MEAN-FLOW MEASUREMENTS IN THE BOUNDARY LAYER AND WAKE AND WAVE FIELD OF A SERIES 60 CB=0.6 SHIP MODEL - PART 2: SCALE EFFECTS ON NEAR-FIELD WAVE PATTERNS AND COMPARISONS WITH INVISCID THEORY

Part 2 of this two-part paper presents additional results from a towing-tank experiment conducted in order to explicate the influence of wavemaking by a surface-piercing body on its boundary-layer and wake and provide detailed documentation of the complete flow field appropriate for validating computational methods. In Part 1 (abstract no 93020378), wave profile, local and global wave-elevation, and mean-velocity and pressure field measurements for Froude numbers 0.16 and 0.316 for a 3.048 m Series 60 CB=0.6 hull form are presented and discussed to point out the essential differences between wavemaking and the boundary layer and wake. In part 2, scale effects on the near-field wave patterns are examined through wave profile and local and global wave-elevation measurements for 1.829 and 3.048 m models and Froude numbers 0.316, 0.3, and 0.25. The bow-wave amplitude and divergence angle are larger and the stern waves smaller for the smaller model. The latter scale effect is well known, but the former one is a new and unexpected result. Also, comparisons are made between the experimental results and those from a wavy inviscid-flow method, which provides an evaluation of the capabilities of the computational method. Although the computations predict the gross features of the wave system and velocity and pressure fields, they do not simulate the complex details of either the wave system of the flow field, especially close to the hull and wave centerplane.

  • Supplemental Notes:
    • J Ship Res, v 37 n 1, March 1993, p 16 [9 p, 13 ref, 11 fig]
  • Authors:
    • Longo, J
    • Stern, F
    • Toda, Y
  • Publication Date: 1993

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00705161
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM