ON THE VISCOUS FLOW PAST BLUNT BODIES

Imai suggested a new method to estimate the pressure drag coefficients of bluff bodies at high Reynolds numbers. He supposed that the flow at high Reynolds numbers might be obtained by solving a modified Navier-Stokes equation at low Reynolds numbers which was determined by the assumption of the eddy viscosity in the wake region. In this paper authors discuss the details of the two-dimensional viscous fluid flows past blunt bodies of arbitrary shape at low Reynolds number (R=40) by solving numerically Navier- Stokes equations, and investigate the validity of Imai's hypothesis. The results obtained are that Imai's idea concerning the flow pattern can be acceptable, and that the pressure drag coefficients of bluff bodies at low Reynolds numbers agree approximately with those in the high but subcritical Reynolds number range; but that Imai's idea gives invalid information as to the pressure distribution along the body surface at high or supercritical Reynolds numbers.

• Corporate Authors:

  Society of Naval Architects of Japan

  23 Shiba-kotohiracho, Minato-ku
  Tokyo 135,   Japan 
• Authors:
  • Himeno, Y
  • TAKAGI, M
• Publication Date: 1972

Media Info

• Pagination: p. 1-20
• Serial:
  • Selected Papers, J of Soc of Naval Arch of Japan
  • Volume: 9
  • Publisher: Society of Naval Architects of Japan

Subject/Index Terms

• TRT Terms: Bluff bodies; Boundary layer; Reynolds number; Viscous flow; Wakes
• Old TRIS Terms: Boundary layer theory; Wake analysis
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00035117
• Record Type: Publication
• Source Agency: Society of Naval Architects of Japan
• Files: TRIS
• Created Date: Oct 27 1972 12:00AM