EnSight Rally Car Analysis Part 2

[soleh773]

very nice..

[BboyChrizCrozz]

What does this all mean.

[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

[daveRobinsonUK1]

is this CATIA?

[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.

[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.

[SpeedDemon10001]

Very nice. I'm an aerospace engineer interested in rally racing.

[Sidowse]

Very nice. I'm a Cleaner that is interested in rally racing.

[SpeedDemon10001]

You're my HERO! :)

[Sidowse]

Well you have to have a clean car so as not to disrupt (unnecessarily) the venturi-effects. Nasty vortex-shedding off the back-end though.

[G4Vegan]

first