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Originally Posted by Shankenstein
So in the spirit of DIY, has anyone done seen the guys at Ecomodder and their "tuft testing"?
LINK to AutoSpeed
Similar to the wind tunnel tests summarized above, it's a really simple way to visualize flow directions and turbulent spots. Painter's tape + yarn/string + video camera = data. From there, I'm sure we could pinpoint the easiest gains.
Alternatively, I know that we could develop a solid model and run a CFD analysis to get those beautiful clown puke pictures... but at this point, tuft testing is much more accessible to the DIY community. If someone wants to volunteer for CFD duty, I'd be glad to help, but it's beyond my experience.
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It's the old F1/racing way, too.
Another is paint streaks, where a series of dots are painted on the car which then makes a few runs, they then look at the trails left on the car.
Analysts still use a similar technique when they can get pictures of race cars that run in wet conditions. They have very distinct streamlines left on them. They are particularly useful for analyzing inlet effectiveness.