Journal
JOURNAL OF FLUID MECHANICS
Volume 695, Issue -, Pages 310-320Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2012.20
Keywords
bubble dynamics; gas/liquid flows
Categories
Funding
- EPSRC [EP/E027814/1]
- Nuffield foundation in the UK [NAL/32574]
- Departments of RAS [2.14.2]
- Russian Government [11.G34.31.0035]
- Engineering and Physical Sciences Research Council [EP/E027814/1] Funding Source: researchfish
- EPSRC [EP/E027814/1] Funding Source: UKRI
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An experimental and theoretical investigation of the air trapping by a blunt, locally spherical body impacting onto the free surface of water is conducted. In the parameter regime previously studied theoretically by Hicks & Purvis (J. Fluid Mech., vol. 649, 2010, pp. 135-163), excellent agreement between experimental data and theoretical modelling is obtained. Earlier predictions of the radius of the trapped air pocket are confirmed. A boundary element method is used to consider air cushioning of an impact of an axisymmetric body into water. Efficient computational methods are obtained by analytically integrating the boundary integral equation over the azimuthal variable. The resulting numerically computed free-surface profiles predict an annular touchdown region in excellent agreement with the experiments.
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