The temporal development of the surface signatures (scars and striations) resulting from the interaction of an ascending inclined vortex pair with the free surface has been investigated. The vortices were generated by towing horizontally various lifting surfaces (delta wings and rectangular foils of different shape and aspect ratio) well below the free surface at prescribed speeds, depths, and negative angles of attack. The evolution of each type of surface signature has been expressed in terms of the depth of generation, mutual induction velocity, and the initial spacing of the vortex pair. It has been shown that V-shaped surface signatures of finite length are created and driven by trailing vortices migrating from depths less than about five initial vortex separation distances. Vortices generated at larger depths gave rise to more complex surface signatures due to the onset of sinusoidal instability, vortex linking, and/or vortex breakdown. The apparent circulation of the vortices, based on the measured characteristics of the scar tracks, was found to be a universal function of a normalized time, measured relative to the inception of the striations.

  • Supplemental Notes:
    • Conference paper
  • Authors:
    • Sarpkaya, T
  • Conference:
  • Publication Date: 0

Media Info

  • Features: References;
  • Pagination: 13p., incl. discuss.

Subject/Index Terms

Filing Info

  • Accession Number: 00657858
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM