CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Low values of Lift force

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 1, 2011, 19:44
Default Low values of Lift force
  #1
Senior Member
 
Ugly Kid Joe
Join Date: Aug 2010
Posts: 193
Rep Power: 6
vmlxb6 is on a distinguished road
I am trying to simulate a flow over a cylinder in 2-D. Its a 1 way FSI moving mesh problem. I am getting very low values of vertical displacement due to low vertical forces ??? I don't understand the main reason for it. I followed the following steps but failed:

1.) Tried changing the mesh from unstruc to struc. hexa
2.) Tried changing the outlet BC's
3.) Tried increasing the boundary layer thickness.
4.) Tried running the program at very very low courant number like in the range of 0.02
5.) Tried reducing the values of residuals even further. Its currently at RMS 1.E-4
6.) Tried reducing the mesh displacement residuals even lower than E-4

Nothing seemed to work. I need to match up the lift forces with the experimental values which is greater than mine.


Am all out of tries. Is there anything else I can try ?????

Thank you.
vmlxb6 is offline   Reply With Quote

Old   February 2, 2011, 06:13
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,800
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F
ghorrocks is offline   Reply With Quote

Reply

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
accessing lift fore/drag force in UDF changkiang FLUENT 6 May 11, 2015 15:00
Lift force alvio CFX 0 March 12, 2008 18:53
finding drag and lift force Deloat CFX 3 February 27, 2008 17:53
high lift devices at low reynolds Pablo Cornejo FLUENT 0 June 28, 2005 21:35
UDF for lift force on a bluff body sawa FLUENT 2 April 11, 2005 03:06


All times are GMT -4. The time now is 22:24.