The Proceedings of the Symposium on sports and human dynamics
Online ISSN : 2432-9509
2015
Session ID : D-2
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D-2 A study on the reduction of the wave resistance which occurs around keel-bulb of yacht.
Yuji HATTORIHiroyuki FURUKAWA
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CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract
While the old yacht used only the drag of the wind, the recent yacht uses the lift force generated by both the sail (wing in the air) and the keel-bulb (wing in the water). When the ship heels, the keel-bulb makes the restoration moment and stabilize it. However, the trailing vortex generated from around the keel bulb is a problem. To solve this problem, it is necessary to know about the trailing vortex. In the wind tunnel experiment using particle image velocimetry (PIV), the flow around the keel-bulb is visualized. As a result, when given the angle of attack to the keel-bulb, the bulb rear end is confirmed two vortex larger in behind it, not only identified a single vortex.
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© 2015 The Japan Society of Mechanical Engineers
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