CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   CFX (http://www.cfd-online.com/Forums/cfx/)
-   -   question about boundary conditions (http://www.cfd-online.com/Forums/cfx/85209-question-about-boundary-conditions.html)

Nick R February 20, 2011 01:42

question about boundary conditions
 
Hi all,

I'd like to simulate the flow over an infinite wing. For this purpose I created a rectangular domain and created part of the wing inside the domain. I have a problem setting the correct side walls (those that are parallel to the airfoil cross sections). If I set them as symmetry from what I understand it basically prevents spanwise flow normal to the sides walls which would not be realistic. Should I set them as periodic in order to simulate an infinite wing?
Please note that this is not a 2d problem.

I'd appreciate it, if you could give me the instructions in steps (I've never done a period BC (if this is what is needed). Thanks!

ghorrocks February 21, 2011 01:52

If you are expecting your infinite wing to generate 3D structures then you should do with periodic boundaries, with a distance between periodic boundaries at least as long as the biggest 3D structure you expect to see, and preferably several times that size.

Periodic boundaries are just a type of interface. Choose the interface type as periodic and the option as translational.

Nick R February 21, 2011 19:58

Thanks for the comments Glenn. I'll give it a try.


All times are GMT -4. The time now is 00:40.