Unsteady fluid forces and fluidelastic vibration of a group of circular cylinders
Abstract
When a single cylinder oscillates in a quiescent fluid, its natural frequencies and model damping values are affected by the surrounding fluid; these fluid effects can generally be accounted for by fluid added mass and fluid damping forces. In a flowing fluid, added mass and fluid damping are dependent of flow velocity, and other fluid force components, fluid-stiffness force and fluid excitation force, are also important. In contrast to an isolated cylinder, the motion of a particular cylinder in a group will excite the surrounding cylinders; this type of oscillation is generally called fluidelastic vibration. Fluidelastic vibrations of multiply cylinders are attributed to fluid inertia, fluid damping, and fluid stiffness forces as well as fluid excitation forces. Once the fluid excitation forces and motion-dependent fluid forces acting on cylinders are known, coupled fluidelastic oscillations of a group of cylinders can be analyzed. The objectives of this note are to summarize the recent development of the state-of-the-art of this subject, including quiescent fluid, axial flow, crossflow, and future research needs.
- Publication:
-
Presented at the International Symposium on Gas-Liquid Two-Phase Flows in Conjunction with the Winter Annual Meeting of the ASME
- Pub Date:
- 1990
- Bibcode:
- 1990gltp.sympR..25C
- Keywords:
-
- Circular Cylinders;
- Damping;
- Fluid Flow;
- Turbulence;
- Vibration;
- Dynamic Characteristics;
- Mathematical Models;
- Reynolds Number;
- Fluid Mechanics and Heat Transfer