Numerical and experimental study of dynamics of two-dimensional body
Abstract
Autorotation of a two-dimensional elliptic cylinder around its spanwise axis fixed perpendicularly to a uniform flow was numerically simulated by means of a discrete vortex-blob method. The results were compared with those of the experiments by a wind tunnel and a water channel, which were carried out in both the autorotating state and the forced rotating state with constant angular velocities driven by a stepping motor. The behavior and the interaction of the vortices shed behind the rotating elliptic cylinder were studied, making use of visualization of the numerical simulation results. Moreover, animation of the displayed image was made to illustrate the vortex interaction processes. Based on the moment of inertia and the thickness ratio of the cylinder, the starting condition of the autorotation was determined based on the mechanism of the autorotation. The driving force is produced by eliminating the vortex created behind the retreating edge. By means of graphic simulation utilizing a color coded vorticity display and animation, processes of the merging, rearrangement, interaction and splitting of the vortices in the wake of the rotating wing were visualized making these processes clearly understandable.
- Publication:
-
Unknown
- Pub Date:
- March 1986
- Bibcode:
- 1986nesd.rept.....I
- Keywords:
-
- Autorotation;
- Elliptical Cylinders;
- Experiment Design;
- Fluid Dynamics;
- Mathematical Models;
- Two Dimensional Bodies;
- Uniform Flow;
- Animation;
- Computer Graphics;
- Computerized Simulation;
- Imagery;
- Motion;
- Vortices;
- Wind Tunnel Tests;
- Physics (General)