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-   -   [ICEM] ICEM Wing (http://www.cfd-online.com/Forums/ansys-meshing/119766-icem-wing.html)

syavash June 24, 2013 14:42

ICEM Wing
 
2 Attachment(s)
Dear mates,

I want to generate hexa mesh around a 3-D simple wing by ICEM. I have constructed the blocks correctly (I think!) but grid is not generated. I need your help to figure out what the problem is. Simon & Far, I think you can resolve the problem. I have attached my project files and an image.

Thanks

Far June 25, 2013 08:37

Hi,

There are few problems which should be rectified:

1. No of nodes are very few.

2. Delete block(s) inside wing or change its material

3. Create o-grid inside the wing tip which extends into far field.

syavash June 25, 2013 08:52

Quote:

Originally Posted by Far (Post 435841)
Hi,

There are few problems which should be rectified:

1. No of nodes are very few.

2. Delete block(s) inside wing or change its material

3. Create o-grid inside the wing tip which extends into far field.

Dear Far,

thanks for replying,

I could get your point concerning deleting block inside the wing. But two other points are not clear to me.
I have already constructed an O-grid from tip toward the far-field (as your tutorial in youtube).
Please tell me why I should increase No. of points on the wing? (and how?)

Far June 25, 2013 08:56

download video. Upload will take some time (may be 2-3 hrs). mean while you will get message error 403 or 404


https://dl.dropboxusercontent.com/u/68746918/wing.mp4

syavash June 25, 2013 09:04

Quote:

Originally Posted by Far (Post 435857)
download video. Upload will take some time (may be 2-3 hrs). mean while you will get message error 403 or 404


https://dl.dropboxusercontent.com/u/68746918/wing.mp4

As you mentioned I am getting error 404 while downloading it. but let me ask what this video is about?!

syavash June 25, 2013 09:11

Quote:

Originally Posted by syavash (Post 435855)
Dear Far,

Please tell me why I should increase No. of points on the wing? (and how?)


I think you intended to say that there are not enough MESH points on the edges, am I right?!

syavash June 25, 2013 09:19

I think the problem is with the inner face of O-block inside the wing tip. mesh is not generated for that region at the wing root and outer far-field block face.
But the wing tip is totally mesh-less (even the O-grid around the inner face). Why is that so?! Have any Idea??

Far June 25, 2013 11:42

yes, it shows file is still not uploaded

syavash June 29, 2013 13:04

Quote:

Originally Posted by Far (Post 435902)
yes, it shows file is still not uploaded

Dear Far,

thanks to your comments I could generate the grid properly, now my problem is with boundary conditions. I know how to define BC in 2-D. But in a 3D case I have no experiences. I have tried to build 6 parts by 6 corresponding surfaces of the domain (a cube). Then I have associated the block faces to these 6 surfaces. I think this is a right method but is very time consuming.
Is there any better and shorter way to define BC in a 3D geometry?!

Thanks

Far June 29, 2013 13:41

Do not associate faces to surfaces. It is done by icem by default.

syavash June 29, 2013 14:01

Quote:

Originally Posted by Far (Post 436784)
Do not associate faces to surfaces. It is done by icem by default.

So how does Fluent recognize the BC faces?! Shouldn't we associate any elements? what about edges or vertices?!

Far June 29, 2013 14:06

It will. However you have to associate edges and vertices to curves and points respectively.


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