[Bharatt]

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

bharat

[-mAx-]

may I see your decomposition in area of trailing edge?

[Bharatt]

Originally Posted by -mAx-

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-]

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]

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-]

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-]

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]

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

[-mAx-]

Sans titre.jpg
Merge red square domain with blue one
One it is done, split the new domain, along the black dotted line

[Bharatt]

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-]

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]

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

bharat