[slayengine]

Hi community,
Asked Google, tried for hours, and didn't find any solution. Newbie to CFD, so give me a chance

At first, could you kindly look at my checkMesh:

/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.1                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 4.1
Exec   : checkMesh -allTopology
Date   : Jan 27 2017
Time   : 18:04:47
Host   : "osboxes"
PID    : 4257
Case   : /home/osboxes/OpenFOAM/osboxes-4.1/run/Fluent/v34_OF_2
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create polyMesh for time = 0

Enabling all (cell, face, edge, point) topology checks.

Time = 0

Mesh stats
    points:           2928432
    faces:            8437381
    internal faces:   8090609
    cells:            2754665
    faces per cell:   6
    boundary patches: 4
    point zones:      0
    face zones:       1
    cell zones:       1

Overall number of cells of each type:
    hexahedra:     2754665
    prisms:        0
    wedges:        0
    pyramids:      0
    tet wedges:    0
    tetrahedra:    0
    polyhedra:     0

Checking topology...
    Boundary definition OK.
    Cell to face addressing OK.
    Point usage OK.
    Upper triangular ordering OK.
    Face vertices OK.
    Topological cell zip-up check OK.
    Face-face connectivity OK.
  <<Writing 29 cells with zero or one non-boundary face to set oneInternalFaceCells
  <<Writing 582 cells with two non-boundary faces to set twoInternalFacesCells
   *Number of regions: 12
    The mesh has multiple regions which are not connected by any face.
  <<Writing region information to "0/cellToRegion"
  <<Writing region 0 (fully disconnected) with 2754654 cells to cellSet region0
  <<Writing region 1 (fully disconnected) with 1 cells to cellSet region1
  <<Writing region 2 (fully disconnected) with 1 cells to cellSet region2
  <<Writing region 3 (fully disconnected) with 1 cells to cellSet region3
  <<Writing region 4 (fully disconnected) with 1 cells to cellSet region4
  <<Writing region 5 (fully disconnected) with 1 cells to cellSet region5
  <<Writing region 6 (fully disconnected) with 1 cells to cellSet region6
  <<Writing region 7 (fully disconnected) with 1 cells to cellSet region7
  <<Writing region 8 (fully disconnected) with 1 cells to cellSet region8
  <<Writing region 9 (fully disconnected) with 1 cells to cellSet region9
  <<Writing region 10 (fully disconnected) with 1 cells to cellSet region10
  <<Writing region 11 (fully disconnected) with 1 cells to cellSet region11

Checking patch topology for multiply connected surfaces...
    Patch               Faces    Points   Surface topology                  
    inlet               8991     9390     ok (non-closed singly connected)  
    outlet              9923     11912    ok (non-closed singly connected)  
    wall1               273270   275342   ok (non-closed singly connected)  
    wall2               54588    54300    multiply connected (shared edge)  
  <<Writing 328 conflicting points to set nonManifoldPoints

Checking geometry...
    Overall domain bounding box (-0.0041 -0.0025 -5e-05) (0.01555 0.01395 0.0011)
    Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
    Mesh has 3 solution (non-empty) directions (1 1 1)
    Boundary openness (3.65153e-18 6.74917e-18 -5.68701e-16) OK.
    Max cell openness = 1.65436e-16 OK.
    Max aspect ratio = 1 OK.
    Minimum face area = 2.5e-09. Maximum face area = 2.5e-09.  Face area magnitudes OK.
    Min volume = 1.25e-13. Max volume = 1.25e-13.  Total volume = 3.44333e-07.  Cell volumes OK.
    Mesh non-orthogonality Max: 0 average: 0
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 3.46945e-13 OK.
    Coupled point location match (average 0) OK.

Mesh OK.

End

The bold marked "wall2" is the issue. It's an internal wall.
I just don't understand what that means: "multiple regions[...]not connected by any face". These consist of single points, so are these really 'regions' ?? Whats wrong with my mesh?!

simpleFoam calculated the velocities, thereafter the p-solver explodes (divison by 0).



Case running well, when I do have only ONE region (easier setup / mesh).


Technical stuff: simpleFoam, incompressible, laminar. Mesh prepared with Altair Hypermesh.

Would be so great, if you could help me. Trying since weeks with efforts, but without reasonable results.