How to start unsteady propeller CFD

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 LinkBack Thread Tools Display Modes
 February 4, 2009, 11:44 How to start unsteady propeller CFD #1 Joe Guest   Posts: n/a Hi, 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? Thanks, Joe

 February 14, 2009, 02:13 Re: How to start unsteady propeller CFD #2 Flynt Guest   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. Bryan

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post entropies Main CFD Forum 6 August 2, 2011 15:19 John C. Chien Main CFD Forum 54 April 23, 2001 08:10 Chris R. Kleijn Main CFD Forum 0 August 1, 2000 10:07 Michael Main CFD Forum 6 February 2, 2000 13:01 Dr. Don I anyanwu Main CFD Forum 20 May 17, 1999 15:13

All times are GMT -4. The time now is 20:11.

 Contact Us - CFD Online - Top