simulating an airfoil using a moving boundary

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

 January 25, 2007, 03:32 simulating an airfoil using a moving boundary #1 Alejandro Guest   Posts: n/a Hi to all! The conventional procedure to compute the aerodynamic coefficients for an airfoil is to define the airfoil as a solid stationary wall, and define an incoming velocity at different angles of attack in the far field. I have been trying something a bit different, leave the conditions in the far field with 0 m/s, and instead, define the airfoil as a moving solid boundary, using a velocity in the opposite direction. I was hoping to find, instead of the always "normal" streamlines along the profile, the real flow fiel of an airfoil as it moves through a stationary fluid. Although the relative "velocity" between fluid and body remains the same, the values for lift and drag are completely different (and obviously false for the case of the moving boundary). I´m trying this as a preliminary simulation of the interaction of two bodies with a relative velocity, so I wanted to leave one of them stationary, and give the other one a relative wall velocity, but if it doesn´t even work for the airfoil, then I must be doing something wrong Does anybody have any idea to this? Thank you! Best regards, Alejandro

 January 25, 2007, 03:43 Re: simulating an airfoil using a moving boundary #2 rams Guest   Posts: n/a From my experience i understrand that if u try to model an object moving in a stationary fluid with fluent it gives worng results. fluent calculates the shear forces on the surface but it won't give u the force normal to the surface correctly. Now in your case, there would obviosly be getting wrong drag & lift forces, as u'r modellin the other way. i would suggest u go the conventional way of modelling. but still if u could find a way out to do the otherway, do let me know, Thanks & Regards, Rams

 February 10, 2007, 00:46 Re: simulating an airfoil using a moving boundary #3 gholam Guest   Posts: n/a I dont't know too,but you should know the conditions of fluid around the airfoil when the airfoil is moving would completely be different from the time you have put the airfoil stationary and the fluid is moving.

 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 HMR CFX 5 October 10, 2016 05:57 Attesz CFX 7 January 5, 2013 04:32 vatsa STAR-CCM+ 0 February 11, 2010 01:14 aiya Main CFD Forum 6 May 10, 2007 11:33 Alejandro CFX 4 January 27, 2007 13:03

All times are GMT -4. The time now is 03:03.