SUBMERGED VORTEX PAIR INFLUENCE ON AMBIENT FREE SURFACE WAVES

This paper examines how free surface gravity waves travelling over a fluid are modified by the presence of a submerged pair of vortex singularities. Greater attention has recently been focused on the problem of vortex flows near a free surface due to its possible importance in determining the influence of vortical ship wakes on radar images of the ocean surface. Although much research has concentrated on studying vortices near a still free surface, a theory for vortical influence on ambient free surface waves has not been addressed. Initial steps in uncovering the subtleties of the ambient wave modification by submerged vortices are taken utilising first order free surface boundary conditions to demonstrate the importance of the vortex-induced surface current in the interaction of vortices with ambient waves. A parametric study is then conducted showing that the relative strength of the vortices are their geometric configurations are more important in characterising the form of surface modification than the relative phase or steepness of the ambient waves. And finally, analysis of simulation data is performed indicating how a vortex pair ship wake model can contribute to the observed dark centerline wakes in radar images of ships at sea.

• Supplemental Notes:
  • Naval Hydrodynamics, 18th Symposium; 19-24 August 1990; Ann Arbor, MI, USA. Sponsored by Office of Naval Res, USA, Univ. Michigan & National Res Council, USA. Pprs. Publ by National Academy Press Washington D.C., USA. 1991, p 491 [11 p, 13 ref, 21 fig]
• Authors:
  • Fish, S
  • Kerczek, C
  • von
• Publication Date: 1991

Language

• English

Subject/Index Terms

• TRT Terms: Free surface; Gravity waves; Mathematical models; Rayleigh waves; Vortices
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00701547
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM