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 At 3rd High Performance Yacht Design Conference. 02 - 04 Dec 2008. , pp. 111-120.


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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)
Venue - Dates: 3rd High Performance Yacht Design Conference, 2008-12-02 - 2008-12-04
Keywords: sailing, race simulation, cfd, vortex tracking

Organisations: Fluid Structure Interactions Group
ePrint ID: 64897
Date :
Date Event
December 2008Published
Date Deposited: 21 Jan 2009
Last Modified: 16 Apr 2017 17:17
Further Information:Google Scholar

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