Unsteady aerodynamics of two interacting yacht sails in two-dimensional potential flow

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dc.contributor.author Gerhardt, FC en
dc.contributor.author Flay, Richard en
dc.contributor.author Richards, Peter en
dc.date.accessioned 2012-05-27T22:06:43Z en
dc.date.issued 2011 en
dc.identifier.citation JOURNAL OF FLUID MECHANICS 668:551-581 10 Feb 2011 en
dc.identifier.issn 0022-1120 en
dc.identifier.uri http://hdl.handle.net/2292/18624 en
dc.description.abstract In this paper, unsteady thin aerofoil theory is extended to the case of two interacting aerofoils that oscillate harmonically perpendicular to the direction of the incident flow. The two aerofoils represent the headsail and mainsail of a yacht that sails upwind in waves. The developed theory is validated against theoretical data from the literature and results from wind tunnel tests with rigid, high-aspect ratio sail models oscillating at reduced frequencies from k = 0 to k = 0.68. Good agreement is found between the predicted and measured chordwise pressure distributions. An application of the theory to the case of an International America's Cup Class yacht reveals that the time-varying components of the aerodynamic forces are small and that the thrust gain is minimal, i.e. only very little energy can be extracted from the unsteady flow about the sails. No attempt is made to investigate the influence of the flexibility of the sails, three-dimensional effects or phenomena related to dynamic stall. en
dc.publisher Cambridge University Press (CUP) en
dc.relation.ispartofseries Journal of Fluid Mechanics en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0022-1120/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Unsteady aerodynamics of two interacting yacht sails in two-dimensional potential flow en
dc.type Journal Article en
dc.identifier.doi 10.1017/S0022112010004842 en
pubs.begin-page 551 en
pubs.volume 668 en
dc.rights.holder Copyright: Cambridge University Press (CUP) en
pubs.end-page 581 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 220017 en
pubs.org-id Engineering en
pubs.org-id Mechanical Engineering en
pubs.record-created-at-source-date 2011-08-26 en


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