On wings and keels (2)
Abstract
The physical mechanisms governing the hydrodynamics of sailing yacht keels and the parameters that, through these mechanisms, determine keel performance are discussed. It is concluded that due to the presence of the free water surface optimum keel shapes differ from optimum shapes for aircraft wings. Utilizing computational fluid dynamics analysis and optimization it is found that the performance of conventional keels can be improved significantly by reducing taper or even applying inverse taper (upside-down keel) and that decisive improvements in performance can be realized through keels with winglets.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- May 1985
- Bibcode:
- 1985STIN...8631847S
- Keywords:
-
- Drag Reduction;
- Hydrodynamics;
- Keels;
- Ship Hulls;
- Wave Drag;
- Free Flow;
- Panel Method (Fluid Dynamics);
- Ships;
- Vorticity;
- Winglets;
- Fluid Mechanics and Heat Transfer