TURBULENCE STIMULATION AND THE INITIAL BOUNDARY-LAYER DEVELOPMENT ON TWO SHIP FORMS

Inappropriate tripping devices may either not promote transition effectively or cause significant distortion of the initial boundary- layer development. By re-examining the data for reflex geosims of Lucy Ashton and a small tanker of 0.80 CB it is shown that this distortion can readily occur. To compare the boundary-layer development near the bow of a ship model under different test conditions the relative position of the virtual origin must remain constant. The concept of a virtual origin is considered using an approximate form of the momentum integral equation and it is found that locating the virtual origin is a highly ambiguous process, and therefore it becomes difficult to decide if the origin remains constant or not. To compare and extrapolate total drag results, a correction for the virtual origin position is usually applied. For two widely differing ship forms it is shown that the total skin friction coefficient is relatively insensitive to a poor estimate of the virtual origin position and an inappropriate choice of stimulator

  • Supplemental Notes:
    • J. Ship Res., 26 <1982>. p.166 <Sept.> (10 pp., 13 graphs and fig., 16 ref.)
  • Authors:
    • Smits, A J
  • Publication Date: 1982

Language

  • English

Subject/Index Terms

  • Subject Areas: Marine Transportation;

Filing Info

  • Accession Number: 00684403
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM