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-   -   [ICEM] Problem with a nozzle and ambient volume (http://www.cfd-online.com/Forums/ansys-meshing/110572-problem-nozzle-ambient-volume.html)

Davide_sd December 14, 2012 07:43

Problem with a nozzle and ambient volume
 
Hi all,
i'm trying to mesh a nozzle connected to an ambient volume; you can see the geometry pic attached. The nozzle have a small injector connected in the divergent. In the pics you can see the actual blocking and the premesh.
I have managed to mesh the nozzle correctly using an O-grid, but i'm not able to mesh correctly the front faces of the ambient volume; as you can see in the premesh pic, i have several distorsion. Is there a way to mesh the front faces?

Thank you!

Geometry: http://s18.postimage.org/ibdnm9d5l/Geometry_post.jpg
Blocking: http://s14.postimage.org/97uuwklqp/Blocking.jpg
Premesh: http://s12.postimage.org/3pk3zk0bx/Premesh_post.jpg

energy382 December 14, 2012 08:26

It's always difficult to give a good advice without .tin and .blk-files. So it would be very helpful, if you could supply them.

But one for sure: you've to insert another o-grid to resolve circular shape of the outer volume.

I can't see the details, you're talking about on your pics. So please supply the files or give us some more detailled pics.

Regards Christoph

Davide_sd December 14, 2012 09:02

1 Attachment(s)
here is the file.
thank you for the help!

Far December 14, 2012 10:54

You have problems in the outer volume and in the injector. I tried to make the o-grid but unsuccessful.

Far December 14, 2012 13:18

5 Attachment(s)
Some advance blocking techniques were needed to get this mesh.

Like creating three o-blocking, deleting few blocks permanently and few without permanent option. Deleted middle o-block, merged vertices, some were not merged. Extrude along curves option was also used.

You can further improve quality by adjusting edge mesh parameters and vertices.

Davide_sd December 15, 2012 05:40

you've done an amazing work here, thank you very much for the help!!!
i'll try to replicate your work; in case of problems, i'll ask here for some advice.
thank you again! =)

Far December 15, 2012 06:53

4 Attachment(s)
You can use your old blocking effectively if you change your outer domain into rectangular shape. Every will be perfect !!!

I am also attaching the intermediate blockings so that you can understand where to start and what to do step by step. Especially pay attention on blocking 3 and blocking 4 where I made three O blocks and deleted middle o-block. b

Also 5 to 10 where I am performing merge operations and association to edges. Blocking 12 with extrude along curve for. Compare blocking 10 with 12 inside the nozzle.

Do not follow blocking 17. First I tried to make the blocking in the injector. Then I deleted and instead first made the o-blocking in side the nozzle and carried into towards the far-field. Then extrude the blocking for the injector pipe and then made the o-blocking for the injector. Got it???

Hope it helps. :rolleyes:


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