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CFD analysis not converging

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Old   August 28, 2018, 08:54
Default CFD analysis not converging
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Ruggero Poletto
Join Date: Nov 2013
Posts: 34
Rep Power: 10
rupole1185 is on a distinguished road
Hello everyone,

I have a bit troubles with OpenFOAM and a mesh I made using SNAPPY.
Basically I don't get it to converge!!

I attach here the checkMesh result:

Code:
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  5.x                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 5.x-197d9d3bf20a
Exec   : checkMesh
Date   : Aug 28 2018
Time   : 13:46:13
Host   : "rupole1185-desktop"
PID    : 5212
I/O    : uncollated
Case   : /home/rupole1185/PROJECT/opencases/SIMULAZIONI/ENG-35/MONOBLOCCO-4_5-STALLA
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

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

Create polyMesh for time = 0

Time = 0

Mesh stats
    points:           8472097
    faces:            24516039
    internal faces:   24338367
    cells:            8025096
    faces per cell:   6.0877
    boundary patches: 3
    point zones:      0
    face zones:       1
    cell zones:       1

Overall number of cells of each type:
    hexahedra:     7790546
    prisms:        5053
    wedges:        0
    pyramids:      0
    tet wedges:    53
    tetrahedra:    2
    polyhedra:     229442
    Breakdown of polyhedra by number of faces:
        faces   number of cells
            4   2185
            5   5133
            6   65868
            7   184
            8   68
            9   96772
           10   6
           11   2
           12   35489
           13   1
           14   5
           15   23301
           18   428

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
                    wall    20322    21096  ok (non-closed singly connected)
                impeller   139105   144658      ok (closed singly connected)
                simmetry    18245    18883  ok (non-closed singly connected)

Checking geometry...
    Overall domain bounding box (-5.00012 -5.75081 -4.15041) (5 5.75081 5.85)
    Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
    Mesh has 3 solution (non-empty) directions (1 1 1)
    Boundary openness (-5.36511e-16 -1.45746e-16 -2.70403e-17) OK.
    Max cell openness = 4.33313e-16 OK.
    Max aspect ratio = 7.73036 OK.
    Minimum face area = 3.36406e-07. Maximum face area = 0.0604344.  Face area magnitudes OK.
    Min volume = 2.5461e-08. Max volume = 0.0103205.  Total volume = 879.703.  Cell volumes OK.
    Mesh non-orthogonality Max: 59.9991 average: 5.3405
    Non-orthogonality check OK.
    Face pyramids OK.
 ***Max skewness = 9.32017, 11 highly skew faces detected which may impair the quality of the results
  <<Writing 11 skew faces to set skewFaces
    Coupled point location match (average 0) OK.

Failed 1 mesh checks.

End
And I also attach the info about the inlet and system directories
Attached Images
File Type: png residuals.png (6.9 KB, 10 views)
Attached Files
File Type: gz CFD.tar.gz (9.4 KB, 1 views)
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