Lifting line method for modelling covering and blanketing effects for yacht fleet race simulation


Spenkuch, Thomas, Turnock, Stephen, Scarponi, Matteo and Shenoi, Ajit (2008) Lifting line method for modelling covering and blanketing effects for yacht fleet race simulation. In, 3rd High Performance Yacht Design Conference, Auckland, New Zealand, 02 - 04 Dec 2008. Auckland, New Zealand, Royal Institution of Naval Architects, 111-120.

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Description/Abstract

An approach is presented that can be used to enhance the realism of yacht fleet race simulations. The wake of an upwind sailing yacht is represented as a single heeled horseshoe vortex (and image) system. At each time step changes in vortex strength are convected into the wake as a pair of vortex line elements. These subsequently move in accordance with the local wind, self-induced velocity and velocity induced by the presence of the wakes of other yachts. An empirical based decay factor is used to eventually remove the far wake. A synthesis of sail yacht wake representations based on detailed 3D Reynolds Averaged Navier-Stokes (RANS) Computational Fluid Dynamics (CFD) calculations with wind tunnel test results are used to capture the initial strength of the combined main-jib vortex system and its vertical height. These were based on a typical upwind sail arrangement for a range of heel angles and in-line calculations for a pair of yachts separated by three boat lengths. This paper details the basis of the validated CFD results for a yacht at heel and the analysis of the CFD results to provide an approximate single line vortex method for the yacht. The developed algorithm will eventually run within the Robo-Race which is a real-time yacht race strategy analysis tool based on MATLAB®-Simulink® developed at the University of Southampton.

Item Type: Conference or Workshop Item (Paper)
Keywords: sailing, race simulation, cfd, vortex tracking
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Q Science > QA Mathematics > QA76 Computer software
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Fluid-Structure Interactions
ePrint ID: 64897
Date Deposited: 21 Jan 2009
Last Modified: 27 Mar 2014 18:46
URI: http://eprints.soton.ac.uk/id/eprint/64897

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