Wave Effect On The Trajectory Of A High-speed
Rigid Body In A Water Column
Author(s)
P. C. Chu & C. Fan
Abstract
Waves form when the water surface is disturbed, for example, by wind or
gravitational forces. During such disturbances energy and momentum are
transferred to the water mass and sea-state is changed. For shallow water
regions, the bottom topography affects the waves dramatically. Waves may cause
an evident slant of the ocean surface with a large inclination angle of about 55o.
When a high-speed rigid body strikes the wavy ocean surface, the random ocean
slope largely affects its underwater trajectory. Identification of such an effect is
a key point in the prediction of a fast moving rigid body in a water column. The
probability density equation (PDF) of the ocean wave slopes was used to
generate the stochastic surface slope. A 6-degree of freedom (DOF) model of a
fast-moving rigid body is used with the stochastic sloping surface as its waterentry
condition. The PDFs of the body location and orientation are obtained
from results of 6-DOF model runs. From temporal change of these PDFs, the
wave effect on the trajectory of a high-speed underwater rigid body has been
identified.
Keywords: body-flow interaction, 3D bomb trajectory prediction, 6-DOF model,
STRIKE35, random waves, probability density function.
1 Introduction
Movement of a fast-moving rigid body such as a bomb through a water column
has been studied recently [1–3]. These studies have been motivated by a new
concept of using a general purpose bomb such as the Mk-84 for mine/maritime
improvised explosive device (IED) clearance in order to reduce the risk to
Keywords
body-flow interaction, 3D bomb trajectory prediction, 6-DOF model,
STRIKE35, random waves, probability density function
Related Book
Other papers in this volume
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