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Converting a 2Dmesh to axisymmetric

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Old   April 12, 2010, 08:40
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Sebastian Gatzka
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Quote:
Originally Posted by Javed View Post
Thanks, but after correcting it i m getting following error
You can't use a wedge type on a non-wedge mesh.
Alter your points so they will form the wedge and than you can use the wedge type.
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Old   April 12, 2010, 08:57
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Sir, I wil be grateful if u explain in details, how to form wedge from the given points?
Thanks
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Old   April 12, 2010, 08:59
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Quote:
Originally Posted by Javed View Post
Sir, I wil be grateful if u explain in details, how to form wedge from the given points?
Thanks
Have a look at the user guide.
http://www.openfoam.com/docs/user/bo...hp#x24-1370014
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Old   April 12, 2010, 13:17
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Quote:
Originally Posted by Javed View Post
Hi Bernhard,

I am trying to generate axisymmetric geom with the following blockMeshDict file:
convertToMeters 0.1;

<snip>

ill defined primitiveEntry starting at keyword 'patches' on line 41 and ending at line 70

file: /home/javed/OpenFOAM/javed-1.6/run/wedge/constant/polyMesh/blockMeshDict at line 70.

From function primitiveEntry::readEntry(const dictionary&, Istream&)
in file db/dictionary/primitiveEntry/primitiveEntryIO.C at line 210.

FOAM exiting


PLEASE HELP.
This is NOT a problem with the utility this thread is about. I won't answer further unrelated questions.

There is a '(' missing at "empty center". Use a text editor that displays matching Parenthesis (Emacs for instance) that helps to spot such problems
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Old   April 13, 2010, 03:59
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Sir,,

I am sorry for disturbing u in another thread.
I didn't get anyother thread where i can put my query regarding axisymmetric geometry.
It will be great if u plz let help me for the following pbm..
I have developed the axisymmetric pbm with follwoing blockMesh file..
blocks
(
hex (0 1 2 3 0 1 6 7) (20 20 1) simpleGrading (1 1 1)
);

edges
(
);

patches
(
wall fixed
(
(3 7 6 2)
)
patch inlet
(
(0 0 7 3)
)
patch outlet
(
(2 6 1 1)
)
empty center
(
(1 1 0 0)
)
wedge front
(
(0 3 2 1)
)
wedge back
(
(0 1 6 7)
)
);

but getting follwoing error..
Creating block mesh from
"/home/javed/OpenFOAM/javed-1.6/run/wedge-new/constant/polyMesh/blockMeshDict"


Creating blockCorners

Creating curved edges

Creating blocks

Creating patches

Creating block mesh topology

Default patch type set to empty
#0 Foam::error:rintStack(Foam::Ostream&) in "/home/javed/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libOpenFOAM.so"
#1 Foam::sigFpe::sigFpeHandler(int) in "/home/javed/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libOpenFOAM.so"
#2 Uninterpreted:
#3 Foam::wedgePolyPatch::initTransforms() in "/home/javed/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libOpenFOAM.so"
#4 Foam::wedgePolyPatch::wedgePolyPatch(Foam::word const&, int, int, int, Foam:olyBoundaryMesh const&) in "/home/javed/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libOpenFOAM.so"
#5 Foam:olyPatch::addwordConstructorToTable<Foam::w edgePolyPatch>::New(Foam::word const&, int, int, int, Foam:olyBoundaryMesh const&) in "/home/javed/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libOpenFOAM.so"
#6 Foam:olyPatch::New(Foam::word const&, Foam::word const&, int, int, int, Foam:olyBoundaryMesh const&) in "/home/javed/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libOpenFOAM.so"
#7 Foam:olyMesh:olyMesh(Foam::IOobject const&, Foam::Xfer<Foam::Field<Foam::Vector<double> > > const&, Foam::List<Foam::cellShape> const&, Foam::List<Foam::List<Foam::face> > const&, Foam::List<Foam::word> const&, Foam::List<Foam::word> const&, Foam::word const&, Foam::word const&, Foam::List<Foam::word> const&, bool) in "/home/javed/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libOpenFOAM.so"
#8 Foam::blockMesh::createTopology(Foam::IOdictionary &) in "/home/javed/OpenFOAM/OpenFOAM-1.6/applications/bin/linuxGccDPOpt/blockMesh"
#9 Foam::blockMesh::blockMesh(Foam::IOdictionary&) in "/home/javed/OpenFOAM/OpenFOAM-1.6/applications/bin/linuxGccDPOpt/blockMesh"
#10 main in "/home/javed/OpenFOAM/OpenFOAM-1.6/applications/bin/linuxGccDPOpt/blockMesh"
#11 __libc_start_main in "/lib/tls/i686/cmov/libc.so.6"
#12 _start at /usr/src/packages/BUILD/glibc-2.9/csu/../sysdeps/i386/elf/start.S:122
Floating point exception
..

