[ICEM] blocking strategy for ellipse geometry

gajemon · November 26, 2009, 07:03

What is the blocking strategy for ellipse-tube geometry?
Is it really to receive structural mesh with BL for this geometry?

Thanks in advance

zeitistgeld · November 27, 2009, 04:42

Is that want you want?

gajemon · November 27, 2009, 05:21

Quote:

Originally Posted by zeitistgeld

Is that want you want?

yes, thanks. please explain me how do you get this block/blocks

zeitistgeld · November 27, 2009, 12:31

First, add the top bottom and side surface to different parts, split the side surfce by four isocurves in v direction, then split the four side surfaces using repair geometry tool "split folded surface" with max angle 90 degrees and you will get a lot side surfaces that could be mapped.
second, before blocking, bulid topology first and use surface blocking to block all the surfaces. but for the top and bottom surface blocks you should do some split faces and edges to make the blocks mappable. Now you edit all the blocks to convert them to mapped 2d blocks.
final step, 2d blocks to 3d blocks transformation, using advanced fill, not simple fill(attention!), with oblock around all the side surface blocks, you will get it done!
Most important is you should do a lot on geometry in the first step before you can make mapped blocks on the surfaces especially the side four edge surfaces.
Hope this can help you, be blessed!

PSYMN · November 27, 2009, 23:39

Great post zeitistgeld,

One extra bit about the geometry prep... If you go into the geometry tools and create iso curves that will follow the twist of the spiral, it becomes easier to associate the edges.

It is usually easy because the surfaces follow the twist and you can just make an iso-curve along the middle of the surface or the 25% line or whatever...

I also do that with fillets, etc. Any where that I want an edge to follow a compound curve along the middle of a surface. You may also have good tools to do that in your CAD package.

gajemon · November 30, 2009, 05:03

Thanks a lot, zeitistgeld and Simon!

to zeitistgeld:
Can you give a detailed account of "split the side surfce by four isocurves in v direction"
Which of Isocurves methods should I use?

maalan · April 21, 2014, 16:19

Hi, Simon!! I have seen your tutorial about meshing a 2D airfoil on youtube because I need to mesh a 2% ellipse... Due to its big aspect ratio I though of doing a conformal mapping in order to get a high quality structured mesh. Do you know how to manage it with ICEM?? Is it possible?

Thanks in advance, and nice job with the tutorial!! I have learned so much!

Best!

November 27, 2009, 23:39	Iso Curve...	#5
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	Great post zeitistgeld, One extra bit about the geometry prep... If you go into the geometry tools and create iso curves that will follow the twist of the spiral, it becomes easier to associate the edges. It is usually easy because the surfaces follow the twist and you can just make an iso-curve along the middle of the surface or the 25% line or whatever... I also do that with fillets, etc. Any where that I want an edge to follow a compound curve along the middle of a surface. You may also have good tools to do that in your CAD package.

November 30, 2009, 05:03		#6
gajemon New Member Join Date: Oct 2009 Posts: 20 Rep Power: 16	Thanks a lot, zeitistgeld and Simon! to zeitistgeld: Can you give a detailed account of "split the side surfce by four isocurves in v direction" Which of Isocurves methods should I use? Last edited by gajemon; November 30, 2009 at 09:13.

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November 27, 2009, 12:31		#4
zeitistgeld Member zeitistgeld Join Date: Apr 2009 Posts: 37 Rep Power: 16	First, add the top bottom and side surface to different parts, split the side surfce by four isocurves in v direction, then split the four side surfaces using repair geometry tool "split folded surface" with max angle 90 degrees and you will get a lot side surfaces that could be mapped. second, before blocking, bulid topology first and use surface blocking to block all the surfaces. but for the top and bottom surface blocks you should do some split faces and edges to make the blocks mappable. Now you edit all the blocks to convert them to mapped 2d blocks. final step, 2d blocks to 3d blocks transformation, using advanced fill, not simple fill(attention!), with oblock around all the side surface blocks, you will get it done! Most important is you should do a lot on geometry in the first step before you can make mapped blocks on the surfaces especially the side four edge surfaces. Hope this can help you, be blessed!

April 21, 2014, 16:19		#7
maalan Member Join Date: Jun 2011 Posts: 80 Rep Power: 14	Hi, Simon!! I have seen your tutorial about meshing a 2D airfoil on youtube because I need to mesh a 2% ellipse... Due to its big aspect ratio I though of doing a conformal mapping in order to get a high quality structured mesh. Do you know how to manage it with ICEM?? Is it possible? Thanks in advance, and nice job with the tutorial!! I have learned so much! Best!