UNSTEADY FLOW AROUND A SLENDER FISH-LIKE BODY

The paper attempts to extend some recent theoretical calculations on the unsteady flow generated by body movements of a slender 'flat' fish by further including the effect of finite body thickness in the consideration for various configurations of side and caudal fins as major appendages. Based on the slender-body approximation, the cross-flow is determined for different longitudinal body sections which are characterized by a variety of cross-sectional shapes and flow conditions (such as having smooth or fin-edged body contours, with or without vortex sheets alongside the body section). The effect of body thickness is found to arise primarily from its interaction with the vortex sheet already existing in the cross-flow. New results for the transverse hydrodynamic force acting on the body are obtained, and their physical significances are discussed. (Author)

• Supplemental Notes:
  • Sponsored in part by Grant NSF-GK-10846. Prepared in cooperation with California Institute of Technology, Pasadena, Grant NSF-GK-10216. Also available in Proceedings of the International Symposium on Directional Stability and Control of Bodies Moving in Water, pp33-42, Paper 7.
• Corporate Authors:

  Massachusetts Institute of Technology

  Department of Ocean Engineering, 77 Massachusetts Avenue
  Cambridge, MA  United States  02139
• Authors:
  • Wu, TYT
  • Newman, J N
• Publication Date: 1972-2-10

Media Info

• Pagination: 11 p.

Subject/Index Terms

• TRT Terms: Flow fields; Hydrodynamics; Thinness
• Old TRIS Terms: Hydrodynamic configurations; Slender bodies
• Subject Areas: Design; Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00034713
• Record Type: Publication
• Source Agency: National Technical Information Service
• Contract Numbers: N00014-67-A-00940012, N00014-67-A-02040023
• Files: TRIS
• Created Date: Sep 29 1972 12:00AM