[Yuby]

Hi FOAMers! How are you?

Thank you for being there! You have helped me a lot with my thesis.

I have several problems with OpenFOAM. I am studying a external incompressible and turbulent flow around a rotating solid, and I created different regions in order to have different surface refinement as said in this thread: http://www.cfd-online.com/Forums/ope...e-stlfile.html

If I execute the surfaceCheck utility, it says to me that the surface is not closed. Is it correct? I mean, there are two STL in one, because I copied the text from one to another in order to create the patches. Should it be closed or non closed? I'm confused, because snappyhexmesh works with closed surfaces, doesn't it?

Apart from that, if I ran the checkMesh utility after creating the mesh, it gives to me this code:

/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.3.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 2.3.0-f5222ca19ce6
Exec   : checkMesh
Date   : Apr 18 2015
Time   : 14:12:02
Host   : "usuario-SATELLITE-P50-A-14G"
PID    : 11020
Case   : /home/usuario/UltraStar/UltraStar2
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Disallowing user-supplied system call operations

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

Create polyMesh for time = 0

Time = 0

Mesh stats
    points:           5590751
    faces:            16070256
    internal faces:   15907992
    cells:            5248232
    faces per cell:   6.09315
    boundary patches: 7
    point zones:      0
    face zones:       0
    cell zones:       0

Overall number of cells of each type:
    hexahedra:     4953182
    prisms:        20105
    wedges:        3
    pyramids:      0
    tet wedges:    320
    tetrahedra:    18
    polyhedra:     274604
    Breakdown of polyhedra by number of faces:
        faces   number of cells
            4   14843
            5   10504
            6   27960
            7   93719
            8   33053
            9   67083
           10   1357
           11   427
           12   16517
           13   91
           14   79
           15   8942
           16   3
           17   1
           18   25

Checking topology...
    Boundary definition OK.
    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
                   inlet       64       81  ok (non-closed singly connected)
                  outlet       64       81  ok (non-closed singly connected)
                     top       96      117  ok (non-closed singly connected)
                  bottom       96      117  ok (non-closed singly connected)
            frontandback      192      234  ok (non-closed singly connected)
                   disco   143962   159636  ok (non-closed singly connected)
                   borde    17790    23446  ok (non-closed singly connected)

Checking geometry...
    Overall domain bounding box (-1.5 -2 -2) (4.5 2 2)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (-7.13842e-17 -9.7482e-19 1.71727e-17) OK.
    Max cell openness = 4.32984e-16 OK.
    Max aspect ratio = 11.6759 OK.
    Minimum face area = 1.75439e-09. Maximum face area = 0.250366.  Face area magnitudes OK.
    Min volume = 9.42071e-13. Max volume = 0.12522.  Total volume = 95.9998.  Cell volumes OK.
    Mesh non-orthogonality Max: 64.9667 average: 6.00776
    Non-orthogonality check OK.
    Face pyramids OK.
 ***Max skewness = 4.7363, 4 highly skew faces detected which may impair the quality of the results
  <<Writing 4 skew faces to set skewFaces
    Coupled point location match (average 0) OK.

Failed 1 mesh checks.

End

This skewness is due to both STL files, if I join them in one STL this warning doesn't appear. Can I work with this problem? Is it an high value of skewness?

Thank you very much in advance!