[hsieh]

Hi, Mr. Gruber,

I believe that the latest netgenToFoam converter is part of OpenFOAM-1.1. Did you try it?

Pei

[billy]

Hello,

Try command:

netgenNeutralToFoam

source code in:

$HOME/OpenFOAM/OpenFOAM-1.1/applications/utilities/mesh/conversion/netgenNeutral ToFoam

[gruber2]

You are right ! Thank you for your help.

[gruber2]

I post a short guide at the OpenFoam Wiki for importing a Netgen-Mesh.
http://openfoamwiki.net/index.php/NetgenNeutralTo Foam

[gruber2]

sorry, here's the right Link:
http://openfoamwiki.net/index.php/NetgenNeutralTo Foam

[fiona]

Originally Posted by Pei-Ying Hsieh (Hsieh)

HI,

I think Netgen is the best tool because the latest version can import STEP format. IGES format is somewhat problematic. Another good thing about Netgen is that "it is open source". I have not played with it enough. I do not know how good its mesh control is (dense elements in one area and coarse elements in other areas).

Pei

Hi,

Netgen seems working fine except when trying to load geometry (File->Load geometry) inside GUI. It pops up an error message "Bad option "-typevariable": must be -degaultextension, -filetypes, -initialdir, -initialfile, -multiple, -parent, or -title".

It works if I type netgen -g <filename> at command prompt line.

Also, can anybody tell me what the commandline options I should use to import STEP file into Netgen? Opencascade is already installed.

Thanks,

Fiona

[philippose]

Hello Fiona,

A Good Evening to you!

Its odd that you are having this problem with Netgen.... Which version of Netgen are you currently using? We recently released Netgen-4.9.12 on the Sourceforge project site....

I strongly suggest that you upgrade to the latest version, as far as I can remember, the problem that you seem to have was present in one of the very old versions.

Have a nice day!

Philippose

[fiona]

Hi Phillippose,

Thank you for your quick reply.

It is the latest version of Netgen-4.9.12. It was installed on Ubuntu 9.10 64bit with tcl8.4.19, tk8.4.19, tix-8.1.4 and togl-1.7.

Fiona

[shirazbj]

I am interested in doing stress anlysis by using solidDisplacementFoam while import geometry from a STL file. Thinking using SketchUP to make a simple 3D model and export as the STL file.

STL inludes vertix and faces. I need to pick up a loction to define the force applied. How do I set the boundary condition? Is there any example like this?

Thanks

Cean

[gocarts]

STL is a surface-based polygon (triangle) format, whereas you need a volume mesh to perform OpenFOAM simulations.

You might be able to create a volume mesh with snappyHexMesh (SHM) using your STL representation as the the input - but I'm not a SHM expert.

[shirazbj]

I have tried to model with SketchUp and export as STL. Then input the STL into gmesh. After define a volumn, I got the 3D mesh. Will try to use it under OF. First I thought I need to use gmeshToFoam, but not sure if I need to edit some dictionary files.

Thanks

[gocarts]

If you haven't already I suggest you read the chapter "2.2 Stress analysis of a plate with a hole" in the OpenFOAM UserGuilde.pdf as a lead in to what you are attempting to simulate. I would also suggest that you work through this stress example rather than just read it.

You will need to convert your gmsh file to OpenFOAM using gmshToFoam and you'll also need to group (separate) boundary mesh faces so you can apply boundary conditions through the dictionary files you mentioned.

Hope this helps.

[Azadeh90]

This problem is due to setting the wrong directrory line you should write for example:
cd ~/OpenFoam/openfoam-1.6/tutorials/incompressible/icoFoam

and then enter, and then write your command.
Good Luck with your work

[JoergPalluch]

The software CAESES is able to import STEP files, and comes with pre-processing capabilities for STL preparation in the context of OpenFOAM.

Here is a short tutorial video about creating a closed triangulation and coloring the patches.

In the video section, there is also a more comprehensive webinar video about "CAESES as a GUI for OpenFOAM".

Hope this helps,
Joerg

[alixcattermole]

I am trying to convert a netgen mesh into openfoam but whenever I use the netgenNeutralToFoam [filename.neutral] command I get and error in openfoam saying FOAM FATAL IO ERROR: cannot find file.
Any ideas at how I can get around this.

Thanks.