[wayne14]

Hi all,

I have been trying to generate a multi block structured mesh for OpenFOAM. I export the polyMesh folder and use checkMesh to examine the mesh. I got the following message:

Checking topology...
    Boundary definition OK.
 ***Total number of faces on empty patches is not divisible by the number of cells in the mesh. Hence this mesh is not 1D or 2D.
    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                  
    buildingWall        4300     4410     ok (non-closed singly connected)  
    frontAndBack        20000    20502    ok (non-closed singly connected)  
    inlet               50       102      ok (non-closed singly connected)  
    lowerWall           100      212      ok (non-closed singly connected)  
    outlet              50       102      ok (non-closed singly connected)  
    upperWall           200      402      ok (non-closed singly connected)  

Checking geometry...
    Overall domain bounding box (0 -0.06 0) (0.6 0.42 0.06)
    Mesh (non-empty, non-wedge) directions (1 1 0)
    Mesh (non-empty) directions (1 1 0)
    All edges aligned with or perpendicular to non-empty directions.
    Boundary openness (5.89915e-18 2.79434e-18 1.65293e-16) OK.
    Max cell openness = 1.09092e-16 OK.
    Max aspect ratio = 7.51167 OK.
    Minimum face area = 9e-06. Maximum face area = 0.0013521.  Face area magnitudes OK.
    Min volume = 5.4e-07. Max volume = 4.0563e-06.  Total volume = 0.0162.  Cell volumes OK.
    Mesh non-orthogonality Max: 0 average: 0
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 4.62963e-09 OK.
    Coupled point location match (average 0) OK.

Mesh OK.

After the solver convergence, I find that the fluid would not go from one block into the other one. There is a domain between those two blocks, what should I do to enable the fluid to go through the interface between those two blocks?
One more thing, I first create a domain, than I extrude to get a block. Then I copy and paste the block next to the original one.

Thank you!

Regards!

[tcarrigan]

It sounds like the grid might have duplicate domains at the interface between the adjacent blocks. You can confirm this by going to Grid, Merge in Pointwise.

[wayne14]

Thank you Travis,
Yes, the duplicate domains are displayed when I click the 'Merge' button. I try to use the merge command to solve this problem, but unfortunately I did not succeed.
Are there some convenient way to delete the duplicate domains without break the established block?

Thanks again!

Wayne

[tcarrigan]

Because you have two domains at the interface you'll need to merge the duplicate set of connectors. To do this they'll need to have the same number of points. Once the connectors have been merged verify you have a single domain at the interface. You may need to just delete one of the domains and reassemble the block.

[wayne14]

Thank you,
Actually I am working on the official tutorial case 'BackStep'. I think the problem is the internal face between the two blocks. OpenFOAM has problems with internal face, do you have any idea on this issue?

[dgarlisch]

One more thing to check.

Make sure you do NOT have a BC applied to the internal domain between the blocks. If you do, the quad faces on that domain will be inflated during export to produce an infinitely thin wall.

[mishal49]

hello
so how should that one domain in the center be defined in PW to be used for openFOAM? Should it be defined as a patch? But then OF will require a BC be applied on that patch.