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[ICEM] Problem with a nozzle and ambient volume

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Old   December 14, 2012, 08:43
Default Problem with a nozzle and ambient volume
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Davide
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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
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Old   December 14, 2012, 09:26
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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
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Old   December 14, 2012, 10:02
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here is the file.
thank you for the help!
Attached Files
File Type: zip mesh_nozzle.zip (34.6 KB, 21 views)
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Old   December 14, 2012, 11:54
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Sijal Ahmed Memon (turboenginner@gmail.com)
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You have problems in the outer volume and in the injector. I tried to make the o-grid but unsuccessful.
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Old   December 14, 2012, 14:18
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Sijal Ahmed Memon (turboenginner@gmail.com)
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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.
Attached Images
File Type: jpg nozzle001.jpg (89.2 KB, 42 views)
File Type: jpg nozzle002.jpg (88.4 KB, 40 views)
File Type: jpg nozzle003.jpg (88.1 KB, 41 views)
File Type: jpg nozzle004.jpg (88.0 KB, 33 views)
Attached Files
File Type: zip Nozzle_Far.zip (29.5 KB, 14 views)
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Old   December 15, 2012, 06:40
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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! =)
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Old   December 15, 2012, 07:53
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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.
Attached Files
File Type: zip Nozzle_Far_intermediateblocking1.zip (69.7 KB, 13 views)
File Type: zip Nozzle_Far_intermediateblocking2.zip (69.9 KB, 9 views)
File Type: zip Nozzle_Far_intermediateblocking3.zip (64.3 KB, 9 views)
File Type: zip Nozzle_Far_intermediateblocking4.zip (51.3 KB, 8 views)
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