CFD Online Discussion Forums

CFD Online Discussion Forums (
-   Pointwise & Gridgen (
-   -   Periodic and projection problem (

crostolo October 30, 2013 12:40

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 14:26

2 Attachment(s)
Here are the imagines

dgarlisch October 31, 2013 10:57

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:

crostolo November 23, 2013 14:27


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:

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.

All times are GMT -4. The time now is 20:39.