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August 2, 2012, 18:17 |
C-grid and angle-of-attack for airfoil
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#1 |
New Member
Clifton Perkins
Join Date: Aug 2012
Posts: 3
Rep Power: 14 |
I want to simulate different angles-of-attack (AOA) for flow over the NACA 0012 airfoil. I'm using the NASA C-grids, from:
http://turbmodels.larc.nasa.gov/naca0012_grids.html Re-meshing isn't an option and I'm not sure to handle the different AOA. There are results at the NASA website for different AOA, so I'm assuming there's a standard approach for dealing with this issue. I know that the obvious thing to do is just change the inlet BC to match the AOA. But with this I run into a couple of issues for non-0 AOA: - the flow is no longer parallel to the side (virtual) walls of the domain; I am using free-slip BC there, to help with convergence, but could try free inflow/outflow (aka Riemann BC I think) instead - at one end of my inlet (inlet = C-shaped portion of boundary), I get "inflow" BCs that are actually pointing out of the domain (I guess I could modify the location at which "inlet" becomes "side" to avoid this, but would then need different region labeling for each AOA) Does anyone have a recommendation on how to proceed? I'm using a commercial CFD package, but probably better not say which one. Thanks for all replies!! |
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August 3, 2012, 04:09 |
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#2 |
Senior Member
cfdnewbie
Join Date: Mar 2010
Posts: 557
Rep Power: 20 |
Hey Clifton,
just to clarify: are you doing sub or supersonic flows? cheers cfd newbie |
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August 3, 2012, 10:26 |
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#3 |
New Member
Clifton Perkins
Join Date: Aug 2012
Posts: 3
Rep Power: 14 |
Thanks for your reply, cfd newbie. I'm sorry, I should have mentioned that it's incompressible flow and yes, subsonic.
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August 14, 2012, 03:23 |
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#4 |
Member
Haris Hameed
Join Date: Oct 2009
Posts: 48
Rep Power: 17 |
hi
why dont you use pressure farfield boundary condition... i have simulated the same 2D cases in fluent (commercial pakage) got good results even for aoa 10 deg and 15 deg i dont know ur solver so cant comment on ur strategy |
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Tags |
angle of attack, boundary conditions, c-grid, naca 0012 |
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