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Re: What Is An Overhaul?

Author: Mark Charette
Date: 2006-09-04 02:05

Gordon (NZ) wrote:

> Far more questions than answers, and I suggest taking little
> heed of dogmatism unless it comes from a REAL acoustic expert.

No acoustics expert worth their salt would EVER tell you "what happens when"; rather, they would hypothesize what might happen. I've been privy to lectures by some of the best flow engineers the world, along with Nobel laureates in physics, trying to solve "real" flow problems, and even with today's supercomputers the answers are in the realm of probability only.

Flow engineers take their data from empirical studies and try to formulate mathematical predictions, and then spend most of their lifetimes trying to refine the math. The formulae we use here are accurate in the gross sense (1st order effect), but not in the finer sense (2nd and beyond), and when it comes to edge flow, 2nd and further order effects (separation, eddy, choking, pseudo-chaotic) predominate.

Navier-Stokes is horrid at prediction because of the multiplicity of answers, but good at explaining "after the fact" when the possibilities collapse due to empirical studies.

Which all comes back to the wind instrument makers experimenting to find the different tradeoffs. Science only guides the experiments in particular directions - our measuments and formulae are not yet good enough to come to definite conclusions.

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