ANZIAM  J.  45 (2003), 1-15
A flat ship theory on bow and stern flows

Songping Zhu
  School of Mathematics and Applied Statistics
  The University of Wollongong
  Wollongong NSW 2522
Yinglong Zhang
  Center for Coastal and Land-Margin Research
  Department of Environmental Science and Engineering
  Oregon Graduate Institute of Science and Technology
  Beaverton OR 97006

An analytical solution of a two-dimensional bow and stern flow model based on a flat ship theory is presented for the first time. The flat ship theory is a counterpart to Michell's thin ship theory and leads to a mixed initial-boundary value problem, which is usually difficult to solve analytically. Starting from the transient problem, we shall first show that a steady state is attainable at the large time limit. Then the steady problem is solved in detail by means of the Wiener-Hopf technique and closed-form far-field results are obtained for an arbitrary hull shape. Apart from providing a better understanding of the underlying physics, the newly found analytical solution has shed some light on solving a longtime outstanding problem in the engineering practice of ship building, the optimisation of hull shape.
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