CFD Online Logo CFD Online URL
Home > Forums > FLUENT

2D Axisymmetric vs. 3D

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

LinkBack Thread Tools Display Modes
Old   July 31, 2009, 21:12
Default 2D Axisymmetric vs. 3D
New Member
Adam Loesch
Join Date: May 2009
Posts: 8
Rep Power: 8
aloesch is on a distinguished road
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.
aloesch is offline   Reply With Quote

Old   August 3, 2009, 00:51
Super Moderator
-mAx-'s Avatar
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,022
Rep Power: 31
-mAx- will become famous soon enough
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
-mAx- is offline   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
Axisymmetric Swirl Arpit Tiwari Main CFD Forum 1 September 15, 2010 05:45
Level set equation in axisymmetric 2-D flow jinwon park Main CFD Forum 0 February 26, 2008 17:26
axisymmetric model issue prc CD-adapco 4 February 7, 2007 07:42
URGENT ! Need help on Axisymmetric Flow ! Suman Kumar Main CFD Forum 1 November 20, 2001 15:51
Axisymmetric Flow S. Kumar Main CFD Forum 0 November 10, 2001 11:15

All times are GMT -4. The time now is 07:45.