In-Line and Transverse Forces on Smooth and Rough Cylinders in Oscillatory Flow at High Reynolds Numbers.

Abstract

This report presents the results of an extensive experimental investigation of the in line and transverse forces acting on smooth, sand roughened, and marine roughened circular cylinders (k/D = 1/50) of identical length to diameter ratio (L/D = 2) placed in a sinusoidally oscillating flow. The drag, inertia, and the maximum force coefficients have been determined through the use of the Fourier analysis. The transverse force (lift) has been analysed in terms of its root mean square value. In addition, the amplitude of the first ten harmonics have been determined. The results are presented in both graphical and tabulated form in terms of the Reynolds number, Keulegan Carpenter number, relative roughness and the frequency parameter beta (= Re/K). Keywords: Oscillating flow; Unsteady flow; Wave forces; Drag and inertia; and Time dependent flow.

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Document Details

Document Type
Technical Report
Publication Date
Jul 04, 1986
Accession Number
ADA169562

Entities

People

  • Turgut Sarpkaya

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics
  • C4I

DTIC Thesaurus Topics

  • Acquisition
  • Boundary Layer
  • Civil Engineering
  • Engineering
  • Fluid Flow
  • Fourier Analysis
  • Hydrodynamics
  • Measurement
  • Oscillation
  • Physics Laboratories
  • Production
  • Test Facilities
  • Tunnels
  • Two Dimensional
  • Unsteady Flow
  • Valves
  • Water Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Marine Hydrodynamics