Fuck Yeah Fluid Dynamics

Celebrating the physics of all that flows. Ask a question, submit a post idea or send an email. You can also follow FYFD on Twitter and Google+. FYFD is written by Nicole Sharp, PhD.

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A ball dropped onto a puddle loses some of its rebound momentum to fluid motion.  On impact, a splash curtain and radial jet form as the fluid is displaced by the ball.  As the ball rebounds, the splash curtain is drawn inward into a column of fluid drawn up by the ball, reminiscent of the way cats and dogs drink.  Eventually, when the gravity’s force on the fluid column overcomes the force of the ball’s inertia, the fluid column pinches off and falls back downwards, leaving the ball free to utilize its remaining kinetic energy as it flies upward. (Photo credit: T. Killian, K. Langley, and T. Truscott)

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    A ball dropped onto a puddle loses some of its rebound momentum to fluid motion. On impact, a splash curtain and radial...
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