| CrisMoreira |
June 16, 2015 19:23 |
Mesh Problems after extrudeMesh
2 Attachment(s)
Greetings,
i want to refine a contour of a structure inside a simple box created using blockMesh.
Using Salome, i created the .stl file needed and used Helyx to confirm that everyting was ok.
Also, using cellSet i created a zone neer the contour in order to obtain a better refinement.
Everything was ok. Only a problem appeared do to fact that i was creating a 3D mesh that in reality was 2D (Ny=1 and ymax=0.01) with blockMeshDict.
I was expecting to solve this problem with extrudeMesh but something went wrong.
The commands used are:
blockMesh
setSet -batch setRefin
refineMesh -dict system -overwrite
surfaceFeatureExtract (with 180º)
snappyHexMesh -overwrite
---- till now the only problem was only the 3D that need to be 2D ----
So i run extrudeMesh (as i have done in previously cases) but the mesh appeared with several errors. (see images)
extrudeMeshDict:
Code:
// What to extrude:
// patch : from patch of another case ('sourceCase')
constructFrom patch;
sourceCase ;
sourcePatches (empty1);
// If construct from patch: patch to use for back (can be same as sourcePatch)
exposedPatchName empty1;
// Flip surface normals before usage.
flipNormals false;
//- Linear extrusion in point-normal direction
extrudeModel linearNormal;
nLayers 1;
expansionRatio 1.0;
linearNormalCoeffs
{
thickness 0.01;
}
// Do front and back need to be merged? Usually only makes sense for 360
// degree wedges.
mergeFaces false;
Can anyone give me a tip on how to solve this problem?
Error message:
Code:
cd 15
cristina@cristina-HP-Pavilion-g6-Notebook-PC:~/OpenFOAM/cristina-2.2.2/run/test/15$ checkMesh
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.2.2 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 2.2.2-9240f8b967db
Exec : checkMesh
Date : Jun 17 2015
Time : 11:20:00
Host : "cristina-HP-Pavilion-g6-Notebook-PC"
PID : 5172
Case : /home/cristina/OpenFOAM/cristina-2.2.2/run/test/15
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: 1693614
internal points: 0
faces: 3359069
internal faces: 1671689
cells: 837421
faces per cell: 6.00744
boundary patches: 7
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
hexahedra: 831276
prisms: 186
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 5959
Breakdown of polyhedra by number of faces:
faces number of cells
7 5501
8 457
9 1
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 200 402 ok (non-closed singly connected)
outlet 400 802 ok (non-closed singly connected)
bottom 2617 5238 ok (non-closed singly connected)
empty1 1674842 1693614 ok (non-closed singly connected)
empty2 0 0 ok (empty)
atmosphere 2710 5422 ok (non-closed singly connected)
ramp_solid 6611 13224 ok (non-closed singly connected)
Checking geometry...
Overall domain bounding box (0 -0.01 -6.96284e-27) (13.95 0.000535259 1)
Mesh (non-empty, non-wedge) directions (0 0 0)
Mesh (non-empty) directions (0 0 0)
***Number of edges not aligned with or perpendicular to non-empty directions: 20428
<<Writing 26756 points on non-aligned edges to set nonAlignedEdges
Boundary openness (2.52486e-18 8.58837e-12 1.05755e-16) OK.
Max cell openness = 2.15239e-16 OK.
Max aspect ratio = -1 OK.
Minimum face area = 4.38e-08. Maximum face area = 6.98e-05. Face area magnitudes OK.
Min volume = 2.02056e-10. Max volume = 3.49e-07. Total volume = 0.138252. Cell volumes OK.
Mesh non-orthogonality Max: 143.36 average: 1.80463
*Number of severely non-orthogonal (> 70 degrees) faces: 69.
***Number of non-orthogonality errors: 36.
<<Writing 105 non-orthogonal faces to set nonOrthoFaces
***Error in face pyramids: 208 faces are incorrectly oriented.
<<Writing 172 faces with incorrect orientation to set wrongOrientedFaces
***Max skewness = 9.84588, 1 highly skew faces detected which may impair the quality of the results
<<Writing 1 skew faces to set skewFaces
Coupled point location match (average 0) OK.
Failed 4 mesh checks.
End
Best regards
Cristina |
