Physicists show how patterns can emerge from chaos in turbulent fluids.
The turbulent motion of a tumbling river or the outflow from a jet engine is chaotic: that is, it contains no obvious pattern.
The study, a collaboration between the University of Chicago, Eindhoven University of Technology in the Netherlands, and CNRS, is published March 20 inDespite how much we've learned about classical physics in the past centuries, there's one problem that still resists full explanation: the phenomenon known as turbulence.
However, there are things scientists do know about turbulence. If you shake a bottle of water, you'll see eddies forming. They start out at roughly the size of the length of the bottle; then the eddies split into smaller eddies, and then again into smaller eddies, and so on until the eddies dissipate. This is known as a cascade.
"When we first saw these effects, we didn't fully understand what we were looking at, but you could tell there was something different even to the unaided eye," said study co-author and UChicago Ph.D student Tali Khain."We had to develop a theory to explain it, and that was really exciting." As the scientists work to develop a fuller understanding of their findings, they hope it will lead to a better understanding of the interplay between eddies and waves in turbulent flows.
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