Minimising wave drag for free surface flow past a two-dimensional stern
Ogilat, Osama, McCue, Scott W., Turner, Ian W., Belward, John A., & Binder, Benjamin J. (2011) Minimising wave drag for free surface flow past a two-dimensional stern. Physics of Fluids, 23(7), 072101-1.
Free surface flow past a two-dimensional semi-infinite curved plate is considered, with emphasis given to solving for the shape of the resulting wave train that appears downstream on the surface of the fluid. This flow configuration can be interpreted as applying near the stern of a wide blunt ship. For steady flow in a fluid of finite depth, we apply the Wiener-Hopf technique to solve a linearised problem, valid for small perturbations of the uniform stream. Weakly nonlinear results found using a forced KdV equation are also presented, as are numerical solutions to the fully nonlinear problem, computed using a conformal mapping and a boundary integral technique. By considering different families of shapes for the semi-infinite plate, it is shown how the amplitude of the waves can be minimised. For plates that increase in height as a function of the direction of flow, reach a local maximum, and then point slightly downwards at the point at which the free surface detaches, it appears the downstream wavetrain can be eliminated entirely.
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|Item Type:||Journal Article|
|Keywords:||free surface flow, Wiener-Hopf technique, forced KdV equation, boundary integral method, waves|
|Subjects:||Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > APPLIED MATHEMATICS (010200) > Approximation Theory and Asymptotic Methods (010201)
Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > APPLIED MATHEMATICS (010200) > Theoretical and Applied Mechanics (010207)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > Mathematical Sciences
|Copyright Owner:||Copyright 2011 The Authors & American Institute of Physics|
|Copyright Statement:||This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.|
|Deposited On:||19 Jun 2011 21:53|
|Last Modified:||22 Jul 2011 06:00|
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