The water entry of decelerating spheres | Zendy

Jeffrey M. Aristoff | Zendy; Tadd Truscott | Zendy; Alexandra H. Techet | Zendy; John W. M. Bush | Zendy

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The water entry of decelerating spheres

Author(s) -

Jeffrey M. Aristoff,

Tadd Truscott,

Alexandra H. Techet,

John W. M. Bush

Publication year - 2010

Publication title -

physics of fluids

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.188

H-Index - 180

eISSN - 1089-7666

pISSN - 1070-6631

DOI - 10.1063/1.3309454

Subject(s) - physics , spheres , mechanics , classical mechanics , pinch , volume (thermodynamics) , thermodynamics , astronomy , nuclear physics

We present the results of a combined experimental and theoretical investigation of the vertical impact of low-density spheres on a water surface. Particular attention is given to characterizing the sphere dynamics and the influence of its deceleration on the shape of the resulting air cavity. A theoretical model is developed which yields simple expressions for the pinch-off time and depth, as well as the volume of air entrained by the sphere. Theoretical predictions compare favorably with our experimental observations, and allow us to rationalize the form of water-entry cavities resulting from the impact of buoyant and nearly buoyant spheres.National Science Foundation (U.S.) (Grant No. CTS-0624830)National Science Foundation (U.S.). Graduate Fellowship ProgramUnited States. Office of Naval Research (Grant No. N00014-06-1-0445

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