# Using "opening" to simulate plane flying through air

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 February 18, 2019, 17:56 Using "opening" to simulate plane flying through air #1 Member     Thu Win Join Date: Apr 2017 Posts: 70 Rep Power: 6 Can I use an "opening" to simulate a condition where the plane is flying through the air?

 February 18, 2019, 18:32 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 16,644 Rep Power: 130 It depends. A vague question gets a vague answer. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

 February 18, 2019, 18:33 #3 Member     Thu Win Join Date: Apr 2017 Posts: 70 Rep Power: 6 Depends on? I am simulating a plane at cruise, so I think the "box" of the wind tunnel could be set as an "opening" with 0 relative pressure. What do you think?

 February 18, 2019, 18:40 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 16,644 Rep Power: 130 It depends on the Mach number you are simulating, numerical stability considerations, how the boundary is implemented and many others. The normal way of modelling a body in far field flow (this is the technical term for what you are trying to do) is to put a box around the body with an inlet where the flow goes in and outlet where the flow goes out. Inlet/Outlet pairs tend to be more numerically stable than openings. You need to do sensitivity analyses to find out how close you can put the inlets and outlets to the body - 5 chord lengths upstream for the inlet and 20 chord lengths downstream and to the side would be a good starting point. aero_head likes this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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