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CFD validation case,Help!

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Old   February 8, 2010, 15:24
Default CFD validation case,Help!
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Yibin Dou
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hello everyone, did anybody have an experience on the CFD validation case in NPARC, like RAE2822 airfoil and M6 wing. I have difficult in simulate the RAE2822 case even though I use the same grids as the test case used. I used CFX and Fluent software, but the result is too bad. So can anyone help me and give me some advice about how to set the boundary condition or other problem. Thank you very much.
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Old   February 8, 2010, 19:19
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Ahmed
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Are you referring to this case http://www.grc.nasa.gov/WWW/wind/val...af/raetaf.html
It is a classical case, inlet, top, bottom are far field bc,
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Old   February 9, 2010, 18:52
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Thanks, the nets I have already know, in CFX it has not FARFIELD boundary condition, so what condition is proper? Opening or Inlet and Outlet, I am not very sure. Or whatever condition, the key point is setting free stream condition in the farfield and average 0 pressure in the outlet? Am i right? Thanks a lot
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Old   February 9, 2010, 22:04
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The far field BC in Fluent parlance is the classical plenuum BC (flow variables do not change with respect to time) In the CFX parlance I think it is called reservoir (not sure, it has been a long time )
The outlet is just outlet BC where the gradients of the flow variables are Zero by definition, i.e, a smart way of extrapolating the flow variables to the outlet itself
Good Luck
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