<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>UTas ePrints - A time-domain simulation for predicting the downwind performance of yachts in waves</title> <script type="text/javascript" src="http://eprints.utas.edu.au/javascript/auto.js"><!-- padder --></script> <style type="text/css" media="screen">@import url(http://eprints.utas.edu.au/style/auto.css);</style> <style type="text/css" media="print">@import url(http://eprints.utas.edu.au/style/print.css);</style> <link rel="icon" href="/images/eprints/favicon.ico" type="image/x-icon" /> <link rel="shortcut icon" href="/images/eprints/favicon.ico" type="image/x-icon" /> <link rel="Top" href="http://eprints.utas.edu.au/" /> <link rel="Search" href="http://eprints.utas.edu.au/cgi/search" /> <meta content="Harris, Dougal" name="eprints.creators_name" /> <meta content="Thomas, Giles A." name="eprints.creators_name" /> <meta content="Renilson, Martin R" name="eprints.creators_name" /> <meta name="eprints.creators_id" /> <meta content="giles@amc.edu.au" name="eprints.creators_id" /> <meta name="eprints.creators_id" /> <meta content="conference_item" name="eprints.type" /> <meta content="2007-12-12 00:13:35" name="eprints.datestamp" /> <meta content="2008-02-03T23:54:42Z" name="eprints.lastmod" /> <meta content="show" name="eprints.metadata_visibility" /> <meta content="A time-domain simulation for predicting the downwind performance of yachts in waves" name="eprints.title" /> <meta content="pub" name="eprints.ispublished" /> <meta content="291202" name="eprints.subjects" /> <meta content="291201" name="eprints.subjects" /> <meta content="public" name="eprints.full_text_status" /> <meta content="paper" name="eprints.pres_type" /> <meta content="Yachts racing in many of today's high profite races, such as the America's Cup and the Volvo Ocean Race, spend much time sailing downwind in following seas. The development of a method for predicting the performance of yachts sailing downwind in waves would therefore provide a valuable design tool for racing yacht designers. This paper describes the development of a timedomain simulation for predicting the performance of yachts sailing in irregular seas for apparent wind angles between 90 and 180 degrees. The simulation output may be used to either directly compare different designs or augment existing polar plots for the effect of a following sea. The simulation is comprised of three main modules: the wave induced longitudinal force, the resistance force and the sail aerodynamic force. The resistance and wave force modules have been validated through semi-captive model experiments. Results from the complete simulation have been compared with those obtained from free running model experiments. Numerical experiments on a number of hull and rig configurations have been conducted using the simulation. Results are presented with conclusions being drawn on the effect of hull form and environmental conditions on downwind performance." name="eprints.abstract" /> <meta content="2001-01" name="eprints.date" /> <meta content="published" name="eprints.date_type" /> <meta content="10" name="eprints.pages" /> <meta content="The Fifteenth Chesapeake Sailing Yacht Symposium" name="eprints.event_title" /> <meta content="Annapolis, Maryland, USA" name="eprints.event_location" /> <meta content="conference" name="eprints.event_type" /> <meta content="TRUE" name="eprints.refereed" /> <meta content="Harris, Dougal and Thomas, Giles A. and Renilson, Martin R (2001) A time-domain simulation for predicting the downwind performance of yachts in waves. In: The Fifteenth Chesapeake Sailing Yacht Symposium, Annapolis, Maryland, USA." name="eprints.citation" /> <meta content="http://eprints.utas.edu.au/2484/1/harris_downwind_waves_chesapeake_2001%5B1%5D.pdf" name="eprints.document_url" /> <link rel="schema.DC" href="http://purl.org/DC/elements/1.0/" /> <meta content="A time-domain simulation for predicting the downwind performance of yachts in waves" name="DC.title" /> <meta content="Harris, Dougal" name="DC.creator" /> <meta content="Thomas, Giles A." name="DC.creator" /> <meta content="Renilson, Martin R" name="DC.creator" /> <meta content="291202 Ship and Platform Hydrodynamics" name="DC.subject" /> <meta content="291201 Naval Architecture" name="DC.subject" /> <meta content="Yachts racing in many of today's high profite races, such as the America's Cup and the Volvo Ocean Race, spend much time sailing downwind in following seas. The development of a method for predicting the performance of yachts sailing downwind in waves would therefore provide a valuable design tool for racing yacht designers. This paper describes the development of a timedomain simulation for predicting the performance of yachts sailing in irregular seas for apparent wind angles between 90 and 180 degrees. The simulation output may be used to either directly compare different designs or augment existing polar plots for the effect of a following sea. The simulation is comprised of three main modules: the wave induced longitudinal force, the resistance force and the sail aerodynamic force. The resistance and wave force modules have been validated through semi-captive model experiments. Results from the complete simulation have been compared with those obtained from free running model experiments. Numerical experiments on a number of hull and rig configurations have been conducted using the simulation. Results are presented with conclusions being drawn on the effect of hull form and environmental conditions on downwind performance." name="DC.description" /> <meta content="2001-01" name="DC.date" /> <meta content="Conference or Workshop Item" name="DC.type" /> <meta content="PeerReviewed" name="DC.type" /> <meta content="application/pdf" name="DC.format" /> <meta content="http://eprints.utas.edu.au/2484/1/harris_downwind_waves_chesapeake_2001%5B1%5D.pdf" name="DC.identifier" /> <meta content="Harris, Dougal and Thomas, Giles A. and Renilson, Martin R (2001) A time-domain simulation for predicting the downwind performance of yachts in waves. 