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

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 11-27-2020, 10:17 PM   #1 (permalink)
Master EcoModder
JulianEdgar's Avatar
Join Date: Nov 2017
Location: Australia
Posts: 1,968
Thanks: 106
Thanked 1,542 Times in 1,094 Posts
Understanding separated and attached flows

From what I see people write, I think that there may be some confusion here as to the significance of attached and separated flows (eg it doesn't seem often stated that attached flow can cause drag, and attached flow can cause thrust).

Modern car shapes basically have attached flow (on the upper surfaces at least) from nose to tail, so understanding the forces it develops is a great help to understanding current car aero.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 12-02-2020, 11:13 AM   #2 (permalink)
Aero Wannabe
COcyclist's Avatar
Join Date: Dec 2007
Location: NW Colo
Posts: 692

TDi - '04 VW Golf
90 day: 47.98 mpg (US)
Thanks: 615
Thanked 194 Times in 152 Posts
Thanks for posting this. Watching the video reminded me of the Dave Heinrich diagram of the New Beetle I first saw in an old AutoSpeed article and the tuft test photos in your book on page 65. It shows attached flow all the way down the back hatch and a terrible drag coefficient of 0.39 for the New Beetle.

60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun

Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
  Reply With Quote
The Following User Says Thank You to COcyclist For This Useful Post:
JulianEdgar (12-07-2020)
Reply  Post New Thread

Thread Tools

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com