EnSight Rally Car Analysis Part 2

www.ensight.com : EnSight analysis and visualization of CFD model of a Subaru Rally Car. Surface restricted streamlines, vortex core initiated streamlines, Downforce per unit area, and Cp graphs on rear wing illustrate results. Model generated by Aerosim Research Ltd. Solution generated by Metacomp using CFD++. Analysis and visualization by EnSight

Category:

Science & Technology

Tags:

• ensight
• rally
• car
• cfd++
• automotive
• CFD
• simulation
• aerodynamics
• animation

[kevinensight]

No, this is not CATIA. This is CFD post processing software called EnSight. CATIA could be used to generate the surface of the geometry, but then a Meshing/CFD package would be used to obtain the flow solution around the geometry, and then EnSight (shown here) used to visualize, analysis, and animate the results of that flow solution

[pbs520]

Could you do a model to tests the golf ball effect as seen in Mythbusters? I think that the golf ball dimples only need to be placed in strategic areas. Refer to fighter plane vortex generators for insights. The idea is to improve fuel efficiency.

[kevinensight]

You could do CFD on a golf ball. I've seen a few in the past on that subject. I think that due to the generality of the placement/trajectory/incident wind, that the dimples need to be generally located (and thus all around the ball).

[pbs520]

Sorry, I missed a key piece of information. I wanted to do a similar simulation on a CAR, and try to see what size and configuration of golf ball dimples on a CAR may reduce drag. Mythbusters, a tv show on Discovery Channel, showed a 12% fuel efficiency increase when they put golf ball dimples on a car.

[kevinensight]

Ah, yes. Sorry, I missed that aspect! Well, we actually looked at using riblet tape on an F1 car to help reduce drag (looks like shark skin). 3M make a decent size tape for that. Unfortunately, small potatoes compared to everything else.

[soleh773]

very nice..

[BboyChrizCrozz]

What does this all mean.

[daveRobinsonUK1]

is this CATIA?

[pbs520]

Yea, I have heard the rough texture seems to be negligible. I was just wondering if the ratio of dimple to car size was an issue. The dimples used on Mythbusters were fairly large (at least 4 inches diameter). Perhaps there is something to the ratio that impacts Reynold's number (or something similar). Thanks for the info.

[navdrum001]

cool, would have been nice to have some units and values to go with.