Modelling and Simulation of Seaways in Deep Water for Simulation of Ship Motions

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Authors
  1. McTaggart, K.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
This report presents models of seaways that can be used for simulation of ship motions. The present work assumes deep water, in which ocean wavelength are less than half the water depth. Seaway models are presented for both regular and random wave conditions, and are given in both fixed and translating axis systems. For regular waves, the nonlinear free surface can be modeled suing Stokes second order theory. For both regular and random waves, the influence of the location of the free surface on wave kinematics can be modeled using Wheeler stretching. Commonly used wave spectra and sources of wave climate data are presented as reference information. Sample computation for the frigate HALIFAX illustrate the influence of simulation parameters on predicted RMS motions and required computational time. Required computational time increases significantly when including nonlinear forces from buoyancy and incident waves. In most cases, simulations run faster than real time.

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Keywords
Wave spectra
Report Number
DRDC-ATLANTIC-TM-2003-190 — Technical Memorandum
Date of publication
01 Sep 2003
Number of Pages
52
DSTKIM No
CA023841
CANDIS No
521279
Format(s):
Hardcopy;CD ROM

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