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-   -   [ICEM] Multizone meshing Problem for External Flow Meshing (https://www.cfd-online.com/Forums/ansys-meshing/114887-multizone-meshing-problem-external-flow-meshing.html)

Hybrid March 19, 2013 11:24

Multizone meshing Problem for External Flow Meshing
 
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.

PSYMN March 20, 2013 10:51

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.

Hybrid March 24, 2013 14:10

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?

PSYMN March 25, 2013 10:26

Maybe a picture of the problem would help.

Hybrid March 28, 2013 13:30

2 Attachment(s)
here are a pic and project file attached.

PSYMN March 28, 2013 15:07

2 Attachment(s)
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

PSYMN March 28, 2013 15:08

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...

Hybrid March 28, 2013 17:36

Error in opening Blocking File. Better to add geometry as well.

You can post the tutorial privately if not possible to post here.

Hybrid March 28, 2013 17:42

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 (Post 417059)
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


cfd seeker March 29, 2013 10:24

Quote:

Originally Posted by PSYMN (Post 417059)
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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