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Modelling and Simulation in Engineering
Volume 2011, Article ID 356741, 10 pages
http://dx.doi.org/10.1155/2011/356741
Research Article

A Fully Nonlinear, Dynamically Consistent Numerical Model for Ship Maneuvering in a Seaway

1Hydromechanics Department, David Taylor Model Basin, NSWCCD, 9500 MacArthur Boulevard, West Bethesda, MD 20817-5700, USA
2Planetary Geodynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA

Received 28 March 2011; Accepted 19 July 2011

Academic Editor: Agostino Bruzzone

Copyright © 2011 Ray-Qing Lin and Weijia Kuang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This is the continuation of our research on development of a fully nonlinear, dynamically consistent, numerical ship motion model (DiSSEL). In this paper we report our results on modeling ship maneuvering in arbitrary seaway that is one of the most challenging and important problems in seakeeping. In our modeling, we developed an adaptive algorithm to maintain dynamical balances numerically as the encounter frequencies (the wave frequencies as measured on the ship) varying with the ship maneuvering state. The key of this new algorithm is to evaluate the encounter frequency variation differently in the physical domain and in the frequency domain, thus effectively eliminating possible numerical dynamical imbalances. We have tested this algorithm with several well-documented maneuvering experiments, and our results agree very well with experimental data. In particular, the numerical time series of roll and pitch motions and the numerical ship tracks (i.e., surge, sway, and yaw) are nearly identical to those of experiments.