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A time-domain simulation for predicting the downwind performance of yachts in waves

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Harris, D and Thomas, GA and Renilson, MR (2001) A time-domain simulation for predicting the downwind performance of yachts in waves. In: The Fifteenth Chesapeake Sailing Yacht Symposium, Annapolis, Maryland, USA.

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Abstract

Yachts racing in many of today's high profite races,
such as the America's Cup and the Volvo Ocean
Race, spend much time sailing downwind in
following seas. The development of a method for
predicting the performance of yachts sailing
downwind in waves would therefore provide a
valuable design tool for racing yacht designers.
This paper describes the development of a timedomain
simulation for predicting the performance of
yachts sailing in irregular seas for apparent wind
angles between 90 and 180 degrees. The simulation
output may be used to either directly compare
different designs or augment existing polar plots for the effect of a following sea.
The simulation is comprised of three main modules:
the wave induced longitudinal force, the resistance
force and the sail aerodynamic force. The resistance
and wave force modules have been validated through
semi-captive model experiments. Results from the
complete simulation have been compared with those
obtained from free running model experiments.
Numerical experiments on a number of hull and rig
configurations have been conducted using the
simulation. Results are presented with conclusions
being drawn on the effect of hull form and
environmental conditions on downwind performance.

Item Type: Conference or Workshop Item (Paper)
Date Deposited: 12 Dec 2007 00:13
Last Modified: 18 Nov 2014 03:25
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