| AlmostSurelyRob |
December 7, 2010 13:01 |
channelFoam for a 3D pipe
1 Attachment(s)
Dear All,
I would value your advice on the case I am trying to set up. Basically I wish to adapt channelFoam tutorial to a certain type of 3D pipeline mesh. (see attached).
I believe I have already sorted out the meshing. However blockMesh still gives me an output with warnings about negative volumes.
Code:
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.7.1 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 1.7.1-03e7e056c215
Exec : blockMesh
Date : Dec 07 2010
Time : 17:44:19
Host : soli31888c
PID : 28450
Case : /home/c111269/OpenFOAM/c111269-1.7.1/cases
nProcs : 1
SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Creating block mesh from
"/home/c111269/OpenFOAM/c111269-1.7.1/cases/constant/polyMesh/blockMeshDict"
Creating blockCorners
Creating curved edges
Creating blocks
Creating patches
Creating block mesh topology
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.666667 for face 0
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.666667 for face 1
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.666667 for face 2
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.666667 for face 3
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.666667 for face 4
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.666667 for face 5
--> FOAM Warning :
From function blockMesh::createTopology(IOdictionary&)
in file createTopology.C at line 397
negative volume block : 0, probably defined inside-out
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 0
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 1
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 2
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 3
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.333333 for face 4
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.666667 for face 5
--> FOAM Warning :
From function blockMesh::createTopology(IOdictionary&)
in file createTopology.C at line 397
negative volume block : 1, probably defined inside-out
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 0
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 1
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 2
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 3
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.333333 for face 4
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.666667 for face 5
--> FOAM Warning :
From function blockMesh::createTopology(IOdictionary&)
in file createTopology.C at line 397
negative volume block : 2, probably defined inside-out
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 0
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 1
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 2
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 3
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.333333 for face 4
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.666667 for face 5
--> FOAM Warning :
From function blockMesh::createTopology(IOdictionary&)
in file createTopology.C at line 397
negative volume block : 3, probably defined inside-out
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 0
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 1
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 2
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.5 for face 3
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.333333 for face 4
--> FOAM Warning :
From function cellModel::mag(const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.C at line 128
zero or negative pyramid volume: -0.666667 for face 5
--> FOAM Warning :
From function blockMesh::createTopology(IOdictionary&)
in file createTopology.C at line 397
negative volume block : 4, probably defined inside-out
Default patch type set to empty
Check block mesh topology
Basic statistics
Number of internal faces : 8
Number of boundary faces : 14
Number of defined boundary faces : 14
Number of undefined boundary faces : 0
Checking patch -> block consistency
Creating block offsets
Creating merge list .
Creating points with scale 1
Creating cells
Creating patches
Creating mesh from block mesh
Default patch type set to empty
Writing polyMesh
End
I construct this mesh by creating the cube in the centre, adding the surrounding edges and than creating blocks for each section. Please, note that the number of outer and internal faces is correct.
