The water entry of decelerating spheres

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

doi:10.1063/1.3309454

The water entry of decelerating spheres

Jeffrey M. Aristoff, Tadd T. Truscott, Alexandra H. Techet, John W.M. Bush

Research output: Contribution to journal › Article › peer-review

222 Scopus citations

Abstract

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. © 2010 American Institute of Physics.

Original language	English (US)
Pages (from-to)	1-8
Number of pages	8
Journal	Physics of Fluids
Volume	22
Issue number	3
DOIs	https://doi.org/10.1063/1.3309454
State	Published - Jan 1 2010
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics

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abstract = "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. {\textcopyright} 2010 American Institute of Physics.",

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AU - Truscott, Tadd T.

AU - Techet, Alexandra H.

AU - Bush, John W.M.

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AB - 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. © 2010 American Institute of Physics.

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The water entry of decelerating spheres

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