[nileshjrane]

I have made a mesh in blockMesh after a long struggle. But now i am not able to run any kind of solver run with it. COmpressible, imcompressible, laminar, turbulent, inviscid, p-based, rho-based...nthing seems to work. Everytime i get huge negative pressures, huge courant numbers and divergence no matter what BC or solver setting i use.

So i am wondering is is because of the mesh??? Now my mesh is pretty coarse, no refinment at all. nice hex mesh, with only one problem, that i had to do mergepatchpairs and which gives some distorted cells.

This is the output of checkMesh:

Create time

Create polyMesh for time = 0

Time = 0

Mesh stats
points: 62755
faces: 182738
internal faces: 175446
cells: 60000
boundary patches: 7
point zones: 1
face zones: 3
cell zones: 0

Overall number of cells of each type:
hexahedra: 55098
prisms: 4196
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 706

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
Combustor 1692 1854 ok (non-closed singly connected)
Head 1000 1040 ok (non-closed singly connected)
Fuelinlet 200 201 ok (non-closed singly connected)
AirinletX 400 401 ok (non-closed singly connected)
AirinletY 400 401 ok (non-closed singly connected)
Outlet 1200 1201 ok (non-closed singly connected)
Airpipe 2400 2544 ok (non-closed singly connected)

Checking geometry...
Overall domain bounding box (-0.089 -0.089 0) (0.17 0.17 1)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (-3.46157e-17 3.39964e-16 -3.75078e-16) OK.
***High aspect ratio cells found, Max aspect ratio: 1632.72, number of cells 400
<<Writing 400 cells with high aspect ratio to set highAspectRatioCells
Minumum face area = 1.24511e-09. Maximum face area = 0.00112629. Face area magnitudes OK.
Min volume = 2.37717e-10. Max volume = 4.87164e-06. Total volume = 0.0260461. Cell volumes OK.
Mesh non-orthogonality Max: 68.7054 average: 9.51964
Non-orthogonality check OK.
Face pyramids OK.
***Max skewness = 5.59368, 8 highly skew faces detected which may impair the quality of the results
<<Writing 8 skew faces to set skewFaces

Failed 2 mesh checks.

End

As you can see, i got 8 skew cells but max skewness is about 6. what this number 5.59 in checkmesh signifies??? What value is good?? (in Gambit 0.85 for hex is considered all right.)


And please give me some comment, that whether these few bad cells can be the nemesis of my simulation??? Should i think of remeshing??

Please help. I am already frustrated a lot..