Abstract
The mathematical model for fluid damping controlled instability of tubes in crossflow presented in this paper is based on unsteady flow theory. Motion-dependent fluid forces are measured in a water channel. From the measured fluid forces, fluid stiffness and fluid damping coefficients are calculated as a function of reduced flow velocity, oscillation amplitude, and Reynolds number. Once these coefficients are known, the mathematical model can be applied to predict structural instability due to fluid damping. The cases considered are a single tube, twin tubes, tube row, triangular array, and square arrays. The results show instability regions that are based on the fluid damping coefficients and provide answers to a series of questions on fluidelastic instability of tube arrays in crossflow.
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