The analysis of partially separated flow on sail systems using a sectional method

Yacht sail systems are subjected to low speed and transitional flow. Because of the<br/>supporting structure (mast and boom) of the sail system and the curvature of sail<br/>membrane, sail systems also have a partially separated flow.<br/><br/>In this work, it is introduced the sectional method as a sail system flow analysis tool.<br/>The sectional method uses the surface discretization and it is based in the simultaneous<br/>approach for viscous-inviscid interaction but, it works independently to the initial panel<br/>mesh and inviscid panel method calculation, permitting the adjustment of sectional<br/>points to have a better local convergence.<br/><br/>The sectional method is applied to the detection of separated flow regions by means<br/>of integral boundary layer parameters investigation. The investigation is used in cases<br/>of weak separation and strong separation, when analysing mast and sail configurations.<br/>The weak separation detection is applied to a three-dimensional sail shape in a sail<br/>design problem: the study of parameters such as twist and section curvature in order<br/>to control separation on the sail.

Name dc:type.qualificationname

Ph.D.

Level dc:type.qualificationlevel

doctoral

Grantor dc:publisher.institution

University of Southampton

Year dc:date.issued

2006

Author dc:creator

• Veiga, Augusto Elisio Lessa

Advisors dc:contributor.advisor

• Turnock, Stephen
• Wilson, Philip A.
• Molland, A.F.
• Campbell, Ian