Wave-Interference Effects on Far-Field Ship Waves in the Presence of a Shear Current

Wave-interference effects, in the presence of a shear current of uniform vorticity, are analyzed for the first time. An interesting similarity is found between the analysis of wave interferences when a linear shear current is present and that in finite depth water. In particular, wave-interference regimes exist in both analyses. The consideration of wave interferences in the presence of a shear current, for a 2-point wavemaker model of monohull ships, is shown to have interesting and nontrivial effects on ship waves, as also found in the analysis of wave interferences in finite water depth. The effect of shear on the far-field waves created by a 2-point wavemaker model of a monohull ship greatly depends on the shear Froude number , where V is the speed of the ship, S is the uniform vorticity of the shear, and g is the gravitational acceleration, as well as the angle between the shear current and the direction of motion of the ship. The Kelvin shear Froude numbers for which the ray angles of the highest waves are equal to the Kelvin angles are determined. The ray angles of the highest waves are considerably smaller than the Kelvin angles for . The presence of a shear current has significant effects on the wave interferences for the Froude number (where L is the ship length). Conclusions drawn from the geometrical analysis in specific cases are confirmed by ship wakes obtained from the superposition of waves generated by the ship bow and stern modeled as a 2-point wavemaker.

• Record URL:
  https://doi.org/10.5957/JOSR.170017
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00224502
• Supplemental Notes:
  • Abstract used with permission from the Society of Naval Architects and Marine Engineers (SNAME)
• Authors:
  • Li, Yan
• Publication Date: 2018-3

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 37-47
• Serial:
  • Journal of Ship Research
  • Volume: 62
  • Issue Number: 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: Far field; Ocean currents; Ships; Water waves
• Uncontrolled Terms: Wave interference
• Subject Areas: Hydraulics and Hydrology; Marine Transportation;

Filing Info

• Accession Number: 01667805
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 30 2018 5:21PM