The water entry of decelerating spheres

被引：230

作者：

Aristoff, Jeffrey M. ^{[1
]}

Truscott, Tadd T. ^{[2
]}

Techet, Alexandra H. ^{[3
]}

Bush, John W. M. ^{[4
]}

机构：

[1] Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA

[2] USN, Undersea Warfare Ctr, Newport, RI 02841 USA

[3] MIT, Dept Mech Engn, Cambridge, MA 02139 USA

[4] MIT, Dept Math, Cambridge, MA 02139 USA

来源：

PHYSICS OF FLUIDS | 2010年 / 22卷 / 03期

基金：

美国国家科学基金会;

关键词：

CAVITY DYNAMICS; SURFACE; DISKS;

D O I：

10.1063/1.3309454

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

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. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3309454]

引用

页码：1 / 8

页数：8

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