Andrew Paul is Popular Science‘s staff writer covering tech news. Previously, he was a regular contributor to The A.V. Club and Input, and has had recent work featured by Rolling Stone, Fangoria, GQ, Slate, NBC, as well as McSweeney’s Internet Tendency. He lives outside Indianapolis.
Sharks and owls are evolutionarily optimized in surprisingly similar ways. When it comes to the ocean’s apex predator, their skin’s textured patterns, known as riblets, help cut down on drag. With owls, their tiny feather ridges called serrations allow them to fly silently while hunting prey.
Of these variations, the rectangular form showed the most promising results in choppy water—reducing noise by over 14-percent alongside a roughly 5 percent reduction in drag. When the riblets were finer and closer to one another, drag could be reduced by as much as an additional 25 percent. These simulations not only showcased potential riblet patterns for sonar casings, but also illuminated new fluid dynamics that underpin noise reduction during turbulent water flows.
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