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May 17, 2012, 15:18 |
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#1 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
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I didn't check... But I also didn't try. I am sure there will be some need to adjust vertex locations and edge distributions.
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May 17, 2012, 15:22 |
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#2 |
Super Moderator
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Well, what I am trying to ask is that, geometry has very high curvature and sudden change in airfoil size. Therefore may be one need some advanced topologies as you have discussed in three part youtube tutorial on airfoil.
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May 17, 2012, 15:31 |
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#3 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
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Rep Power: 47 |
This blocking looks fine to me...
I guess it may be good to have the Ogrid wrap around the end of the wing, but that is much harder to do with a sharp trailing edge... Basically, you end up creating the Ogrid so it fills the the space around the wing and back to the outlet. You split this Ogrid for the surface of the wing (some Ogrid outside and some inside) and then you collapse the inside portion behind the trailing edge. Sorry, I don't have time to do that right now. But as I said, this blocking is pretty good and can be adjusted (vertex movement and edge distribution) to exceed the quality requirements of all the major solvers.
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May 18, 2012, 01:16 |
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#4 |
Member
Andrey
Join Date: Sep 2011
Posts: 86
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And what about the triangular block at the rear of the wing? Convert to Y-block? My idea was somewhat different, but the first picture is the same.
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May 18, 2012, 01:23 |
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#5 | |
Super Moderator
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Quote:
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May 18, 2012, 06:18 |
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#6 |
Senior Member
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Thanks a lot Simon, It is great..I am just working on improving the quality a bit..
I have one doubt left... .. It is about the conceptual requirement of the o grid (wing box) inside the wing..I didnt understand when you said "to collapse the trialing edge, a wing box is required required inside the wing"... Can anyone explain it a little more.. @Ralen and Far---after applying yblock for the triangular elements, worst quality by det 3*3*3 is around 0.6 Last edited by Ananthakrishnan; May 18, 2012 at 08:43. |
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May 18, 2012, 11:49 |
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#7 | |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
Quote:
It is still not perfect because while the leading edge side of the OGrid solves your 180 degree element problem, the other side gives you 45 degree elements (Probably not a problem for the solver, but not ideal either)... If you created the Ogrid in the wing before collapsing the trailing edge, I guess you could collapse the back side of the Ogrid and have three wedge blocks inside the wing profile, but that topology would require starting over.
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May 18, 2012, 12:03 |
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#9 | |
Super Moderator
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Quote:
@Ananthakrishnan: In wedge block, you cannot put the o-block with simple command, because it will again give you wedge block. For this you need to think the some innovative method. It is also discussed here http://www.cfd-online.com/Forums/ans...mesh-wing.html with different methods. |
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Tags |
asymmetric wing, flipper geometry |
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