RESISTANCE OF SUBMERGED BODIES RUNNING NEAR A FREE SURFACE

Since 1970, semi-submerged containers have been ivestigated in the Ship Research Institute. The knowledge of the hydrodynamic characteristics of a shallow-running flat submerged body has become essential for the hull form design of a large semi-submerged ship. Through the study on separation of the resistance components of three flat submerged bodies and an elliptic body of revolution, following problems are discussed. a) Unexpected large resistance of shallow-running submerged bodies (Fn greater than 0.25) results from generation of the vortices behind ship. b) The resistance due to the vortices is obtained as viscous resistance depending on Froude number because of the vortices behind submerged bodies mainly originated in the current of free waves. c) Wave making resistance of submerged bodies is seriously affected by the vortices. d) Flow symmetrization between the up and down side of the shallow-running flat submerged bodies significantly contributes to reduce the resistance.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/05148499
• Corporate Authors:

  Society of Naval Architects of Japan

  23 Shiba-kotohiracho, Minato-ku
  Tokyo 135,   Japan 
• Authors:
  • Tanaka, H
• Publication Date: 1974-12

Language

• Japanese

Media Info

• Features: References;
• Pagination: p. 1-15
• Serial:
  • Journal of the Society of Naval Architects of Japan
  • Volume: 136
  • ISSN: 0514-8499

Subject/Index Terms

• TRT Terms: Bodies of revolution; Design; Fluid resistance; Free surface; Hulls; Semisubmersibles; Submersibles; Wave resistance
• Uncontrolled Terms: Hull resistance
• Old TRIS Terms: Design process; Free surface effects
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00129333
• Record Type: Publication
• Source Agency: Society of Naval Architects of Japan
• Files: TRIS
• Created Date: Mar 10 1976 12:00AM