You notice the strangest things about fluid motion if you're paying attention to nature. This, for instance:
No prize for guessing what's happening (or why), of course, but I would sure like to simulate this on my box once I get back to college. As of now, I'm trying to compute the frequency of oscillation based purely on order of magnitudes of the flow parameters. (The Rayleigh, Reynolds, and Strouhal numbers, to be precise. Perhaps the Froude number as well- I don't know yet.)
And then this, which doesn't look like much here, but was mesmerizing when I saw it happen:
Reflected and incident waves interfering to create slinky like seemingly transverse waves. A deception, of course- I know there's a considerable longitudinal component to surface waves in water, and I think there's a considerable longitudinal component to the resultant here, as well. This was, by the way, at the lake here.
Weird, eh?
2 comments:
that IS weird. but amazing at the same time. but didn't Feynman say that they still can't properly define turbulent flow? but you seem to be doing a lot of interesting things.
Turbulence has little to do with the phenomena seen in the videos.
The oscillating vessel is a sight to behold- and has more to do with bubble formation than with turbulence.
The standing waves are almost opposite in phase, which is to be expected from a reflection off a wall. Its just not something you see often with surface waves in water, though. (Not really sure, since I couldn't find a bob to throw in the water.)
Feynman did say something of the kind about turbulence, but that was ~1962. (Forty five years ago!) People have ways of handling and predicting turbulent flows these days, although they don't understand it much better than they used to.
( And the weird = amazing tautology was assumed when I composed the post! )
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