Viscous flow around a rotationally oscillating circular cylinder
Abstract
Aerodynamic characteristics of a circular cylinder either stationary or rotationally oscillating around its axis in uniform viscous flow were analyzed by numerical calculation and by experiment. The method and results of numerical solution of the Navier-Stokes equations by the finite difference analog are presented; measurements for the lift and the drag forces acting on the cylinder made by towing test models in still fluid in a range of Reynolds number, Re=40 to 6100 are included. Good agreement was obtained between the calculated results and the experimental ones at Reynolds numbers Re=40 and 80, concerning the steady and unsteady aerodynamic parameters and the phenomenon of the so-called synchronization. It becomes clear from numerical calculation that there may be a close relationship between the time-variation of the flow pattern and that of the lift force on an oscillating cylinder. The influence of Reynolds number on the aerodynamic parameters and the phenomenon of synchronization were examined.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- September 1975
- Bibcode:
- 1975STIN...7614408O
- Keywords:
-
- Circular Cylinders;
- Oscillating Cylinders;
- Viscous Flow;
- Aerodynamic Characteristics;
- Finite Difference Theory;
- Navier-Stokes Equation;
- Numerical Analysis;
- Unsteady Aerodynamics;
- Fluid Mechanics and Heat Transfer