Thanks for the help...
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Old   April 13, 2010, 05:21
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Quote:
Originally Posted by Javed View Post
I didn't get anyother thread where i can put my query regarding axisymmetric geometry.
Open you own.
We have misused this thread.
Sorry
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Old   April 29, 2010, 02:21
Question checkMesh Error when using "axis offset"
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Dear Foamers,
I'd like to resume this thread and come back to the checkMesh error "Failed 1 mesh checks" which had been previously reported with cases where the axis is not aligned with the patch (axis offset feature). For example:
----------
***Number of edges not aligned with or perpendicular to non-empty directions: 96154
<<Writing 74460 points on non-aligned edges to set nonAlignedEdges
----------
I've got the same problem with a concentric cylinder set-up where the inner cylinder rotates and the outer is fixed (Taylor-Couette system with fluid-filled ring gap).
Do we have to use the collapseEdges utility with such cases (in my case collapseEdges doesn't seem to do anything and the checkMesh issue persists), or can the mesh be used "as is" after using makeAxialMesh??
I'd greatly appreciate any help!
Have a nice day
Bengt
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Old   July 14, 2010, 11:55
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I don't think that MakeAxialMesh works with openFOam 1.7.

I have to simulate a barrel of a gun, as you can see in screen shots (attachments), i have one cell thick in y i direction, but in my boundary file i don't see how to define a wedge, SO has an idea, help plzz
13
(
tube5
{
type wall;
nFaces 30;
startFace 60334;
}
tube4
{
type wall;
nFaces 3;
startFace 60364;
}
FREIN3
{
type wall;
nFaces 70;
startFace 60367;
}
FREIN2
{
type wall;
nFaces 15;
startFace 60437;
}
FREIN1
{
type wall;
nFaces 30;
startFace 60452;
}
Frein
{
type wall;
nFaces 20;
startFace 60482;
}
Pressure_inlet
{
type patch;
nFaces 30;
startFace 60502;
}
Tube3
{
type wall;
nFaces 21;
startFace 60532;
}
Tube2
{
type wall;
nFaces 10;
startFace 60553;
}
Tube1
{
type wall;
nFaces 139;
startFace 60563;
}
Axe
{
type symmetryPlane;
nFaces 215;
startFace 60702;
}
Pressure_outlet
{
type patch;
nFaces 209;
startFace 60917;
}
frontAndBackPlanes
{
type empty;
nFaces 60730;
startFace 61126;
}
)
Attached Images
File Type: jpg 1.jpg (38.3 KB, 63 views)
File Type: jpg 2.jpg (48.9 KB, 59 views)
File Type: jpg 3.jpg (11.2 KB, 47 views)
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Old   July 14, 2010, 17:25
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Greetings,

Help please, you can see my problem here (7th post)
*.msh conversion + axissymetric problem


Abdel.
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Old   July 29, 2010, 09:00
Default Simulation results
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Hi all

First of all thanks to Bernhard for the great utility.

Have have been using it a bit in order to get a 2D axisymmetrc simulation running. I started off with the example included in the utility, and modified it a bit. I added an outlet, and added a slight inflow into the domain. The model is based on this concept:




Flow enters the domain tangentially and exits axially. The flow is thus axisymmetric, and I'm just modelling a section of it.

I'm using the IcoFoam solver, and the solution converges well. However, the results don't look right. See below:



It seems the flow is exiting the domain with almost no swirl. It also seems the inlet swirl is quickly dissipated. I'm quite sure this is not correct, since there is quite a lot of angular momentum introduced at the inlet, and this momentum must be conserved. I would expect the outlet flow to still have a lot of swirl.

Can anybody suggest any ideas?