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border: solid 1px #ccc; padding: 3px"><tr> <td align="left"><a href="http://eprints.utas.edu.au/cgi/users/home">Login</a> | <a href="http://eprints.utas.edu.au/cgi/register">Create Account</a></td> <td align="right" style="white-space: nowrap"> <form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/search" style="display:inline"> <input class="ep_tm_searchbarbox" size="20" type="text" name="q" /> <input class="ep_tm_searchbarbutton" value="Search" type="submit" name="_action_search" /> <input type="hidden" name="_order" value="bytitle" /> <input type="hidden" name="basic_srchtype" value="ALL" /> <input type="hidden" name="_satisfyall" value="ALL" /> </form> </td> </tr></table></td></tr> <tr> <td class="toplinks"><!-- InstanceBeginEditable name="content" --> <div align="center"> <table width="720" class="ep_tm_main"><tr><td align="left"> <h1 class="ep_tm_pagetitle">A time-domain simulation for predicting the downwind performance of yachts in waves</h1> <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Harris, Dougal</span> and <span class="person_name">Thomas, Giles A.</span> and <span class="person_name">Renilson, Martin R</span> (2001) <xhtml:em>A time-domain simulation for predicting the downwind performance of yachts in waves.</xhtml:em> In: The Fifteenth Chesapeake Sailing Yacht Symposium, Annapolis, Maryland, USA.</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_3264' );" href="http://eprints.utas.edu.au/2484/1/harris_downwind_waves_chesapeake_2001%5B1%5D.pdf" onmouseout="EPJS_HidePreview( event, 'doc_preview_3264' );"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a><div class="ep_preview" id="doc_preview_3264"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/2484/thumbnails/1/preview.png" class="ep_preview_image" border="0" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/2484/1/harris_downwind_waves_chesapeake_2001%5B1%5D.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />501Kb</td></tr></table><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Yachts racing in many of today's high profite races, such as the America's Cup and the Volvo Ocean Race, spend much time sailing downwind in following seas. The development of a method for predicting the performance of yachts sailing downwind in waves would therefore provide a valuable design tool for racing yacht designers. This paper describes the development of a timedomain simulation for predicting the performance of yachts sailing in irregular seas for apparent wind angles between 90 and 180 degrees. The simulation output may be used to either directly compare different designs or augment existing polar plots for the effect of a following sea. The simulation is comprised of three main modules: the wave induced longitudinal force, the resistance force and the sail aerodynamic force. The resistance and wave force modules have been validated through semi-captive model experiments. Results from the complete simulation have been compared with those obtained from free running model experiments. Numerical experiments on a number of hull and rig configurations have been conducted using the simulation. Results are presented with conclusions being drawn on the effect of hull form and environmental conditions on downwind performance.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Conference or Workshop Item (Paper)</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/291202.html">290000 Engineering and Technology > 291200 Maritime Engineering > 291202 Ship and Platform Hydrodynamics</a><br /><a href="http://eprints.utas.edu.au/view/subjects/291201.html">290000 Engineering and Technology > 291200 Maritime Engineering > 291201 Naval Architecture</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2484</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Giles Thomas</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">12 Dec 2007 11:13</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">04 Feb 2008 10:54</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2484;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=2484">item control page</a></p> </td></tr></table> </div> <!-- InstanceEndEditable --></td> </tr> <tr> <td><!-- #BeginLibraryItem "/Library/footer_eprints.lbi" --> <table width="795" border="0" align="left" cellpadding="0" class="footer"> <tr valign="top"> <td colspan="2"><div align="center"><a href="http://www.utas.edu.au">UTAS home</a> | <a href="http://www.utas.edu.au/library/">Library home</a> | <a href="/">ePrints home</a> | <a href="/contact.html">contact</a> | <a href="/information.html">about</a> | <a href="/view/">browse</a> | <a href="/perl/search/simple">search</a> | <a href="/perl/register">register</a> | <a href="/perl/users/home">user area</a> | <a href="/help/">help</a></div><br /></td> </tr> <tr><td colspan="2"><p><img src="/images/eprints/footerline.gif" width="100%" height="4" /></p></td></tr> <tr valign="top"> <td width="68%" class="footer">Authorised by the University Librarian<br /> © University of Tasmania ABN 30 764 374 782<br /> <a href="http://www.utas.edu.au/cricos/">CRICOS Provider Code 00586B</a> | <a href="http://www.utas.edu.au/copyright/copyright_disclaimers.html">Copyright & Disclaimers</a> | <a href="http://www.utas.edu.au/accessibility/index.html">Accessibility</a> | <a href="http://eprints.utas.edu.au/feedback/">Site Feedback</a> </td> <td width="32%"><div align="right"> <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><img src="http://www.utas.edu.au/shared/logos/unioftasstrip.gif" alt="University of Tasmania Home Page" width="260" height="16" border="0" align="right" /></a></p> <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><br /> </a></p> </div></td> </tr> <tr valign="top"> <td><p> </p></td> <td><div align="right"><span class="NoPrint"><a href="http://www.eprints.org/software/"><img src="/images/eprintslogo.gif" alt="ePrints logo" width="77" height="29" border="0" align="bottom" /></a></span></div></td> </tr> </table> <!-- #EndLibraryItem --> <div align="center"></div></td> </tr> </table> </body> </html>