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-   -   [ICEM] icem build topology problem (http://www.cfd-online.com/Forums/ansys-meshing/95969-icem-build-topology-problem.html)

thais_b January 9, 2012 07:48

icem build topology problem
 
2 Attachment(s)
Hi!
I'm trying to build up a mesh around a 2d airfoil. I created the surface, the lines of the airfoil (it's a naca 0012 with trailing edge gap). However when i apply repair geometry> build diagnostic topology, icem creates some lines that make the mesh does not respect the airfoil boundaries. I've tried patch dependent and independent.
Anyone knows what is this?
Thanks in advance!

Attachment 10737
Attachment 10738

Far January 9, 2012 08:08

pictures are not clear.

thais_b January 9, 2012 09:06

2 Attachment(s)
I'm sorry.
Thanks for you interest, Far!

The problem persists even if i increase the number of elements around the airfoil.
Attachment 10742

Attachment 10743

Far January 9, 2012 09:43

do you want to create unstructured mesh or interested in nice structured mesh with well resolved boundary layer?

thais_b January 9, 2012 10:40

Actually i'm trying to work with unstructured mesh + prism layers.
When Icem did not respect the airfoil, i used to correct it manually, editing the mesh. But the prism is constructed based on the built topology, so it does not work anymore.
I'm doing some research with icing accretions in airfoils, so unstructured mesh seems a good approach for that.
But some other ideas are welcome!
Thanks

PSYMN January 10, 2012 10:53

So you want a flat trailing edge?

Just make sure that your Build topo tolerance is smaller than your trailing edge thickness. Then you will get points on both the top and bottom of the trailing edge.

As for the second set of pics, it looks like the surface is not aligned with the curves, but that is just a display thing. If you want to clean it up, you can go into settings => Model and reduce the triangulation tolerance by an order of magnitude.

Best regards,

Simon

thais_b January 19, 2012 14:01

Thank you so much Simon.
It worked perfectly!

Thaís


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