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-   -   Periodic and projection problem (http://www.cfd-online.com/Forums/pointwise/125766-periodic-projection-problem.html)

crostolo October 30, 2013 13:40

Periodic and projection problem
 
Hi all,
I have a problem on wich I'm smashing my head for a month. I'm trying to mesh the fluid field around a wing.

I use unstructured mesh. I have create a "wind gallery" of a third of a tube (so with an angle of 120). Then I mesh the surface and create --> periodic --> rotate for the other face.

When I import the cae file into fluent he generates many errors due to incosistent rotation of the periodic domain, in particular when I try to transform it into polyhedra mesh.
The only strange thing I have noticed is that I can't project all the mesh surfaces oh my gemoetry surfaces (in particular the boundary node appears not to be well projected).

Is there someone could help me? Thanks

edit: I add some more info. I have made my geometry on SolidWorks with rotational extrusion for the domain. Here are some imagines, of the domain (a coarse one (external) a fine one and then inside it the wing) and the problem I met. All the faces are not 100% projected and only if I remove the thick from "interior only" i can project 100% my faces.
Then when I try to do ne periodic rotate face it is not 100% projected :/

crostolo October 30, 2013 15:26

2 Attachment(s)
Here are the imagines

dgarlisch October 31, 2013 11:57

I strongly suggest you contact Pointwise support for help on this problem.

If support is not available, you will need to provide more information that just a few images. Attach the pw file along with the exact steps you use to repeat the bug.

It is better if you can repeat the issue in a simple pw file.

tcarrigan November 6, 2013 10:31

That looks very similar to the HAWT case we did a couple years ago. Take a look at this video, it may answer your questions:

http://www.youtube.com/watch?v=KOvWlgBEzo4

crostolo November 23, 2013 14:27

Quote:

Originally Posted by tcarrigan (Post 460847)
That looks very similar to the HAWT case we did a couple years ago. Take a look at this video, it may answer your questions:

http://www.youtube.com/watch?v=KOvWlgBEzo4

Thanks a lot for the video, very useful.
Seems not to resolve my problem with periodic btw.

Seems to be a problem on the code when I import mesh into fluent if I use periodic "feature" of pointwise, so I have resolved my problem simply making mesh of an half of my domain and the mirroring along y axis and it works

dgarlisch November 25, 2013 11:31

Try exporting the grid from Pointwise with some other type of boundary condition on the periodic domains (wall?).

Then inside Fluent, change the BCs back to periodic.

Good luck.


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