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 June 28, 2004, 11:28 Please help #1 Diego Guest   Posts: n/a Hi everyone! I have created an airfoil out of vertices but I also want to rotate it in order to investigate different angles of attack. Is there any chance I can do that without defining again new vertices. Please help me because I have a deadline soon. Thanx a lot!!

 June 28, 2004, 11:35 Re: Please help #2 Jörn Beilke Guest   Posts: n/a csys 2 vset all *set alfa 10 vgen 2 0 vset ,,, 0 alfa 0

 June 28, 2004, 11:54 Re: Please help #3 Diego Guest   Posts: n/a Thank you!! But by what angle rotates the vertises?

 June 28, 2004, 12:19 Re: Please help #4 Diego Guest   Posts: n/a It works fine!! but can i rotate only some of the vertices and not all? How can I select only the vertices of the airfoil and not all of the computational domain. Thanx in advance

 June 28, 2004, 12:43 Re: Please help #5 steve Guest   Posts: n/a You can rotate any set of vertices you want. Just use the vset command to pick the vertices on the airfoil instead of vset all.

 June 28, 2004, 12:52 Re: Please help #6 Diego Guest   Posts: n/a Steve I used the vset command but it won't select the desired vertices. Could you please be more specific? Thanx again!!

 June 28, 2004, 13:43 Re: Please help #7 4xF Guest   Posts: n/a If you do not have a simulation of an airfoil placed in a channel (i.e. free-stream), it is also the same to change the inflow direction (which is basically the same as rotating the whole computational domain with a fixed direction for the inflow velocity).

 June 28, 2004, 16:22 Re: Please help #8 Panos Guest   Posts: n/a What I actually have is a free stream air and an airfoil. Is there a way to rotate only the vertices of the airfoil in orderto investigate the different angles of attack? Thanks a lot

 June 28, 2004, 18:24 Re: Please help #9 Jörn Beilke Guest   Posts: n/a Sorry for that, but it seems that you don't knonw what you are doing at all. If you have a mesh and just rotate the vertices on the surface of the airfoil you cells are distorted. Iy you need an example of a mesh, which can be rotated by any angle with all vertices look at: http://www.beilke-cfd.de/naca.mdl.gz

 June 29, 2004, 04:53 Re: Please help #10 Diego Guest   Posts: n/a I think it's you that you did not understand. I don't have a mesh yet. Just the vertices. And I want to rotate the vertices of the airfoil only!! I don't think that would create distorted cells.

 June 29, 2004, 07:03 Re: Please help #11 4xF Guest   Posts: n/a You have two possibilities: a) do as Jörn says (see response from Monday) and do not think it is stupid, Jörn is probably one of the most experienced posters in this forum... b) do not rotate the vertices at all but change instead the orientation of the inlet velocity (which defines the angle of attack relatively to the profile chord).

 June 29, 2004, 08:02 Re: Please help #12 Diego Guest   Posts: n/a How do I rotate the inlet velocity? Do i have to introduce both x and y components of velocity? Is it also neseccary to change also the boundaries? Thanx a lot

 June 29, 2004, 08:02 Re: Please help #13 Jörn Beilke Guest   Posts: n/a what about a: vset all vplo vset subs zone There are lots of possibilities to select vertices using the vset command.