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Bharatt June 21, 2012 02:57

Trailing edge mesh problem
1 Attachment(s)
Hello everyone,

i am meshing an 2-D airfoil in a wind tunnel with y+=1 and unstructured mesh away from airfoil.i am facing problems while generating boundary layer mesh on the trailing edge of the airfoil. i am using wedge corner shape option here which gives me this ERROR: NODE XXXXX(increases whenever i choose this option eg 3342,3489,3571.... ) on the exterior boundary is merged. i will be very thankful if any other method is enlightened other than this method OR the correct way in approaching wedge corner option.

thanks in advance :)


-mAx- June 21, 2012 05:59

may I see your decomposition in area of trailing edge?

Bharatt June 21, 2012 06:57

1 Attachment(s)

Originally Posted by -mAx- (Post 367609)
may I see your decomposition in area of trailing edge?

Hey Max,

thanks for your reply, here i post you the decomposition area for trailing edge

-mAx- June 21, 2012 07:02

try to do one more split along x from trailing edge.
Then don't "close" the BL at trailing edge, but extend it along this split.

Bharatt June 21, 2012 08:38

thanks for the suggestion :) but, i apologize for not mentioning this:- as i have to create unstructured mesh near the airfoil(inside the box only) and continue meshing with structured(quad/map) away from the box in the wind tunnel. as extending BL along that split will create meshing problems further. is there any other way out?

-mAx- June 21, 2012 08:45

where should be the problem?
Can you send me your dbs file
PS: Why are you decomposing your domain around your airfoil, as you would mesh it with hexa? And finally you mesh it with tri?

-mAx- June 22, 2012 03:33

ok since I cannot see what's going on the trailing edge, you may try to merge the domain with airfoil and the one behind the trailing edge.
Then split again axial from trailing edge and extend the BL here.
The wake will be finer meshed

Bharatt June 22, 2012 06:23

i am unable get it. i would be thankful if any picture is provided.

-mAx- June 22, 2012 07:39

1 Attachment(s)
Attachment 13983
Merge red square domain with blue one
One it is done, split the new domain, along the black dotted line

Bharatt June 22, 2012 09:37

2 Attachment(s)
thanks for the image, since i am new in using BL for simulations, i have one doubt:- is it okay to elongate the BL throughout the stretch. because i'll be using some turbulence models like S-A and SST, does it effect my result?

-mAx- June 25, 2012 01:00

Since you are no more at wall proximity, I don't think it could be a problem (that's my opinion).
By enabling aspect-Ration algorithm, you can enlarge the BL away from wall
Again all those stuffs could be preventing if you solve your trailing edge issue

Bharatt June 30, 2012 00:57

Hey Max,

thanks a lot for your comments that helped me a lot :). my problem is solved. i made it into blunt(trailing edge) which was much easier to mesh


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