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-   -   Pointwise grid export to Openfoam (http://www.cfd-online.com/Forums/openfoam-meshing-other/83582-pointwise-grid-export-openfoam.html)

Eren10 January 4, 2011 11:52

Pointwise grid export to Openfoam
 
Hi,

I want to export the mesh generated with the Pointwise to OpenFoam. How should I do this.

There is three options at the export: Grid , Database or CAE.
I have only generated mesh, after this only the export > Grid is available. I do not see the right export extensions, even for Fluent.

dkingsley January 4, 2011 15:00

Quote:

Originally Posted by Eren10 (Post 289222)
Hi,

I want to export the mesh generated with the Pointwise to OpenFoam. How should I do this.

There is three options at the export: Grid , Database or CAE.
I have only generated mesh, after this only the export > Grid is available. I do not see the right export extensions, even for Fluent.

You will have to build your volume grids in Pointwise and add boundary conditions to the faces before you can export to OpenFOAM using the CAE option.

Dennis

cnsidero January 4, 2011 17:28

@Eren10

I will add to dkingsley's post.

First, be sure to set you CAE type to OpenFOAM (CAE > Select Solver ... OpenFOAM).

Next, like dkingsley said, you have to have a volume mesh complete. As you know OpenFOAM works in 3D all the time so even if you are doing a 2D simulation you must make the grid 3D first.

Then you can set volume conditions on the volume mesh and boundary conditions on the domains.

Once the above steps have been complete, to save you mesh in the native OpenFOAM format, choose File > Export > CAE ... and the choose the folder to save the files.

For your reference, exporting to Grid allows you to save the mesh only in various neutral or generic formats (PLOT3D, NASTRAN, etc) but no volume or boundary conditions. Export to Database allows you to save the geometry only to various neutral or generic formats (DBA, IGES). The last one, Export to CAE allows to save the mesh, the volume and the boundary conditions to the solver you have chosen.

Hope that helps.

Lodda January 10, 2011 03:53

Befor you can export the mesh you have to select all blocks. Then you can export your Volume-Mesh with File -> Export to CAE.

Best regards

Lodda

Eren10 January 10, 2011 07:43

Thank you guys. I have done it. Also it is important for 2D to generate the third dimension only with 1 step.

MDB June 10, 2013 14:49

Pointwise - OpenFOAM
 
I am new with this Pointwise - OpenFOAM interface, but the issues discussed in this thread are well known to me and already overcome. However I am getting very bad results in OpenFOAM and the settings don't look too bad, so I keep questioning the grid generation... Setting the Boundary Conditions (BCs) is pretty straightforward, but when I set Volume Conditions (VCs) I doubt: should I give a specific name so OpenFOAM recognises it?
My case is quite simple and I only have 1 volume which should be fluid (air), so setting all blocks of the mesh as "set" (which is the only option pointwise offers) is the only thing I can do... so how and where does OpenFOAM read these VCs?
Thanks

tobyB August 16, 2013 07:36

You mention building volume condtions. When I tried to this there were no changes to the outputfiles compared to when I only specified bounarys.

How do you specify volume conditions on pointwise and what should the resulting output files looklike?

Thanks

Toby

MDB August 17, 2013 04:48

Dear tobyB,

As far as I have used Pointwise, when exporting to OpenFOAM, it doesn't make any difference whether you specify volume conditions or not. I do not know if it has an implication I might not be aware of, but for how OpenFOAM read the files, specifying volume conditions is not necessary. If you are exporting into OpenFOAM you should get 5 files named boundary, faces, neighbour, owner and points.

Hope this helps,

MDB

tobyB August 19, 2013 05:03

Ah okay then, do you know then how I would use those files in order to define different regions?

I am working of the example: chtMultiRegionSimpleFoam->multiRegionHeater. Which seems to define different regions by using boxToCell and then setToCellZone, highlighting cells within a cuboid shape. Although this is fine for simple examples, I need to define more complex geometries to a specific region.

Would this be possible using some of the boundary conditions that you can export from pointwise, and then using faces to select the cells.
Or should I perhaps export the mesh twice, selecting each block section seperatley, two get two sets of boundary points etc? If so, how would I connect these up?

Thanks,

Toby

cnsidero August 19, 2013 08:55

As MDB said, setting volume conditions for OpenFOAM export does nothing.

tobyB August 19, 2013 11:00

right then, so what do you think the best way of implemeting different cellzones from pointwise meshes would be?

cnsidero August 19, 2013 11:26

Actually, I spoke too quickly. I forgot the ability to export volume conditions as cellZones and cellSets was recently added to Pointwise OpenFOAM exporter. If you grab the latest release candidate, it has this capability:

http://www.pointwise.com/support/dload_rc.shtml

What the volume condition writes out is controlled by the solver attributes found in CAE, Set Solver Attributes.

-Chris

tobyB August 19, 2013 12:01

which version are you talking about specifically?
I just got 17.1 R3, does it have to be C4 too? If this works then it will be a great help.

tobyB August 19, 2013 12:37

Ok, ive only tried it briefly but the new version (not just R4) did give me some good results. Ill try tommorow to encorperate them into an existing case. Thanks alot cnsidero.

Toby


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