[ICEM] Body Conformal Mesh

syavash · July 12, 2013, 18:31

Dear mates,

I have tried to generate a mesh around a wing in ICEM. It seems that grid generated around the wing root is body conformal (an ellipse), while I couldn't create such a grid earlier!!
I have attached a picture and as it's obvious, grid boundaries have exceeded the block boundary and have formed an ellipse. The question lies here: How is it possible to have control over grid shape?
Fig.jpg
Thanks

cesarcg · July 12, 2013, 19:06

Is the wing of constant cord length and angle of attack? You can control the grid shape by moving vertices and edges. You can also have control by associating edges to corresponding curves. If I'm not wrong, I can see from your picture that you are using the o-grid topology.

Regards,
César

syavash · July 13, 2013, 06:17

Quote:

Originally Posted by cesarcg

Is the wing of constant cord length and angle of attack? You can control the grid shape by moving vertices and edges. You can also have control by associating edges to corresponding curves. If I'm not wrong, I can see from your picture that you are using the o-grid topology.

Regards,
César

Dear Cesar,
Thanks for replying,
The wing has a taper ratio but there is no twist across the wing.
I see that it is possible to move vertices to define the shape of block (I have done it already).
As you implied, I am using on O-grid mesh type.
I intended to say that why grid cells are not confined in the rectangular block (colored in black) at the root and are forming an ellipse instead.
Regards.

cesarcg · July 13, 2013, 12:42

Dear Syavash,

The grid cells are not confined in that rectangular block because they are following the shape of the airfoil at the root. The same happens along the wingspan. If the grid was not following that shape, I guess that the cells near the edges of the rectangular block would probably be highly distorted, resulting in a low quality of mesh in this region. This grid lines forming an ellipse should become straighter as you move farther from the wing. I hope I made myself enough clear.

Why do you want the cells within this block to match the shape of the black rectangle? Is there any special reason?

Regards.

Far · July 13, 2013, 13:04

following thread may be useful to you.

http://www.cfd-online.com/Forums/ans...mesh-wing.html

also search for video tutorial on youtube with key words "ICEM Hexa meshing tutorial - Wing with sharp trailing edge "

July 12, 2013, 18:31	Body Conformal Mesh	#1
syavash Senior Member Syavash Asgari Join Date: Apr 2010 Posts: 473 Rep Power: 18	Dear mates, I have tried to generate a mesh around a wing in ICEM. It seems that grid generated around the wing root is body conformal (an ellipse), while I couldn't create such a grid earlier!! I have attached a picture and as it's obvious, grid boundaries have exceeded the block boundary and have formed an ellipse. The question lies here: How is it possible to have control over grid shape? Fig.jpg Thanks

July 13, 2013, 13:04		#5
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	following thread may be useful to you. http://www.cfd-online.com/Forums/ans...mesh-wing.html also search for video tutorial on youtube with key words "ICEM Hexa meshing tutorial - Wing with sharp trailing edge " blgypeng likes this.

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July 12, 2013, 19:06		#2
cesarcg Member Cesar Join Date: Nov 2012 Location: Guanajuato, México Posts: 78 Rep Power: 15	Is the wing of constant cord length and angle of attack? You can control the grid shape by moving vertices and edges. You can also have control by associating edges to corresponding curves. If I'm not wrong, I can see from your picture that you are using the o-grid topology. Regards, César

July 13, 2013, 12:42		#4
cesarcg Member Cesar Join Date: Nov 2012 Location: Guanajuato, México Posts: 78 Rep Power: 15	Dear Syavash, The grid cells are not confined in that rectangular block because they are following the shape of the airfoil at the root. The same happens along the wingspan. If the grid was not following that shape, I guess that the cells near the edges of the rectangular block would probably be highly distorted, resulting in a low quality of mesh in this region. This grid lines forming an ellipse should become straighter as you move farther from the wing. I hope I made myself enough clear. Why do you want the cells within this block to match the shape of the black rectangle? Is there any special reason? Regards.