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

How to simulate a plane with propeller

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 23, 2009, 04:15
Default How to simulate a plane with propeller
  #1
Member
 
Lukasz
Join Date: Mar 2009
Posts: 64
Rep Power: 10
Luk_Fiz is on a distinguished road
Hi all,
I have following problem.
Simulating a propeller (or fan) we usually use "circular" symmetry: we model the flow domain around single blade and after that use symmetry on both sides. We apply rotation and so on... and achieve fan specifications.
But what to do in case of for example plane or hovercraft that also has a propeller but has no circular symmetry in the rest of the construction (a hull, wings)? Is it possible to simplyfy calculation in CFX using some symmetry criteria or to calculate in steps, for example a propeller at first and after that using momentum source for the rest of the plane?

I would be very grateful for any suggestions,
Luk
Luk_Fiz is offline   Reply With Quote

Old   March 23, 2009, 23:44
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 13,193
Rep Power: 102
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Hi,

In this case we use multiple domains. One domain is a rotating frame of reference and the other is stationary, and they are connected with a GGI (the general domain interface).

Regards,
Glenn Horrocks
ghorrocks is offline   Reply With Quote

Old   March 24, 2009, 04:34
Default
  #3
Member
 
Lukasz
Join Date: Mar 2009
Posts: 64
Rep Power: 10
Luk_Fiz is on a distinguished road
Hi Glenn, thanks for Your reply but it is not exactly my point. I know that the domains should be connected by interface (as it is also with propellers if You want to simulate some far "inlet" or "outlet"). But in case of simulating only properller You are able to use "circular" symmetry what dramatically reduces the mesh, time consuption and so on... My question is: are similar things possible with simulation of the for example propeller and the plane hull that has no circular simmetry.

For example, simulating plane with propeller in the nose: can I simulate half of the hull (symmetry BC in plane along the hull) and a single blade of propeller (defined as rotating domain) with circular simmetry.

Simulation of full plane will be very demanding for hardware - entire hull and a multiblade propeller (rotating domain).

Luk
Luk_Fiz is offline   Reply With Quote

Old   March 24, 2009, 17:13
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 13,193
Rep Power: 102
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Hi,

Yes, you can use symmetry and periodicity and combine with multiple frames of reference. You can do this with the frozen rotor or stage averaging approach.

Glenn Horrocks
ghorrocks is offline   Reply With Quote

Old   March 25, 2009, 04:04
Default
  #5
Member
 
Lukasz
Join Date: Mar 2009
Posts: 64
Rep Power: 10
Luk_Fiz is on a distinguished road
Niiiiice!!!
Thanks You very much!


Luk
Luk_Fiz is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Problem with Gmsh nishant_hull Open Source Meshers: Gmsh, Netgen, CGNS, ... 23 August 5, 2015 02:09
ICEM and symmetry plane Roland CFX 3 September 13, 2006 08:38
simulate a tank equipped with propeller inside aloha5i CFX 0 October 15, 2005 15:56
Boundary zones in Gambit for a 3D propeller. Craig Paxton FLUENT 1 June 10, 2002 12:57
Mixing plane geometry definition Hbet FLUENT 0 January 18, 2002 08:16


All times are GMT -4. The time now is 21:50.