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June 22, 2011, 19:52 |
3d blade mesh problems
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#1 |
New Member
Papis
Join Date: Dec 2010
Posts: 25
Rep Power: 15 |
Hi all
I am trying to create a 3d grid of a blade with flat tips. I have been making 2d grids so I am not new with the blocking strategy but in 3d things get rather complicated. I end up with low quality mesh.I am sure that I am doing something in my blocking stategy. I have links of the steps I make my meshing procedure so it's easier to point out what is wrong. Thanks in advance. 1.The farfield and theblade(http://147.102.42.169/3dgrid/1.png) 2.Created the 3D Bounding box associated the edges and made an O-grid split using the faces at the outflow and those "pointing" in the flat tips of the blade.(http://147.102.42.169/3dgrid/2.png) 3.I split in the "X" and "Z" direction to embrace the blade with a block (http://147.102.42.169/3dgrid/3.png) (http://147.102.42.169/3dgrid/4.png) 4. I delete the block embracing the blade an make edge association to match the blade boundaries (http://147.102.42.169/3dgrid/5.png) 5.The problems start here,because i have to collapse the "trailing edge" blocks. (http://147.102.42.169/3dgrid/6.png) (http://147.102.42.169/3dgrid/7.png) (http://147.102.42.169/3dgrid/8.png) 6.The resulting block structure has this strange triangle-shaped block which produces very strange elements.(in the picture I have removed a layer of blocks) (http://147.102.42.169/3dgrid/9.png) I am sure that my blocking strategy is the problem.I would appreciate any ideas or thoughts. Thanks again Last edited by papis; June 22, 2011 at 19:58. Reason: wrong link |
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June 23, 2011, 02:00 |
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#2 |
Member
jeevan kumar
Join Date: Mar 2009
Posts: 88
Rep Power: 17 |
Hello papis,
Do not delete the block embracing the blade. Create c grid around the blade and extend it in both Z direction till the boundary. Then you collapse the tte wake blocks as you did and also the block inside the blade. regards Jeevan |
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June 23, 2011, 05:29 |
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#3 |
New Member
Papis
Join Date: Dec 2010
Posts: 25
Rep Power: 15 |
Hi Jeevan,
Thanks for your reply.I am not sure I understand what you say. Whether or not I delete the block embracing the airfoil doesn't make any practical difference.After I collapse the trailing edge block these "wedge" shaped boxes appear(from the flat tip to the farfield,I can't collapse those because i will lose the flat tip boundary). Take a look at the resulting blocks after collapsing the blocks of the trailing edge. http://147.102.42.169/3dgrid/wedgeb.png Thanks again for your time |
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June 23, 2011, 07:21 |
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#4 |
Member
jeevan kumar
Join Date: Mar 2009
Posts: 88
Rep Power: 17 |
i am sorry it was my mistake in understanding the issue.
You can do one thing you can create Y-grid for the degenerated wedge shape blocks, this might improve the quality. |
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June 23, 2011, 07:56 |
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#5 |
New Member
Papis
Join Date: Dec 2010
Posts: 25
Rep Power: 15 |
Yeah,you are right Y-grid conversion makes the quality better.
Thanks a lot |
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