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CALCULATION OF TRANSOM STERN FLOWS

This paper presents a method of calculating the slow near a transom stern ship moving forward at a moderate to high steady speed into otherwise undisturbed water. The speed is assumed to be sufficient to guarantee smooth flow separation at the stern and a dry transom. In addition, conditions necessary to justify the assumption of potential flow are assumed. Modified free-stream linearization is used to obtain a Neumann-Kelvin boundary value problem in which the usual linearization about the mean free-surface level is replaced in the area behind the transom stern by linearization about a surface originating at the hull-transom intersection. A rankine singularity integral equation is presented for obtaining the solution of the resulting mathematical boundary-value problem. The integral equation involves line integrals around the hull and has been designed so that it greatly reduces the requirements of using forward finite differences to enforce the radiation boundary condition. The approach permits the presence of free-surface dipoles and provides a mechanism for carrying lift downstream from a transom stern in accordance with the work of various researchers who, in recent years, had suggested that lift effects are an important component of wave resistance under certain conditions. Computation results are presented for two transom-stern ships.

  • Supplemental Notes:
    • 6th Intl Conf on Numerical Ship Hydrodynamics; 2-5 Aug 1993; Iowa, USA. Sponsored by US National Research Council et al. Procs. Publ by National Academy Press, USA, 1994. Session 2, p 79 [14 p, 14 ref, 22 fig]
  • Authors:
    • Telste, J G
    • Reed, A M
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00709110
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM