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- W2295481143 abstract "We consider the two-dimensional blunt body impact into water with large horizontal speed, where the vertical motion of the body is free. For large horizontal speed of the body, the hydrodynamic loads can be high enough for the body to bounce out of the water without deep penetration of the body through the water surface. This phenomenon was utilised in Wallis’s bouncing bomb (see Johnson, 1998). On the other hand, it can be a hazard for planing high-speed boats (see Faltinsen, 2005) and for the safe landing of aircraft on the water surface. Difficulties arise in the modelling and the computation of such impact processes, not only with identifying the location of the spray root zone but also the position of the water separation from the body surface. To understand the behaviour of the separation point during the oblique impact, simplified models of the phenomenon are required. Although we are aware of the roles of viscosity and surface tension in separation processes, we aim to model separation as inviscid (Sun and Faltinsen, 2007) which is suitable for bodies of large dimensions such as an aircraft fuselage. For oblique impact of a two-dimensional blunt body on the water surface, jets initially occur at the rear and front of the wetted area (see Fig. 1(a)); later the rear jet disappears and the fluid separates from the rear of the body surface (see Fig. 1(b)). We show that before separation starts the hydrodynamic pressure under the body falls below atmospheric pressure. In the absence of any well-established criterion, we consider three possible criteria of inviscid separation and show that the choice changes the body motion significantly." @default.
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- W2295481143 date "2012-01-01" @default.
- W2295481143 modified "2023-10-12" @default.
- W2295481143 title "The bounce of a blunt body from a water surface at high horizontal speed" @default.
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