Boundary Conditions for a spherical far field/ easier way of setting up multiple sims

pizzaspinate · August 21, 2015, 05:56

Hi everybody,

I would like to simulate a wing enclosed in a sphere in ANSYS CFX. At the moment I set the boundary conditions by entering a primitive region which slices the sphere in a half. Then I assign one half to be an inlet and the other one to be an outlet. However, I need to run simulations fro several angle of attack. At the moment I rotate the sphere for every AoA and try to slice the primitive region at about the same position as for the previous setup.
I think this not a very efficient way of doing it. I was wondering if there is an easier way of doing it and/or a more accurate way (because I doubt that I pick always the same position for the primitive regions). Also is the way of assigning the BC correct?

Hope someone can help me out!

Thank you very much in advance!

ghorrocks · August 21, 2015, 19:10

When you start a new simulation it is a really good idea to first go to the library (or google these days) and see what other researchers have done. There are zillions of papers on this sort of stuff so you might as well find out what they used.

The "C" grid is a popular option. That has a curved inlet and a flat outlet. You can then change angle of attack easier.

August 21, 2015, 05:56	Boundary Conditions for a spherical far field/ easier way of setting up multiple sims	#1
pizzaspinate Member Join Date: Dec 2012 Posts: 81 Rep Power: 13	Hi everybody, I would like to simulate a wing enclosed in a sphere in ANSYS CFX. At the moment I set the boundary conditions by entering a primitive region which slices the sphere in a half. Then I assign one half to be an inlet and the other one to be an outlet. However, I need to run simulations fro several angle of attack. At the moment I rotate the sphere for every AoA and try to slice the primitive region at about the same position as for the previous setup. I think this not a very efficient way of doing it. I was wondering if there is an easier way of doing it and/or a more accurate way (because I doubt that I pick always the same position for the primitive regions). Also is the way of assigning the BC correct? Hope someone can help me out! Thank you very much in advance!

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August 21, 2015, 19:10		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,705 Rep Power: 143	When you start a new simulation it is a really good idea to first go to the library (or google these days) and see what other researchers have done. There are zillions of papers on this sort of stuff so you might as well find out what they used. The "C" grid is a popular option. That has a curved inlet and a flat outlet. You can then change angle of attack easier.