Generation of Three-Dimensional Fully Nonlinear Water Waves by a Submerged Moving Object
Publication: Journal of Engineering Mechanics
Volume 137, Issue 2
Abstract
This paper describes a numerical investigation on the generation of three-dimensional (3D) fully nonlinear water waves by a submerged object moving at speeds varied from subcritical to supercritical conditions in an unbounded fluid domain. Considering a semispheroid as the moving object, simulations of the time evolutions of 3D free-surface elevation and flow field are performed. The present 3D model results are found to agree reasonably well with other published vertical two-dimensional (2D) and quasi-3D numerical solutions using Boussinesq-type models. Different from the 2D cases with near critical moving speeds, the 3D long-term wave pattern suggests that in addition to the circularly expanded upstream advancing solitonlike waves, a sequence of divergent and transverse waves are also developed behind the moving object. The velocity distributions and associated fluid-particle trajectories at the free-surface and middle layers are presented to show the 3D feature of the motion. The results under various vertical positions (referred as gap) of a moving object are also compared. It is found the gap has shown a substantial influence on the generated waves, especially in the wake region, when an object moves at a near critical or subcritical speed. However, the results under the case with a high supercritical moving speed indicate the gap has a negligible effect on the generated upstream and downstream waves.
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Acknowledgments
This research was supported by the National Science Council, Taiwan, under Contract No. NSCTNSC 98-2221-E-275-007.
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Published In
Journal of Engineering Mechanics
Volume 137 • Issue 2 • February 2011
Pages: 101 - 112
Copyright
© 2011 ASCE.
History
Received: Jan 26, 2010
Accepted: Aug 2, 2010
Published online: Aug 4, 2010
Published in print: Feb 2011
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