Forces on Roughened Cylinders in Harmonic Flow at High Reynolds Numbers.

Abstract

HE IN-LINE FORCES ACTING ON SAND-ROUGHENED CIRCULAR CYLINDERS IMMERSED IN AN HARMONICALLY OSCILLATING FLOW HAVE BEEN MEASURED USING A U-shaped water tunnel. The drag and the inertia coefficients have been determined through the use of a Fourier analysis. These coefficients were found to depend on the Keulegan-Carpenter number, Reynolds number, and the relative roughness. The results have shown that roughness dramatically increases the transcritical drag coefficient. It is recommended that the experiments be extended to the self-excited hydroelastic oscillations of cylinders in harmonic flows as well as to the problems related to wave slamming. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1976
Accession Number
ADA041179

Entities

People

  • Steven R. Evans

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Boundary Layer
  • Coefficients
  • Computer Programs
  • Electron Microscopes
  • Engineering
  • Engineers
  • Fluid Dynamics
  • Fluid Mechanics
  • Fourier Analysis
  • Frequency
  • Measurement
  • Mechanical Engineering
  • Reynolds Number
  • Roughness
  • Steady Flow
  • Test Facilities
  • Water Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Marine Hydrodynamics