why we use c-shape airfoil mesh?
 

Hi guys,

I have a confusion about the airfoil mesh. please see the picture:

http://www.cfd-online.com/Forums/att...1&d=1441776446

In the mesh above, the outer mesh is a box. But it have an O-grid around the airfoil.


http://www.cfd-online.com/Forums/att...1&d=1441776446

In this mesh, the outer mesh is half cylinder.

Usually we use the second one, but I dont know why. Thanks for your hints.
Best,

I am no expert as well, But just to spice this post up I will give you a reply.

The whole Airfoil can be simply viewed as a C shape couldn't we now? Therefore, people use C-grid to align the grid from Far Field until Airfoil. It improves the skew and orthogonality of the mesh. But to be honest, You can have a H-O grid or a C-O grid or an O-O grid and if you know your game of meshing upto quality then it does not matter in my view. I might be wrong, but I have never had any problems since I have employed all these type of grids for different airfoils and still got the same results.

Let's see what others think now :rolleyes: