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[ICEM] Multizone meshing Problem for External Flow Meshing

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Old   March 19, 2013, 11:24
Default Multizone meshing Problem for External Flow Meshing
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Ali
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Hi,

i am trying to mesh on a fin-body configuration using multizone option in ICEM 14.5, facing problem while filling the 2D block to 3D fill.

The geometry consists of body+fins (360 deg no symmetry) and a farfield (cylinder). The body is enclosed in the farfield surface (no contact between the body and farfield). The material point is defined between the body and farfield.

2D surface block initialized very well. When I tried to fill it with Multizone with advanced filling option, volume filled the farfield ignoring the body.

No volume mesh, why?

Anybody can help me?

Its an external flow problem.
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Last edited by Hybrid; March 19, 2013 at 11:27. Reason: To edit title, subject heading
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Old   March 20, 2013, 10:51
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at the moment, 2D to 3D fill only works if the faces are all connected. It will not support this situation where there is no contact between the FF and the body.

You could try creating a symmetry model (the symmetry plane could connect the FF and Body) and then mirror it if you need a full model.
Far likes this.
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Old   March 24, 2013, 14:10
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It works really great with a half mesh.

The problem arises at the sharp trailing edge of the airfoils, a very low quality mesh Quality is around 0. in that areas.

How can I handle that while working in multizone meshing?
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Old   March 25, 2013, 10:26
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Maybe a picture of the problem would help.
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Old   March 28, 2013, 13:30
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here are a pic and project file attached.
Attached Images
File Type: jpg wing.jpg (57.5 KB, 68 views)
Attached Files
File Type: zip multizone.zip (30.3 KB, 13 views)
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Old   March 28, 2013, 15:07
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In your case, you had very high aspect ratio quads... I didn't even see a volume mesh, but if you had generated one, the pyramids against those quads would have been even worse...

How about a nice MultiZone swept mesh instead?

Something like this (the CYAN mesh is a cutplane thru a swept quad dominant MZ mesh).

MZ_Wing.jpg

I attached a blocking file. Let me know if I have permission to post a tutorial on this model and I will make a 1 minute demo to show you how it is done.

Best regards,

Simon
Attached Files
File Type: zip MZ_Simon.blk.zip (4.4 KB, 19 views)
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Old   March 28, 2013, 15:08
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I should note that for the best quality mesh, I would recommend a hexa blocking... But the MultiZone Mesh can be done without any blocking skills...
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Old   March 28, 2013, 17:36
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Error in opening Blocking File. Better to add geometry as well.

You can post the tutorial privately if not possible to post here.
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Old   March 28, 2013, 17:42
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Prisms not there, what happened with quality when prism layers will present?

can this technique be used for complex configurations like whole aircraft with control surfaces etc ?


Quote:
Originally Posted by PSYMN View Post
How about a nice MultiZone swept mesh instead?

Something like this (the CYAN mesh is a cutplane thru a swept quad dominant MZ mesh).

Attachment 20225




Simon
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Old   March 29, 2013, 10:24
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Quote:
Originally Posted by PSYMN View Post
In your case, you had very high aspect ratio quads... I didn't even see a volume mesh, but if you had generated one, the pyramids against those quads would have been even worse...

How about a nice MultiZone swept mesh instead?

Something like this (the CYAN mesh is a cutplane thru a swept quad dominant MZ mesh).

Attachment 20225

I attached a blocking file. Let me know if I have permission to post a tutorial on this model and I will make a 1 minute demo to show you how it is done.

Best regards,

Simon
Quote:
Let me know if I have permission to post a tutorial on this model and I will make a 1 minute demo to show you how it is done
That would be great help to us. I always come across issues while dealing with Multizone rather never had a success with it
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