| assert |
April 15, 2014 08:04 |
Upper-triangular order in detail
Quote:
Simply said upper-triangular order is that the order of faces corresponds to the order of the cells they connect.
- take all (higher numbered) cells connected to a cell.
- sort them according to their cell label
- the faces connecting to those cells should now also be ordered.
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Although this answer appeared clear to me, when I implement it, checkMesh keeps giving me the error 'Faces not in upper triangular order'.
Trying to following the advice, I:
- partitioned the faces within their boundary type
- ordered these faces (within their boundary type) by the index of the Cell that owns them
upperTriangularFace indicates that face 0 is incorrect, where it is the only face in its boundary. How can this be incorrectly ordered?
All files and output (and future solution) can be found at
https://github.com/richelbilderbeek/...eek/issues/181 , yet I also put the files here.
Trace of the faces used, the name of their boundary type and the index of the cell that owns the face:
Code:
#Face index - Boundary type - Index of Cell owning the Face
TRACE 's.str()' line 174 in file '..\..\Classes\CppTriangleMesh\trianglemeshbuilder.cpp': '0: inside: 1'
TRACE 's.str()' line 174 in file '..\..\Classes\CppTriangleMesh\trianglemeshbuilder.cpp': '1: top: 0'
TRACE 's.str()' line 174 in file '..\..\Classes\CppTriangleMesh\trianglemeshbuilder.cpp': '2: top: 1'
TRACE 's.str()' line 174 in file '..\..\Classes\CppTriangleMesh\trianglemeshbuilder.cpp': '3: right: 0'
TRACE 's.str()' line 174 in file '..\..\Classes\CppTriangleMesh\trianglemeshbuilder.cpp': '4: left: 0'
TRACE 's.str()' line 174 in file '..\..\Classes\CppTriangleMesh\trianglemeshbuilder.cpp': '5: front: 1'
TRACE 's.str()' line 174 in file '..\..\Classes\CppTriangleMesh\trianglemeshbuilder.cpp': '6: bottom: 0'
TRACE 's.str()' line 174 in file '..\..\Classes\CppTriangleMesh\trianglemeshbuilder.cpp': '7: bottom: 1'
TRACE 's.str()' line 174 in file '..\..\Classes\CppTriangleMesh\trianglemeshbuilder.cpp': '8: back: 1'
checkMesh output:
Code:
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
/* Windows 32 and 64 bit porting by blueCAPE: http://www.bluecape.com.pt *\
| Based on Windows porting (2.0.x v4) by Symscape: http://www.symscape.com |
\*---------------------------------------------------------------------------*/
Build : 2.1-88b2f2ae3a0b
Exec : checkMesh
Date : Apr 15 2014
Time : 13:41:22
Host : "AIRBEAR-W7-I5"
PID : 5668
Case : D:/Projects/Tools/build-ToolTestTriangleMeshConsole-Desktop_Qt_5_1_1_MinGW_32bit-Debug
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
Time = 0
Mesh stats
points: 8
internal points: 0
faces: 9
internal faces: 1
cells: 2
boundary patches: 6
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
hexahedra: 0
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 2
Checking topology...
Boundary definition OK.
Cell to face addressing OK.
Point usage OK.
***Faces not in upper triangular order.
<<Writing 1 unordered faces to set upperTriangularFace
Face vertices OK.
Number of regions: 1 (OK).
Checking patch topology for multiply connected surfaces ...
Patch Faces Points Surface topology
top 2 4 ok (non-closed singly connected)
right 1 4 ok (non-closed singly connected)
left 1 4 ok (non-closed singly connected)
front 1 4 ok (non-closed singly connected)
bottom 2 4 ok (non-closed singly connected)
back 1 4 ok (non-closed singly connected)
Checking geometry...
Overall domain bounding box (-0.92388 -0.92388 1) (0.92388 0.92388 2)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (0 1.14967e-017 0) OK.
***Open cells found, max cell openness: 1, number of open cells 2
<<Writing 2 non closed cells to set nonClosedCells
Minimum face area = 1. Maximum face area = 2. Face area magnitudes OK.
Min volume = 0.777778. Max volume = 0.777778. Total volume = 1.55556. Cell volumes OK.
Mesh non-orthogonality Max: 180 average: 180
***Number of non-orthogonality errors: 1.
<<Writing 1 non-orthogonal faces to set nonOrthoFaces
***Error in face pyramids: 2 faces are incorrectly oriented.
<<Writing 1 faces with incorrect orientation to set wrongOrientedFaces
Max skewness = 0.404762 OK.
Coupled point location match (average 0) OK.
Failed 4 mesh checks.
End
upperTriangularFace:
Code:
FoamFile
{
version 2.0;
format ascii;
class faceSet;
location "constant/polyMesh/sets";
object upperTriangularFace;
}
1
(
0
)
points:
Code:
FoamFile
{ version 2.0;
format ascii;
class vectorField;
location "constant/polyMesh";
object points;
}
8
(
(-0.92388000000000003 -0.382683 1)
(-0.92388000000000003 -0.382683 2)
(-0.382683 0.92388000000000003 1)
(-0.382683 0.92388000000000003 2)
(0.382683 -0.92388000000000003 1)
(0.382683 -0.92388000000000003 2)
(0.92388000000000003 0.382683 1)
(0.92388000000000003 0.382683 2)
)
faces:
Code:
FoamFile
{ version 2.0;
format ascii;
class faceList;
location "constant/polyMesh";
object faces;
}
9
(
4(2 4 5 3)
3(5 7 3)
3(3 1 5)
4(2 3 7 6)
4(4 6 7 5)
4(0 4 5 1)
3(2 6 4)
3(4 0 2)
4(0 1 3 2)
)
boundary:
Code:
FoamFile
{
version 2.0;
format ascii;
class polyBoundaryMesh;
location "constant\polyMesh";
object boundary;
}
6
(
top
{
type zeroGradient;
nFaces 2;
startFace 1;
}
right
{
type zeroGradient;
nFaces 1;
startFace 3;
}
left
{
type zeroGradient;
nFaces 1;
startFace 4;
}
front
{
type zeroGradient;
nFaces 1;
startFace 5;
}
bottom
{
type zeroGradient;
nFaces 2;
startFace 6;
}
back
{
type zeroGradient;
nFaces 1;
startFace 8;
}
)
owner:
Code:
FoamFile
{ version 2.0;
format ascii;
class labelList;
note "nPoints: 8 nCells: 2 nFaces: 9";
location "constant/polyMesh";
object owner;
}
9
(
1
0
1
0
0
1
0
1
1
)
neighbour:
Code:
FoamFile
{ version 2.0;
format ascii;
class labelList;
note "nPoints: 8 nCells: 2 nFaces: 9";
location "constant/polyMesh";
object neighbour;
}
9
(
0
-1
-1
-1
-1
-1
-1
-1
-1
)
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