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Boundary between unsteady and overturning ship bow wave regimes

Published online by Cambridge University Press:  10 February 2009

GÉRARD DELHOMMEAU ,
MICHEL GUILBAUD ,
LAURENT DAVID ,
CHI YANG  and
FRANCIS NOBLESSE
GÉRARD DELHOMMEAU
Affiliation:
Laboratoire de Mécanique des Fluides, École Centrale de Nantes, CNRS, France
MICHEL GUILBAUD
Affiliation:
Laboratoire d'Études Aérodynamiques, Université de Poitiers, ENSMA, CNRS, France
LAURENT DAVID
Affiliation:
Laboratoire d'Études Aérodynamiques, Université de Poitiers, ENSMA, CNRS, France
CHI YANG
Affiliation:
Department of Computational and Data Sciences, George Mason University, Fairfax, VA, USA
FRANCIS NOBLESSE*
Affiliation:
David Taylor Model Basin, NSWCCD, West Bethesda, MD, USA
*
†Email address for correspondence: [email protected]
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Abstract

Measurements of the bow waves generated by a rectangular flat plate, immersed at a draught D = 0.2 m, towed at constant speed U = 1.75 m s−1 in calm water and held at a heel angle 10° and a series of nine yaw angles α = 10°, 15°, 20°, 25°, 30°, 45°, 60°, 75° and 90° are reported. The measurements show that bow wave unsteadiness is significantly larger for the flat plate towed at yaw angles 30° ≤ α ≤ 90° than at 10° ≤ α ≤ 20°, which are associated with the unsteady and overturning bow wave regimes, respectively, separated by the boundary with g ≡ acceleration of gravity. These measurements of bow wave unsteadiness provide preliminary experimental validation of the foregoing simple theoretical relation for the boundary between the unsteady and overturning bow wave regimes for non-bulbous wedge-shaped ship bows with insignificant rake and flare. Extension of this relation to more complicated ship bows, notably bows with rake and flare, is also considered.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 620 , 10 February 2009 , pp. 167 - 175
Copyright
Copyright © Cambridge University Press 2009

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References

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