| Kahnbein.Kai |
November 24, 2020 00:24 |
SHM Boundaryproblems with an STL-File
1 Attachment(s)
Hello, i need your help, at my first meshing attempt with an STL-File. The STL-File ist shown below, its shape is very similar to the Dambreak tutorial. The overall lenght is about 2 m.
I do a "background" Mesh with blockMesh, all edges are 3 m long, to cover the whole STL Geometry.
After that, i do the "snappyHexMesh" command. Obviously the mesh is build right.
If i open up the case with parafoam, the consols shows many warnings.
Code:
kai@Kai-Desktop:~/OpenFOAM/kai-7/run/tutorials_of/multiphase/interFoam/laminar/damBreak_stl/damBreak$ paraFoam
I/O : uncollated
--> FOAM Warning :
From function virtual Foam::polyMesh::readUpdateState Foam::polyMesh::readUpdate()
in file meshes/polyMesh/polyMeshIO.C at line 209
unexpected consequences. Proceed with care.
--> FOAM Warning :
From function Foam::labelHashSet Foam::polyBoundaryMesh::patchSet(const Foam::UList<Foam::wordRe>&, bool, bool) const
in file meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C at line 804
Cannot find any patch or group names matching left
--> FOAM Warning :
From function Foam::labelHashSet Foam::polyBoundaryMesh::patchSet(const Foam::UList<Foam::wordRe>&, bool, bool) const
in file meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C at line 804
Cannot find any patch or group names matching end
--> FOAM Warning :
From function Foam::labelHashSet Foam::polyBoundaryMesh::patchSet(const Foam::UList<Foam::wordRe>&, bool, bool) const
in file meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C at line 804
Cannot find any patch or group names matching front
--> FOAM Warning :
From function Foam::labelHashSet Foam::polyBoundaryMesh::patchSet(const Foam::UList<Foam::wordRe>&, bool, bool) const
in file meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C at line 804
Cannot find any patch or group names matching bottom
--> FOAM Warning :
From function Foam::labelHashSet Foam::polyBoundaryMesh::patchSet(const Foam::UList<Foam::wordRe>&, bool, bool) const
in file meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C at line 804
Cannot find any patch or group names matching top
--> FOAM Warning :
From function Foam::labelHashSet Foam::polyBoundaryMesh::patchSet(const Foam::UList<Foam::wordRe>&, bool, bool) const
in file meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C at line 804
Cannot find any patch or group names matching right
--> FOAM Warning :
From function virtual Foam::polyMesh::readUpdateState Foam::polyMesh::readUpdate()
in file meshes/polyMesh/polyMeshIO.C at line 209
unexpected consequences. Proceed with care.
Before im trying to open up the case, i do a checkMesh.
Here are the results.
Code:
/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 7
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
Build : 7-1ff648926f77
Exec : checkMesh
Date : Nov 24 2020
Time : 05:59:41
Host : "Kai-Desktop"
PID : 6898
I/O : uncollated
Case : /home/kai/OpenFOAM/kai-7/run/tutorials_of/multiphase/interFoam/laminar/damBreak_stl/damBreak
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 // blockMesh
Mesh stats
points: 29791
faces: 83700
internal faces: 78300
cells: 27000
faces per cell: 6
boundary patches: 6
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
hexahedra: 27000
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.
Number of regions: 1 (OK).
Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
left 900 961 ok (non-closed singly connected)
end 900 961 ok (non-closed singly connected)
front 900 961 ok (non-closed singly connected)
bottom 900 961 ok (non-closed singly connected)
top 900 961 ok (non-closed singly connected)
right 900 961 ok (non-closed singly connected)
Checking geometry...
Overall domain bounding box (0 -3 0) (3 0 3)
Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
Mesh has 3 solution (non-empty) directions (1 1 1)
Boundary openness (1.29976e-16 1.46295e-16 6.22894e-17) OK.
Max cell openness = 2.77556e-16 OK.
Max aspect ratio = 1 OK.
Minimum face area = 0.01. Maximum face area = 0.01. Face area magnitudes OK.
Min volume = 0.001. Max volume = 0.001. Total volume = 27. Cell volumes OK.
Mesh non-orthogonality Max: 0 average: 0
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 3.10887e-14 OK.
Coupled point location match (average 0) OK.
Mesh OK.
--> FOAM Warning :
From function virtual Foam::polyMesh::readUpdateState Foam::polyMesh::readUpdate()
in file meshes/polyMesh/polyMeshIO.C at line 209
unexpected consequences. Proceed with care.
Time = 0.001 // snappyHexMesh
Mesh stats
points: 68306
faces: 194580
internal faces: 184620
cells: 63200
faces per cell: 6
boundary patches: 1
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
hexahedra: 63200
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.
Number of regions: 1 (OK).
Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
CAD 9960 9962 ok (closed singly connected)
Checking geometry...
Overall domain bounding box (0 -2 0) (2 0 2)
Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
Mesh has 3 solution (non-empty) directions (1 1 1)
Boundary openness (-1.66453e-16 2.37027e-16 -3.06715e-16) OK.
Max cell openness = 2.77556e-16 OK.
Max aspect ratio = 1 OK.
Minimum face area = 0.0025. Maximum face area = 0.0025. Face area magnitudes OK.
Min volume = 0.000125. Max volume = 0.000125. Total volume = 7.9. Cell volumes OK.
Mesh non-orthogonality Max: 0 average: 0
Non-orthogonality check OK.
Face pyramids OK.
Due to the checkMesh results, i think i "lose" my boundarypatches, at the snappyhexmesh mesh.
I look into the tutorial, but i didnt find a way, or overread it, to transfer the boundarys to the snappyhexmesh.
How can it be done ?
Best regards
Kai |
