A theoretical and numerical procedure for predicting sailing yacht lift and drag

In this thesis, a theoretical and numerical procedure for predicting the effects of viscosity on the hydrodynamic forces developed by a sailing yacht hull is presented. A simultaneous viscous/inviscid algorithm is developed by coupling a low order panel method with quasi three-dimensional integral boundary layer equations. A transom condition is used to prevent non-zero wave heights at the stern for a hull with overhangs. The influence of viscosity on the outer inviscid flow is modeled using a wall transpiration boundary condition and an edge velocity formula. The boundary layer edge velocity is expressed as a sum of the inviscid velocities and a correction dependent only on the boundary layer variables, determined by equations developed from the panel method calculation as a distribution of transpiration sources. These are superimposed on the body, including the lifting surfaces, as well as on the potential flow wakes. The boundary layer equations, with the global potential flow effects included via the transpiration source model, are solved by a full Newton's method. Numerical predictions for a sailing yacht hull are compared with experimental results obtained in a towing tank.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2007

Author dc:creator

• Cairoli, Claudio, 1975-

Advisor dc:contributor.advisor

• Jerome J. Milgram.

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/38699

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/38699