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

Drag and lift forces monitors

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 4, 2014, 10:03
Default Drag and lift forces monitors
  #1
New Member
 
hannecart
Join Date: Jun 2014
Posts: 16
Rep Power: 4
Isitv2A is on a distinguished road
What fluent calculate when i ask him to monitors drag and lift forces on my cylinder in a flow ?

I was thinking that it was the coefficient but i got high value betwen -15 ...15 my result are sinusoidale like said theory .
Isitv2A is offline   Reply With Quote

Old   July 7, 2014, 03:24
Default
  #2
New Member
 
hannecart
Join Date: Jun 2014
Posts: 16
Rep Power: 4
Isitv2A is on a distinguished road
can anyone tell me if fluent compute the force or the coefficient ?

thanks you
Isitv2A is offline   Reply With Quote

Old   July 7, 2014, 05:29
Default
  #3
New Member
 
Join Date: Mar 2014
Posts: 27
Rep Power: 4
Traction is on a distinguished road
If you set up the reference area in the Reference Values Tab correctly Fluent will show you coefficients.
Traction is offline   Reply With Quote

Old   July 7, 2014, 08:06
Default
  #4
New Member
 
hannecart
Join Date: Jun 2014
Posts: 16
Rep Power: 4
Isitv2A is on a distinguished road
hi traction when i am on lift/drag monitor tab i have to select a wall zone but i don't know wich one is the correct one i got "wall 5" and "wall 5 shadow they correspond to the interface between my cylinder and the water !

my geometry is simple i got a cylinder and around ar square of water . i created for water one face as "amont" (input velocity) , an other "aval " as output pressure . 4 face " wall" as (symetry) . For my cylinder have 3 face "top" (wall) , "bot" (wall) and "interface" but when i go from meshing to fluent , i got (wall15 , wall14 , wall 5 , wall 5shadow , interface_src , inteface_trg ) in adition of the rest in the liste of zone in boundary condition .

when i try to display (wall (14/15/5/5shadow nothing appear) for interface(src et trg i got the wall of my cylinder !

can you explain me wath are the wall(14 15 5 5 shadow )?


thanks !
Isitv2A is offline   Reply With Quote

Old   July 7, 2014, 08:23
Default
  #5
New Member
 
Join Date: Mar 2014
Posts: 27
Rep Power: 4
Traction is on a distinguished road
ok. i misunderstood.
when you are in the force reports tab fluent will show you forces.

fluent should also show your geometry when you setup the display tab correctly. i have no idea why this doesn´t work for you.

which mesher do you use ? do you create named parts while meshing ?
Traction is offline   Reply With Quote

Old   July 7, 2014, 08:35
Default
  #6
New Member
 
hannecart
Join Date: Jun 2014
Posts: 16
Rep Power: 4
Isitv2A is on a distinguished road
i don't really know i just use the one Ansys give me

name meshing with a logo (red circle with white M ) not really precise but i think u know it if u use Ansys .

I have named all my face of my part during meshing .
Isitv2A is offline   Reply With Quote

Old   July 7, 2014, 08:39
Default
  #7
New Member
 
hannecart
Join Date: Jun 2014
Posts: 16
Rep Power: 4
Isitv2A is on a distinguished road
So fluent plot the force on my wall in Newton . Is that correct ?
Isitv2A is offline   Reply With Quote

Old   July 7, 2014, 09:08
Default
  #8
New Member
 
Join Date: Mar 2014
Posts: 27
Rep Power: 4
Traction is on a distinguished road
During calculation Fluent plots coefficients. When your calculation is finished Fluent shows forces when you use the Results / Force Reports Tabs.

If you use SI units the forces are in Newton. Remember that Fluent assumes physical dimensions of your geometry in meters. Regardless of whether your mesh is build in millimeters or something else.
Traction is offline   Reply With Quote

Old   July 7, 2014, 11:02
Default
  #9
New Member
 
hannecart
Join Date: Jun 2014
Posts: 16
Rep Power: 4
Isitv2A is on a distinguished road
Thanks .

well i will work on it because , what fluent plot is not what is expected from theories .


And i will see on CFX-post the force report thanks
Isitv2A 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
drag and lift forces in UDF fluent Isitv2A FLUENT 0 June 27, 2014 11:36
Fluent Drag and Lift monitors shyam88 FLUENT 13 December 9, 2012 01:13
Lattice Boltzmann, LIFT and DRAG forces Puigar Main CFD Forum 0 October 15, 2012 08:57
Measure lift and drag forces in 3D henna07 ANSYS 1 October 17, 2011 16:18
using forces for geting drag and lift force magnitude? 510_ Main CFD Forum 2 October 28, 2010 11:42


All times are GMT -4. The time now is 04:08.