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

Lifting line method for modelling covering and blanketing effects for yacht fleet race simulation
Lifting line method for modelling covering and blanketing effects for yacht fleet race simulation
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.
sailing, race simulation, cfd, vortex tracking
111-120
Spenkuch, Thomas
e3503eb2-77ee-4b85-906f-2c89d96ee5f5
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Scarponi, Matteo
c4842e25-7ac0-4b81-b68a-0cb57032c6bf
Shenoi, Ajit
a37b4e0a-06f1-425f-966d-71e6fa299960
Spenkuch, Thomas
e3503eb2-77ee-4b85-906f-2c89d96ee5f5
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Scarponi, Matteo
c4842e25-7ac0-4b81-b68a-0cb57032c6bf
Shenoi, Ajit
a37b4e0a-06f1-425f-966d-71e6fa299960

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

Record type: Conference or Workshop Item (Paper)

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.

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More information

Published date: December 2008
Venue - Dates: 3rd High Performance Yacht Design Conference, Auckland, New Zealand, 2008-12-02 - 2008-12-04
Keywords: sailing, race simulation, cfd, vortex tracking
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 64897
URI: http://eprints.soton.ac.uk/id/eprint/64897
PURE UUID: 11da02fb-e80d-4f9d-9090-208ee5f07e10
ORCID for Stephen Turnock: ORCID iD orcid.org/0000-0001-6288-0400

Catalogue record

Date deposited: 21 Jan 2009
Last modified: 09 Jan 2022 02:37

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Contributors

Author: Thomas Spenkuch
Author: Stephen Turnock ORCID iD
Author: Matteo Scarponi
Author: Ajit Shenoi

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