 0.0799999982. Cell volumes OK.
Mesh non-orthogonality Max: 44.27477573 average: 9.93239561 Threshold = 70
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 0.57381680369 OK.
Mesh OK.
End
xiaof |
