hi everybody

i would like to create an axi-symmetric case

i have create my 3d mesh with the 5° with the mesh generator Salome.
i have create group of faces for the boundaries(2 wedge,wall,inlet,outlet....) and groups of edge for the axis
I export it to unv format
When i do the conversion to OF format
it recognize the face group but not the edge group

how can i do to have my boundary axis in OpenFOAM?

best regards

[bannari]

Hi,
This can help you
http://openfoamwiki.net/index.php/Contrib_MakeAxialMesh
Best regards

hi

i have follow http://openfoamwiki.net/index.php/Contrib_MakeAxialMesh

but i 've got this error

~/> makeAxialMesh /home/gui/Desktop/ plan axe frontback

Create mesh for time = 0

Plane of the grid: (0 0 1) (52.5 -122 2.5)

The rotation-axis: ((0 0 2.5) (0 -220 2.5))

Creating wedge with an opening angle of 5 degrees

Radius to axis: min = 2.5 max = 105.03
Splitting patch frontback

Copying patches
Creating Patches
Creating Pos-patch
Creating Neg-patch
Changing patches



--> FOAM FATAL ERROR : Cannot change patches after having changed faces.
Please call changePatches first.

From function repatchPolyTopoChanger::changePatches(const List<polypatch*>&)
in file polyTopoChange/repatchPolyTopoChanger/repatchPolyTopoChanger.C at line 72.


To change the patch is not the aim of the make AxialMESH?i've got to change the patch first?

best regards

[gschaider]

You're using it on a 1.4+-installation? I'm surprised that the sources (which were written for 1.3) compile on that. Some of the underlying semantics changed as Mattijs pointed out to me. I will fix that and publish a new version (hopefully next week)

Bernhard

[schmidt_d]

Hi All,
I modified Bernhard's 1.3 version of make axial mesh so that it works with 1.4 and 1.4.1. It probably could have been done better, but here is what I did:

Since OF 1.4 and later, you must have the axisymmetric domain centered on the z=0 plane. The 1.3 version of makeAxialMesh made a copy of the 2D mesh that is rotated by five degrees. My change is to make the copy so that it is rotated from the xy plane by +2.5 degrees and then rotate the original by -2.5 degrees. You still get a 5 deg. wedge.

See the update at:
http://openfoamwiki.net/index.php/Contrib_MakeAxialMesh

It has worked for me. However, RENAUD Guillaume above, may still have problems. I don't see what causes his error.

-David Schmidt

[gschaider]

Extending the definition of "next week" (see above) to "next year" I managed to clean up my internal versiion, incorporate David's suggestions and put it on of-extend (see http://openfoamwiki.net/index.php/Contrib_MakeAxialMesh )

Bernhard

[schmidt_d]

When changing to the OF 1.4.1 hosted on the Subversion site (the tagged version that is the OpenCFD release of 1.4.1 plus bug fixes) I encountered the same error message that Renaud encountered. I took the error message at face value and modified the makeAxialMesh code to call changePatches first. All seems well and the latest code is listed as the 1.4.1 version on

http://openfoamwiki.net/index.php/Contrib_MakeAxialMesh

[bonzodeb]

Hi all!
I don't understand how collapseEdges work.

I use makeAxialMesh without errors.

At the end it says that I must use collapseEdges to clean the grid.

collapseEdges expected 4 arguments
<edge> is refers to which edge lenght??The edge of the axial patch that have zero area??
<merge> angle of what??

Can somebody help me or give me a link that can help me??

For example in my case the blockMesh before makeAxialeMesh is that:

convertToMeters 1;

vertices
(
(0 0 -0.05)
(100 0 -0.05)
(100 0.5 -0.05)
(0 0.5 -0.05)
(0 0 0.05)
(100 0 0.05)
(100 0.5 0.05)
(0 0.5 0.05)
);

blocks
(
hex (0 1 2 3 4 5 6 7) (100 10 1) simpleGrading (1 1 1)
);

edges
(
);

patches
(
patch inlet
(
(0 4 7 3)
)

patch outlet
(
(2 6 5 1)

)
wall pipe
(
(3 7 6 2)
)

empty axis
(
(1 5 4 0)
)
empty frontAndBack
(
(0 3 2 1)
(4 5 6 7)
)
);

mergePatchPairs
(
);


// ************************************************** *********************** //

what edge lenght and merge angle can I use in collapseEdges utility?

Simone