# 2D Axisymmetric vs. 3D

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

 July 31, 2009, 21:12 2D Axisymmetric vs. 3D #1 New Member   Adam Loesch Join Date: May 2009 Posts: 8 Rep Power: 10 I am running a drag study on a shape that is essentially a revolved airfoil. As a test, I ran this shape in a 3D case then to cut down on computational time, I ran it in an antisymmetric 2D case. Problem is that the antisymmetric 2D case yields a drag which is nearly three times that of the 3D case (0.06lbf as compared to 0.18lbf). My tests are being performed at low velocities (30fps). I realize that with this little amount of information it is impossible for anyone to give me a definitive cause, but I was curious if this much variation is to be expected with such a low velocity, Reynolds Number, and drag, and if so, which calculation is more likely to be closer to the actual physical case. Thank you for any insight you can provide.

 August 3, 2009, 00:51 #2 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,239 Rep Power: 34 axisymmetric gives you results as it should be in 3d. * Is your 3d-model a full one, or did you use symmetric planes? * Did you give same BC in 2d as in 3d? compare the massflow-rates between 3d and 2d-axi __________________ In memory of my friend Hervé: CFD engineer & freerider

 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 Arpit Tiwari Main CFD Forum 1 September 15, 2010 05:45 jinwon park Main CFD Forum 0 February 26, 2008 17:26 prc Siemens 4 February 7, 2007 07:42 Suman Kumar Main CFD Forum 1 November 20, 2001 15:51 S. Kumar Main CFD Forum 0 November 10, 2001 11:15

All times are GMT -4. The time now is 10:52.