ON THE INTERACTION BETWEEN A STRUT AND THE FREE SURFACE

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)

  • Corporate Authors:

    University of Michigan, Ann Arbor

    Department of Naval Architects and Marine Engineers
    Ann Arbor, MI  United States  48109
  • Authors:
    • Ogilvie, T F
  • Publication Date: 1975-8

Media Info

  • Pagination: 34 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00136295
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: No. 175 Final Rpt.
  • Contract Numbers: N00014-67-A0181-0053
  • Files: TRIS
  • Created Date: Jul 13 1976 12:00AM