Control of Oscillatory Forces on a Circular Cylinder by Rotation

Abstract

The temporal development of forces acting on a rotating cylinder is investigated numerically in response to a variety of time-dependent rotation rates. Solutions are presented for several types of rotation that illustrate significant effects of the rotation rate on lift, drag and lift to drag coefficients. Of special interest is the formulation of an optimal control problem for the case of constant speed of rotation. We find an optimal rotation rate that achieves the maximum value of time-averaged lift/drag ratio.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1991
Accession Number
ADA240880

Entities

People

  • Yuh-roung Ou

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Boundary Layer
  • Coefficients
  • Computational Fluid Dynamics
  • Computers
  • Differential Equations
  • Engineering
  • Equations
  • Flow Fields
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Hypervelocity Flow
  • Mechanical Properties
  • Resonant Frequency
  • Unsteady Flow
  • Viscous Flow

Readers

  • Aerodynamics/Aeronautics.
  • Calculus or Mathematical Analysis
  • Fluid Mechanics and Fluid Dynamics.