CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FloEFD, FloWorks & FloTHERM

Aerodynamics of an Automobile. (Floworks 2007)

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 13, 2008, 16:11
Default Aerodynamics of an Automobile. (Floworks 2007)
  #1
Nicole Price
Guest
 
Posts: n/a
Hi all,

I've been building and testing 1:1 models in solidworks of an SCCA D-sport Racer for several weeks/months. I've been pretty successful in getting usable relative results (reduced drag and/or increased total downforce), but I am having trouble in one area;

How do I go about setting up my analysis to allow me to determine loads at each tire? I want to be able to see how these increased downforce numbers are effecting my front to rear balance.

The solidworks documention has left things pretty vague to me. Could it be as simple as setting up a 4 seperate goals? (I looked into it, but couldn't find anything I could use as a 'pad' for each wheel).

  Reply With Quote

Old   May 14, 2008, 08:57
Default Re: Aerodynamics of an Automobile. (Floworks 2007)
  #2
Dani
Guest
 
Posts: n/a
Yes, simply apply a surface goal on the surfaces of each tire and select the parameters of the goals. It is that simple. The goal then shows for example the forces or moments acting on these surfaces. What you cannot do is determine how much downforce the front wing is causing on the left or the right tire because the goal only gives you the forces of the fluid acting on the selected surfaces. If you want to know the force of the front wing on each tire, you will have to go by hand calculation of the simple mechanics or use COSMOSworks. Because in EFD or Floworks there is no mechanical translation of forces acting on one point to the other point.
  Reply With Quote

Old   May 15, 2008, 20:48
Default Well that blows... So I was sold a bag of garbage?
  #3
Nicole Price
Guest
 
Posts: n/a
How would Cosmosworks be able to help me determine the total loads transfered to the contact patch of each tire due to aerodynamic drags and forces?

This is terribly rediculous if this is true. My solidworks reseller is of no use. All he says is that 'anything is possible with solidworks!'

Your answer also does not make total sense, as I can get cosmos to give me total down force and total drag of my models.
  Reply With Quote

Old   May 16, 2008, 14:45
Default Re: Well that blows... So I was sold a bag of garb
  #4
Bill McEachern
Guest
 
Posts: n/a
Just 'cause some guy named Dani makes a post doesn't mean you need to go get all non-linear on us now.....

It has been awhile since I did this but I am pretty sure you can sum all or any the forces & torques acting on a particular surface relative to a co-ordinate system. You can then figure it out pretty simply with all the moments referenced to a single location. No big deal. You need to sum the "torques" on a surface about a known location (coordinate system) and if you know the lift then getting the center of lift is not that tough given you know the moment and the lift. Obviously, with the locations of the centers of lift you can figure out the load per tire with some sigma F=0. Hope that helps.
  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
Solving a NACA0010 in Floworks magicroot FloEFD, FloWorks & FloTHERM 1 March 23, 2011 07:18
Cross Axial Rotation problems with FloWorks jacobjb FloEFD, FloWorks & FloTHERM 2 March 8, 2010 15:20
New dedicated forum for EFD and FloWorks users Forum Administrator Main CFD Forum 6 April 15, 2008 11:56
Consultant w/ Expertise in Aerodynamics & CFD Philip Sorensen FLUENT 0 February 19, 2007 14:45
Floworks & Aero BW Malcolm Main CFD Forum 1 June 7, 2004 15:44


All times are GMT -4. The time now is 21:08.