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THE FREE-SURFACE BOW DRAG OF A TWO-DIMENSIONAL BLUNT BODY.

Gédéon Dagan, Marshall P. Tulin

Abstract

Abstract : The breaking wave in front of blunt bow displacement ships causes most of the wave resistance of such ships. A theoretical analysis of the two-dimensional gravity free-surface flow past a blunt body of semi-infinite length, representing a first approximation of the breaking wave, is presented. The jet model was selected for the representation of the bow momentum loss. The equation of flow are solved by a high draft Froude number expansion. The velocity distribution, the jet thickness and the associated drag are computed by the aid of inner and outer expansions. The results are compared with Baba's (1969) towing-tank tests. (Author)

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Key concepts: Froude number, Drag, Mechanics, Free surface, Physics, Wave drag, Jet (fluid), Parasitic drag