OSCILLATING VISCOUS FLOW OVER AN INCLINED ELLIPTIC CYLINDER

The problem of oscillating viscous flow over a stationary cylinder of elliptic cross-section is investigated. The free stream direction is horizontal and is always normal to the cylinder axis and oscillations are only allowed in the magnitude of the stream velocity. The flow is incompressible and two-dimensional and the free stream oscillations are harmonic. The elliptic cylinder considered has a major-minor axis ratio of 0.6 and is inclined to the free stream direction at angles of incidence of either 30 or 60o. The investigation is based on the solution of the time-dependent Navier-Stokes equations together with the mass conservation equation. The parameters involved are the cylinder axis ratio, angle of incidence, Reynolds number, and Strouhal number. The Reynolds number ranges between 102 and 103 and the Strouhal number ranges between pi/4 and pi/2. The time variation of the flow field is presented in the form of streamline patterns as well as surface vorticity distribution. The surface pressure distribution and the time variation of the in-line and transverse force coefficients are also presented and compared with an inviscid flow solution for the same problem. The comparison between viscous and inviscid flow results shows a better agreement for higher values of Reynolds and Strouhal numbers.

• Supplemental Notes:
  • Ocean Engng, v 21 n 4, May 1994, p 401 [26 p, 20 ref, 11 fig]
• Authors:
  • Badr, H M
• Publication Date: 1994

Language

• English

Subject/Index Terms

• TRT Terms: Cylindrical bodies; Force; Viscous flow; Waves
• Old TRIS Terms: Oscillating flow; Wave forces on structures
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00716146
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Feb 28 1996 12:00AM