EFFECTS OF WAVES ON THE BOUNDARY OF A SURFACE-PIERCING FLAT PLATE: EXPERIMENT AND THEORY

Results are presented from a towing-tank experiment conducted to document the effects of waves on the boundary layer of a surface- piercing body. A unique, simple model geometry is utilized that makes it possible to identify and isolate the most important features of the wave-induced effects. Measurements were made of wave profiles as well as detailed boundary-layer velocity profiles for three wave-steepness conditions: zero, medium, and large. The effects of the waves for both the medium- and large-steepness conditions are shown to be significant. In particular, the variations of the external-flow piezometric-pressure gradients cause acceleration and deceleration phases of the streamwise velocity component and alternating direction of the crossflow, which result in large oscillations of the displacement thickness and wall-shear stress as compared to the zero-steepness condition. The magnitude of these trends increases with increasing wave steepness. Wave-induced separation, which is present under certain conditions in the experiments, and other relevant phenomena are discussed. The measurements are compared and close agreement is demonstrated with results from first-order boundary-layer calculations with a symmetry-condition approximation for the free-surface boundary conditions.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00224502
• Supplemental Notes:
  • Journal article
• Authors:
  • Stern, F
  • Hwang, W S
  • Jaw, S Y
• Publication Date: 1989-3

Media Info

• Features: References;
• Pagination: 18 p.
• Serial:
  • Journal of Ship Research
  • Volume: 33
  • Issue Number: No.1
  • Publisher: Society of Naval Architects and Marine Engineers
  • ISSN: 0022-4502
  • EISSN: 1542-0604
  • Serial URL: https://onepetro.org/jsr

Subject/Index Terms

• TRT Terms: Boundary layer; Structural plates; Water waves
• Uncontrolled Terms: Model tests
• Old TRIS Terms: Flat plates; Surface piercing
• Subject Areas: Hydraulics and Hydrology; Marine Transportation;

Filing Info

• Accession Number: 00657178
• Record Type: Publication
• Source Agency: Maritime Technical Information Facility
• Files: TRIS
• Created Date: Jul 21 1994 12:00AM