Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-30-2013, 04:35 PM   #1 (permalink)
eco....something or other
 
Join Date: Jul 2009
Location: Colfax, WI
Posts: 724

wood hauler - '91 Ford F-250
Team Pontiac
90 day: 26.69 mpg (US)

Rav - '06 Toyota Rav4 Base
90 day: 26.52 mpg (US)
Thanks: 39
Thanked 67 Times in 50 Posts
boattail mod in flow illustrator

After many, many, many trial runs in flow illustrator, I have this:

Stock form
Click image for larger version

Name:	sunfire stock.jpg
Views:	99
Size:	25.8 KB
ID:	12801

Modded
Click image for larger version

Name:	sunfire tail 4.jpg
Views:	95
Size:	23.0 KB
ID:	12802

I will keep trying to improve it and make it shorter. I will also try my truck and see what I can come up with. Let me know what you think.

__________________



1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-30-2013, 05:28 PM   #2 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 16,326
Thanks: 24,448
Thanked 7,391 Times in 4,786 Posts
think

Quote:
Originally Posted by IsaacCarlson View Post
After many, many, many trial runs in flow illustrator, I have this:

Stock form
Attachment 12801

Modded
Attachment 12802

I will keep trying to improve it and make it shorter. I will also try my truck and see what I can come up with. Let me know what you think.
My apprehension lies with the program being limited to 2-D flow.
Automobiles are bluff bodies in 3-D flow.
I went back and looked at the Japanese Society of Automotive Engineer's paper on the HONDA Dream solar racer.
They used a couple of preliminary programs,one being a turbulence model,to prep the input for the full Navier-Stokes Equation.
The car was reduced to 85,000 wire-frame elements to generate the pressure and drag data.
This is the most sophisticated mathematics I know of.The program is solving an equation of 85,000 variables simultaneously.
When Hucho was at Volkswagen,they would wind tunnel test a model to experience it's wake.After they knew something about the wake,the wake itself was added to became part of the wire-frame CAD model of the car,of which would go back into the CFD program.
I feel that Flow Illustrator is just not powerful enough from which to derive useful data.
Even with massive parallel super-computers,the auto makers must still take full-scale models into the wind tunnel to realize final forms after all the CFD is completed.

__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Reply  Post New Thread






Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com