Accession Number : AD0712529

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

Descriptive Note : Technical rept.,

Corporate Author : HYDRONAUTICS INC LAUREL MD

Personal Author(s) : Dagan,G. ; Tulin,M. P.

Report Date : AUG 1970

Pagination or Media Count : 43

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)

Descriptors :   (*SHIP HULLS, *DRAG), BLUNT BODIES, HYDRODYNAMICS, TWO DIMENSIONAL FLOW, OCEAN WAVES, MOMENTUM, SURFACE PROPERTIES, VELOCITY

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE