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Ya know what grabbed my attention in FreeBeards video thing, the computing power required to squiggle the smoke rings and make the pretty designs.
It took 4,096 CPU's working together to simulate the flow.........
To me this means any kind of computer flow calculations regarding flow around a vehicle, airplane, tree, garden gnome, or anything else is suspect. A single parameter in the computer programming being out by a fraction of a percent is compounded 4,096 times. Computers may be a good tool to rough in aerodynamic stuff, but can't be relied upon for real world performance. The complex interactions of fluid around a moving body are truly mind boggling and extend out many yards from the surface of the object in question, so even tuft testing really only provides a miniscule insight on the total picture since it is looking at what is going on in the 1st 1/2" or so of the air movement.
Testing results from wind tunnels and careful ABA testing, to me, are the ways we can have faith in what represents reality.
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