Hydrodynamic Forces and Motions in the Time Domain for an Unappended Ship Hull

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Authors
  1. McTaggart, K.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
This report describes numerical predictions of hydrodynamic forces and motions in the time domain for an unappended ship hull in waves. The hydrodynamic forces in the time domain are evaluated using previously computed values in the frequency domain, which are based on the three-dimensional Green function for a body with zero forward speed. Forward speed effects are included in both the frequency and time domains using suitable approximations. Due to the underlying importance of numerical predictions of hydrodynamic forces in the frequency domain, attention has been given to their accuracy, robustness, and efficiency. Comparisons between motion predictions in the frequency and time domains show excellent agreement, suggesting correct theoretical and numerical implementations. Comparisons of numerical heave and pitch predictions with model test data for the frigate HALIFAX show very good agreement. Time domain simulations of ship motion execute significantly faster than real time, indicating that the approach will be practical for modelling and simulation applications.

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Keywords
Surge;Sway;Time domain;HMCS Halifax;Frequency domain
Report Number
DRDC-ATLANTIC-TM-2003-104 — Technical Memorandum
Date of publication
01 May 2003
Number of Pages
88
DSTKIM No
CA023132
CANDIS No
520332
Format(s):
CD ROM

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