Here's my blockMeshDict:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.7.1 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
convertToMeters 1;
vertices
(
//internal square
(0 -1 -1) //0
(1 -1 -1) //1
(1 -1 1) //2
(0 -1 1) //3
(0 1 -1) //4
(1 1 -1) //5
(1 1 1) //6
(0 1 1) //7
//Going clockwise with sections
//North section
(0 2 2) //8
(0 -2 2) //9
(1 2 2) //10
(1 -2 2) //11
//East section
(0 2 -2) //12
(1 2 -2) //13
//South section
(0 -2 -2) //14
(1 -2 -2) //15
);
edges
(
//North section
arc 8 9 (0 0 2.82)
arc 10 11 (1 0 2.82)
//East section
arc 8 12 (0 2.82 0)
arc 10 13 (1 2.82 0)
//South section
arc 12 14 (0 0 -2.82 )
arc 13 15 (1 0 -2.82 )
//West section
arc 14 9 (0 -2.82 0)
arc 15 11 (1 -2.82 0)
);
blocks
(
//Centre
hex (0 1 2 3 4 5 6 7) (32 48 48) simpleGrading (1 1 1)
//East section
hex (7 6 2 3 8 10 11 9) (32 48 92) simpleGrading (1 1 0.25)
//East section
hex (4 5 6 7 12 13 10 8) (32 48 92) simpleGrading (1 1 0.25)
//South section
hex (0 1 5 4 14 15 13 12) (32 48 92) simpleGrading (1 1 0.25)
//West section
hex (3 2 1 0 9 11 15 14) (32 48 92) simpleGrading (1 1 0.25)
);
patches
(
wall pipeWall
(
(9 11 10 8)
(8 10 13 12)
(12 14 15 13)
(14 9 11 15)
)
cyclic cNorth
(
(9 3 7 8)
(11 2 6 10)
)
cyclic cEast
(
(7 4 12 8)
(6 5 13 10)
)
cyclic cSouth
(
(0 14 12 4)
(1 5 13 15)
)
cyclic cWest
(
(0 14 9 3)
(1 15 11 2)
)
cyclic cCentre
(
(0 4 7 3)
(1 2 6 5)
)
);
mergePatchPairs
(
);
// ************************************************************************* //
After setting up all other dictionaries, running channelFoam results in an error:
Code:
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.7.1 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 1.7.1-03e7e056c215
Exec : channelFoam
Date : Dec 07 2010
Time : 17:46:09
Host : soli31888c
PID : 28478
Case : /home/c111269/OpenFOAM/c111269-1.7.1/cases
nProcs : 1
SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Create mesh for time = 0
Reading transportProperties
Reading field p
Reading field U
Reading/calculating face flux field phi
Selecting incompressible transport model Newtonian
Selecting LES turbulence model oneEqEddy
oneEqEddyCoeffs
{
ce 1.048;
ck 0.094;
}
Initializing with 0 pressure gradient
Starting time loop
Reading/calculating field UMean
Reading/calculating field pMean
Reading/calculating field UPrime2Mean
Reading/calculating field pPrime2Mean
fieldAverage: starting averaging at time 0
Time = 0.02
Courant Number mean: 0.519785 max: 1.7088
#0 Foam::error::printStack(Foam::Ostream&) in "/home/c111269/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOAM.so"
#1 Foam::sigFpe::sigFpeHandler(int) in "/home/c111269/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOAM.so"
#2 in "/lib64/libc.so.6"
#3 void Foam::magSqr<Foam::SymmTensor<double>, Foam::fvPatchField, Foam::volMesh>(Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&, Foam::GeometricField<Foam::SymmTensor<double>, Foam::fvPatchField, Foam::volMesh> const&) in "/home/c111269/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libincompressibleLESModels.so"
#4 Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam::magSqr<Foam::SymmTensor<double>, Foam::fvPatchField, Foam::volMesh>(Foam::tmp<Foam::GeometricField<Foam::SymmTensor<double>, Foam::fvPatchField, Foam::volMesh> > const&) in "/home/c111269/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libincompressibleLESModels.so"
#5 Foam::incompressible::LESModels::oneEqEddy::correct(Foam::tmp<Foam::GeometricField<Foam::Tensor<double>, Foam::fvPatchField, Foam::volMesh> > const&) in "/home/c111269/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libincompressibleLESModels.so"
#6 Foam::incompressible::LESModel::correct() in "/home/c111269/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libincompressibleLESModels.so"
#7
in "/home/c111269/OpenFOAM/OpenFOAM-1.7.1/applications/bin/linux64GccDPOpt/channelFoam"
#8 __libc_start_main in "/lib64/libc.so.6"
#9
at /usr/src/packages/BUILD/glibc-2.11.2/csu/../sysdeps/x86_64/elf/start.S:116
Floating point exception
which I guess means that it's diverging.
My questions are
1) Can I run channelFoam for any other geometry than channel?
2) Why do I get warnings about negative volumes?
3) Do I have to specify each cyclic patch separately?
Please let me know if you know of any other references on running 3D pipeline simulation in openFoam with cyclic boundary conditions. It would be great if you could advise me if I am on the right track at least with setting up my case.
Many thanks,
Robert |
