On the Interaction Between a Strut and the Free Surface.
Final rept. 1 Oct 72-31 Jul 75,
MICHIGAN UNIV ANN ARBOR DEPT OF NAVAL ARCHITECTURE AND MARINE ENGINEERING
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A procedure is proposed for solving problems involving the flow around surface-piercing struts. There are three steps 1 An infinite-fluid problem must be solved, in which the flow is antisymmetrical with respect to the plane of the undisturbed free surface. 2 From that solution, there is effectively a distribution of normal velocity imposed on the plane of antisymmetry the resulting wavelike disturbance can be found by a procedure which is effectively a slender-body analysis, 3 The wavelike disturbance produces a disturbance on the body strut, which must be canceled by yet another wavelike motion, which can also be found locally from a slender-body analysis. In order to justify the second and third steps, some difficulties and advantages associated with slender-ship theory are examined. It is shown how the usual axial source distribution of slender-ship theory can be modified systematically so that the slender-ship wave resistance becomes identical to the classical result of Michell for a thin ship. The slender-ship procedure has the further advantage that it is not limited to thin bodies, in particular, the body boundary condition should logically be satisfied on the exact location of the body surface, not on the centerplane. Author
- Marine Engineering
- Fluid Mechanics