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

Drag coefficient in 2D

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 1, 2009, 02:28
Default Drag coefficient in 2D
  #1
New Member
 
Hadi Hasannudin
Join Date: Apr 2009
Posts: 1
Rep Power: 0
had_hc is on a distinguished road
Hi,
I'm analysing a car's drag using a 2d model. For the frontal area value, because it's a 2D case, i just put the height of the car as the value right which will be in 'm' unit? or should i put the actual frontal area of the car which will be in 'm2' unit?

another thing is the Value of 'Depth' in the Reference Value. I notice that the value influence the total force value (using Report>Forces). What value should i put here? the total height of the car?

thanks in advance
had_hc is offline   Reply With Quote

Old   April 18, 2009, 09:26
Default
  #2
New Member
 
Danial
Join Date: Apr 2009
Posts: 12
Rep Power: 9
ifsibot is on a distinguished road
I would say, considering a cylinder in the flow benchmark, that the area is simply the height of the car (diameter of the cylinder). It is the area that confronts the flow.

I am not used to fluent,.... but if you are doing FSI, the depth is coming from the structural field. Fluid field in fsi is calculated per meter depth, and if you want to have correct forces transferred to structure, your structure should also have 1m as depth.

hope it could help.
ifsibot is offline   Reply With Quote

Old   June 7, 2010, 07:25
Default 2d Aerodynamics
  #3
New Member
 
karthik
Join Date: Aug 2009
Posts: 1
Rep Power: 0
convey2kart is on a distinguished road
Hi

Use Frontal area of the vehicle (m^2) in the Reference value column tab

& For depth use the Car width (m).

The input we give ie; frontal area is used to determine the dynamic force of drag coefficient.

Fluent by default calculates the drag forces per unit width or depth .


Thanks
Regards
Karthik.M
MRV,
Chennai.
convey2kart 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 Coefficient Convergence Problem John FLUENT 16 September 4, 2009 02:44
Drag coefficient for parcels in dieselFoam sebastian_vogl OpenFOAM Running, Solving & CFD 5 December 31, 2008 13:19
Automotive test case vinz OpenFOAM Running, Solving & CFD 98 October 27, 2008 09:43
Energy dissipation and Drag coefficient Freeman Main CFD Forum 10 January 27, 2006 08:42
drag and lift coefficient No CD-adapco 5 July 13, 2004 10:21


All times are GMT -4. The time now is 13:43.