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[ICEM] Multizone Meshing

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Old   February 23, 2012, 02:16
Default Multizone Meshing
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Dear:

I have made a multi-zone mesh in ICEM around a cylindrical body with a blunt nose.

I want a butterfly mesh at the surface of the far-field region (front and back) as shown in figure 5 and 6.

5.jpg

6.jpg

Initially, I made a mesh as shown in figures 1a, 2a, and the cut plane at Z=0 in figure 3a.

1a.jpg

2a.jpg

3a.jpg
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Old   February 23, 2012, 02:19
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Continuity of previous thread:


To make the butterfly mesh at the base of far-field I split O-block at that face, that deteriorate my mesh (see figures 1, 2 and 3).

1.jpg

2.jpg

3.jpg

Tell me how can I make the butterfly mesh on the body nose and base and similarly on the far-filed downstream and upstream region, as I showed in figures 5 and 6 (in first post).

6.jpg

I also need to have a wake behind the body like in figure 4.

4.jpg
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Old   February 25, 2012, 03:56
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Any one can help me?
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Old   February 25, 2012, 17:47
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Sure, but not with MultiZone...

Perhaps you should start with regular hexa blocking as the first step...

Initialize blocking, then split for the semi-circular portion of the far field and then use split blocks => Ogrid... Select the blocks and select the one face at the outlet of the FF. Apply... THis will give you your nice outer mesh...

You can keep splitting to get a fully hexa model or you could convert the inner block to "free" and proceed with Multizone...
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Old   February 25, 2012, 17:48
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I should say that if you want to start with Multizone, it may be best to subdivide your surfaces as you like before initializing the 2D blocking...
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Old   February 26, 2012, 00:32
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Quote:
Originally Posted by PSYMN View Post
I should say that if you want to start with Multizone, it may be best to subdivide your surfaces as you like before initializing the 2D blocking...
We should divide the body into different surfaces or far field?. Sorry I didn't get this point.
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Old   February 26, 2012, 21:35
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Multizone starts with an operation to extract surface blocking from the surfaces... Surfaces with 4 corners (not necessarily 4 sides) get mapped. Surfaces with 3 corners get mapped with a quarter Ogrid... Other numbers of corners may get a free face.

Since his Far field has a round outlet, it gets a free surface. If he wants it some other way, he could "draw" curves on it and then build topo so the drawn lines will segment the surface. Then the surface blocking will give that configuration...

Its not what I would do (I would do top down), but it would work...
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