CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

Using "opening" to simulate plane flying through air

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By ghorrocks

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 18, 2019, 17:56
Default Using "opening" to simulate plane flying through air
  #1
Member
 
tyw7's Avatar
 
Thu Win
Join Date: Apr 2017
Posts: 70
Rep Power: 5
tyw7 is on a distinguished road
Can I use an "opening" to simulate a condition where the plane is flying through the air?
tyw7 is offline   Reply With Quote

Old   February 18, 2019, 18:32
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 16,639
Rep Power: 130
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
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.
ghorrocks is offline   Reply With Quote

Old   February 18, 2019, 18:33
Default
  #3
Member
 
tyw7's Avatar
 
Thu Win
Join Date: Apr 2017
Posts: 70
Rep Power: 5
tyw7 is on a distinguished road
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?
tyw7 is offline   Reply With Quote

Old   February 18, 2019, 18:40
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 16,639
Rep Power: 130
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
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.
ghorrocks is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
simulate a barrel with fluid inside and air above the fluid richard_vega OpenFOAM 2 October 7, 2019 08:20
Air to Air Heat Exchanger visser1975 FLUENT 2 November 10, 2012 13:34
air bubble is disappear increasing time using vof xujjun CFX 9 June 9, 2009 07:59
TRANSIENT HEAT & BOUYANCY IN CONFINED AIR Carl CFX 1 September 25, 2006 09:48
How i can to simulate the air flow over the car? fernando vicente CFX 3 August 11, 2003 22:35


All times are GMT -4. The time now is 00:09.