CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

How to start unsteady propeller CFD

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

LinkBack Thread Tools Display Modes
Old   February 4, 2009, 11:44
Default How to start unsteady propeller CFD
Posts: n/a

I have to do an unsteady CFD on an airplane propeller in front of a non-symmetric fuselage (sliding mesh).

Does anyone know, with what kind of steady solution I should start the computation? The problem is unsteady by definition, so there is no real steady solution to start with, is there? How should such an unsteady computation be started without having to accelerate all the way from zero velocity?


  Reply With Quote

Old   February 14, 2009, 02:13
Default Re: How to start unsteady propeller CFD
Posts: n/a
Starting from a steady solution might appear faster but may not give the correct result. In rotorcraft unsteady simulation almost always start from nothing and require >3 full revolutions to get the transients far enough away from the blades to not be important. If you start from a steady state solution the flow field still has start up transients (just different ones) that take >3 revs to move away so you might as well start from nothing. As a side note: If your looking at loads on the fuselage it might take substantually more revs than 3.

  Reply With Quote


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
How to start a 2D CFD code? entropies Main CFD Forum 6 August 2, 2011 15:19
What is the Better Way to Do CFD? John C. Chien Main CFD Forum 54 April 23, 2001 08:10
ASME CFD Symposium, Atlanta, 22-26 July 2001 Chris R. Kleijn Main CFD Forum 0 August 1, 2000 10:07
part-time-cfd Michael Main CFD Forum 6 February 2, 2000 13:01
cfd job Dr. Don I anyanwu Main CFD Forum 20 May 17, 1999 15:13

All times are GMT -4. The time now is 16:18.