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Having previously examined the re-entry characteristics of an X-Wing, a group of engineers are back to look at Imperial vehicle physics. In this poster, they look at what happens to the AT-AT walker when strong crosswinds, like those seen in the Battle of Hoth, blow across the vehicle's path. (Image credit: Y. Yuan et al.)
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Tokyo 2020: Baseball Aerodynamics
For a long time, people thought baseball aerodynamics were simply a competition between gravity and the Magnus effect caused when a ball is spinning. But the seams of a baseball are so prominent that they, too, have a role to play. (Image credit: top - Pixabay, others - B. Smith; research credit: B. Smith; see also Baseball Aerodynamics) Today wraps up our Olympic coverage, but if you missed our earlier posts, you can find them all here. Read the full article
Tokyo 2020: Volleyball Aerodynamics
Like footballs and baseballs, the trajectory of a volleyball is strongly influenced by aerodynamics. When spinning, the ball experiences a difference in pressure on either side, which causes it to swerve, per the Magnus effect. But volleyball also has the float serve, which like the knuckleball in baseball, uses no spin. (Image credit: game - Pixabay, volleyballs - U. Tsukuba; research credit: S. Hong et al., T. Asai et al.; via Ars Technica) Stick around all this week and next for more Olympic-themed fluid physics! Read the full article
Vortex Rings on V-Shaped Walls
Vortex ring impacts are eternally fascinating. Here, researchers explore what happens when a vortex ring encounters a V-shaped wall. (Image and research credit: T. New et al.) Read the full article
Tokyo 2020: Visualizing the Magnus Effect in Golf
Golf returned to the Olympics in 2016 in Rio and is back for the Tokyo edition. Golf balls -- with their turbulence-promoting dimples -- are a perennial favorite for aerodynamics explanations because, counterintuitively, a dimpled golf ball flies farther than a smooth one. But today we're going to focus on a different aspect of golf aerodynamics, namely, what happens when a golf ball is spinning. (Image credit: top - M. Spiske, others - N. Sakib and B. Smith; research credit: N. Sakib and B. Smith, pdf) We're celebrating the Olympics with sports-themed fluid dynamics. Learn how surface roughness affects a volleyball serve, see the wingtip vortices of sail boats, and find out how to optimize rowing oars. And don't forget to come back next week for more! Read the full article
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The speedy shortfin mako shark has a secret weapon to fight drag: bristling denticles that line its fins and tail. (Image credit: mako shark - jidanchaomian, illustration - A. Lang; research credit: A. Lang and A. Lang et al.; submitted by Kam-Yung Soh)
A new micro air vehicle design eschews conventional wisdom in favor of a biological tactic: intentionally disrupting the flow. (Image, video, and research credit: M. Di Luca et al.; via IEEE Spectrum; submitted by Kam-Yung Soh)
Even in an era of supercomputers, there is a place for quick and dirty methods of flow visualization. (Image credit: ARA)
