Spenkuch, Thomas, Turnock, Stephen, Scarponi, Matteo and Shenoi, Ajit
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.
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.
Conference or Workshop Item
|Venue - Dates:
||3rd High Performance Yacht Design Conference, 2008-12-02 - 2008-12-04
||sailing, race simulation, cfd, vortex tracking
||Fluid Structure Interactions Group
||21 Jan 2009
||16 Apr 2017 17:17
|Further Information:||Google Scholar|
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