Hybrid Analysis Method Using CFD And
Analytical Solutions On Fluid Elastic Vibration Of
Circular Cylinder Arrays
Author(s)
K. Fujita & T. Wakita
Abstract
In this paper, the hybrid method using the computational fluid dynamics (CFD) and
the analytical solution on the fluid elastic vibration of circular cylinder arrays is
proposed. The fluid forces acting on cylinder arrays are calculated as the influence
coefficients which are obtained by the sinusoidal excitation on a cylinder in a
small-scale of cylinder arrays subjected to a cross flow in the CFD simulation.
Applying these fluid forces to a large-scale of cylinder arrays, the entire equations
of motion can be derived for stability analysis. Comparing the direct simulation
analysis based on CFD, the proposed hybrid method is found to be useful for
evaluating the critical velocity of the fluid elastic vibration with less computational
time. In addition, the present method is also very convenient for grasping the
physical meaning on the fluid elastic vibration behavior, such as evaluating which
vibration mode becomes unstable fastest among a group of complex eigenvalues
generated by the coupled vibration among many circular cylinders in a fluid.
Keywords: fluid elastic vibration, circular cylinder arrays, cross flow induced
vibration, CFD simulation, stability analysis.
1 Introduction
Many studies have been already performed on the mechanism of the fluid
elastic vibration of circular cylinder arrays occurred in heat exchangers and
stream generators, experimentally and analytically. Conners, Hartlen, Gorman,
Zdravkovich, S. S. Chen and Ishigai et al. can be listed up first as the contributors
Keywords
fluid elastic vibration, circular cylinder arrays, cross flow induced
vibration, CFD simulation, stability analysis.
Related Book
Other papers in this volume
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