Flow Illustrator - a simple windtunnel simulator

[Peakster]

Originally Posted by skyl4rk

So other than being interesting in a lava lamp sort of way, how do you interpret the video to determine what is a lower air resistance?

The idea is to have as little disturbance as possible when the particles leave the shape. Basically a good aerodynamic shape is one where the flow sticks to the object and creates as little of a 'wake' behind it as possible.

[ebacherville]

ok so o was messing around with adaptations of my actual car..

here is the car as it sits now..

YouTube - AreoCRX project wind tunnel sim1

here is with a added bumper..

YouTube - Areocrx with rear bumper

and here is a lower rear angle the rear bottom boattail:

YouTube - areocrx lower rear

i think what i have now looks like it working best?

[ebacherville]

here is basjoos's areocivic:

YouTube - Basjoos's Areocivic Wind tunnel

[ebacherville]

Hmm i made one more trial design.. looks promising..

YouTube - areocrx pointed bumper

[cfg83]

Hello -

Here is a revised version. The Re is 2,500,000, and the time is 40 seconds. All else is default First, I did a stock analysis on my SW2 :

1999 Saturn SW2 Aero-Analysis 2.5MB Re

YouTube - 1999 Saturn SW2 Aero-Analysis 2.5MB Re

After around 6 seconds, a "Virtual Kamm-Back" appears (at least that's what I call it). Then I did an analysis with a Kamm-Back based on MetroMPG's rain-drop example, ending at the bumper :

1999 Saturn SW2 + Kamm-Back Aero-Analysis 2.5MB Re

YouTube - 1999 Saturn SW2 + Kamm-Back Aero-Analysis 2.5MB Re

Finally, I went back to the first analysis and added the "Virtual Kamm-Back" :

1999 Saturn SW2 + Kamm-Back II Aero-Analysis 2.5MB Re

YouTube - 1999 Saturn SW2 + Kamm-Back II Aero-Analysis 2.5MB Re

As I said before, I like the Virtual Kamm-Back because it would mean not having to worry about moving the 3rd brakelight while maintaining almost full rear visibility. It also seemed to compare favorably to the rain-drop Kamm-Back. A nice compromise. I was already thinking along these lines back in February with this image :



Question: Could my Virtual Kamm-Back be "tailored to the program"? What I mean is, could I be making a shape that the program likes?

CarloSW2

[lunarhighway]

one thing about the program is that it's probaly best to test a setup at different speeds!

i think the second value is a mach number? correct me if i'm wrong someone, so you could use some on line converter to convert mph or km/h to mach to test a setup at different speeds

here's my car at about 120km/h the car has a 0.29Cd

YouTube - opel vectra A hatchback in virtual wind tunnel

note the "wigly tail"

[skyl4rk]

I think the height of the vehicle above the ground is very important so that the software can show the correct air pressure at the back coming out from below.

For some reason I am having some trouble getting it to work this morning.

[HyperMiler]

Here is my stock 2006 Kia Rio LX at 55MPH...

HyperMiler's Vehicle

[ebacherville]

Its really interesting to see all these diffrent cars and there performance.. very cool stuff

[donee]

Hi Hyper....,

That shows flow seperation at the top of the C pillar. Might try some tubulators there.