Last edited by bernarde; July 30, 2010 at 03:25.
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Old   August 3, 2010, 09:53
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Quote:
Originally Posted by bernarde View Post
Hi all

It seems the flow is exiting the domain with almost no swirl. It also seems the inlet swirl is quickly dissipated. I'm quite sure this is not correct, since there is quite a lot of angular momentum introduced at the inlet, and this momentum must be conserved. I would expect the outlet flow to still have a lot of swirl.

Can anybody suggest any ideas?
Have you checked whether what paraFoam shows you is consistent with what is on the disk. At least for older versions (havn't done wedges since) for glyphs the component "out of the wedge" was removed. What you had to do was use the "Cell Centers"-filter (then you saw nothing) and for that result use "Glyphs" (due to the small picture I'm not 100% sure whether there is a flow "out of the wedge" outside of the Inlet, so this might be not too helpful)

Bernhard
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Old   December 5, 2010, 23:58
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Hi Bengt,
I've run in to this same issue as well. I'm beginning to think that this is an accepted issue. If you look at the tutorial ~/OpenFOAM/sunny-1.6.x/run/tutorials/multiphase/interFoam/les/nozzleFlow2D which also uses an axisymmetric mesh, the same error shows up when you run checkMesh. Whether or not that makes it OK, I'm not sure, but at least it is clear that the provided tutorials have the same issue.

Sunny
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Old   December 10, 2010, 10:22
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hi,

is there a solution for the problem by which makeAxialMesh isn┤t running if there are any libs or functions in the controlDict?

Regarding the groovyBC and the simpleFunctionObjects...

neewbie
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Old   December 14, 2010, 05:44
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Quote:
Originally Posted by neewbie View Post
hi,

is there a solution for the problem by which makeAxialMesh isn┤t running if there are any libs or functions in the controlDict?

Regarding the groovyBC and the simpleFunctionObjects...

neewbie
The problem is that makeAxialMesh only loads the mesh as a polyMesh (it doesn't need more for what it has been doing) while most functionObjects need a fvMesh. The quickest solution is to go to the controlDict, comment out the functions and the libs entry, run MAM and then restore the controlDict to its old glory. Or if you have pyFoam installed run it like this

pyFoamRunner.py --remove-libs --remove-functions makeAxialMesh

which does the editing/restoring for you.

OR there is the possibility to turn of the functionObjects in the source code of the utility (but I'll have to look that up, maybe will do it, but you'll probably need a solution right now)

Bernhard
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Old   December 14, 2010, 05:47
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thanks,

this is exactly as i did.
Some mv and cp in a startscript did the job.

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Old   January 4, 2011, 12:37
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btw...
can makeAxialMesh be used for multipleRegion meshes?

neewbie
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Old   January 5, 2011, 04:02
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sorry...
i┤ve started a new thread on this...
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Old   February 11, 2011, 17:32
Default does this work for foam 1.7
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I have been trying to make axisymmetric geometry the documentation says this utility is for V1.4 and 1.5. I am using V1.7. has anyone tried this in 1.7 before I put too much effort into altering my geometry.
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Old   June 30, 2011, 19:16
Default conversion 2Dmesh to axisymmetric
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Hi everyone,

I imported my mesh (generate in fluent) file to a FOAM mesh successfully using fluentMeshToFoam command.

and I would Converting a 2Dmesh to axisymmetric, I downlowd the makeAxialMesh and it's compiling successfuly.
my question:What are the other commands to perform the conversion?
I found the answer in a forum on the link, but it's removed"Contrib MakeAxialMesh - OpenFOAMWiki"
I work OpenFoam 1.7.1 under UBUNTO
thank you for your help
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Old   July 1, 2011, 00:32
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Quote:
Originally Posted by louiza View Post
Hi everyone,

I imported my mesh (generate in fluent) file to a FOAM mesh successfully using fluentMeshToFoam command.

and I would Converting a 2Dmesh to axisymmetric, I downlowd the makeAxialMesh and it's compiling successfuly.
my question:What are the other commands to perform the conversion?
I found the answer in a forum on the link, but it's removed"Contrib MakeAxialMesh - OpenFOAMWiki"
I work OpenFoam 1.7.1 under UBUNTO
thank you for your help
What do you mean with "it's removed". Don't know the posing you're referring to, but checking with
http://lmgtfy.com/?q=openfoamwiki+makeaxialmesh&l=1
gives the right page

Bernhard
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