BC at airfoil TE
Hi everyone. I wish to know how best to set a TE boundary condition for 2D airfoil calculation, when TE has some thickness. Governing EQ is 2D NavierStokes. and geometry is C type. Anyone can help me?

Re: BC at airfoil TE
Hi,
It will be good to insert another block behind the TE. Regards Li 
Re: BC at airfoil TE
what does TE represent?

Re: BC at airfoil TE
Trailing Edge

Re: BC at airfoil TE
If you have a Cgrid, you really want a sharp trailing edge, otherwise you are better off with an Ogrid. So I would say the quickest way will be to fix your TE, i.e. make the two points defining the blunt edge coincide, which makes it sharp.

Re: BC at airfoil TE
I think you are right. It will be the quickest way by using Ogrid. Enough grid points can be employed at the trailing edge so that the wake can be captured. However, for this case with a structured grid topology, good quality grid can only be achieved by using multiblock.
Regards Li 
Re: BC at airfoil TE
I am not sure about the thickness of this TE, but if it's less than 1% of chord, I would not even bother modeling it. Drag prediction for airfoils, even with a full Navier Stokes solver and the 'right' turbulence model, is a shot in the dark, whereas the TE thickness effect on lift is negligible.
If he uses an Ogrid, he will have to throw a lot of points on this TE to make it numerically round. Otherwise he will have nonsmooth transformation metrics at the 'kink', which will most likely create numerical problems for the solver. My recommendation: stay with the Cgrid and make the edge sharp. For a Cgrid, a sharp TE does not pose any problem (metrics are perfectly smooth). 
Re: BC at airfoil TE
Refer to Jack Moran Computational Fluid Dynamics

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