升沉振荡中矩形圆柱气动弹性失稳的数值研究

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI:10.1115/imece1997-0061

T. Tamura, Y. Itoh

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引用次数: 0

摘要

本文采用直接有限差分法，在不引入湍流模型的情况下，对强制振荡和自由振荡矩形圆柱的三维非定常流场进行了数值模拟。讨论了该方法预测非定常气动力和各种动力特性响应的准确性。首先通过与实验的比较，研究了D/B = 2条件下矩形圆柱受迫振荡时的气动力。此外，为了了解在均匀流动中以起伏模式弹性安装的矩形圆柱体的不稳定振荡的基本行为，分别研究了各种动态参数(如质量比、阻尼比或斯克鲁顿数)对气动弹性不稳定性的影响。

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Numerical Study on Aeroelastic Instability of a Rectangular Cylinder in Heaving Oscillations

The unsteady three-dimensional flows around a forced-oscillating or freely oscillating rectangular cylinder are numerically simulated by means of the direct finite difference method without any turbulence model. We discuss the accuracy of the present method for prediction of unsteady aerodynamic forces and responses to various dynamic properties. First we examine the aerodynamic forces in case of forced oscillation with D/B = 2 of a rectangular cylinder through the comparison with experiments. Also, in order to understand fundamental behaviors of unstable oscillations of a rectangular cylinder, which is elastically mounted in heaving mode in uniform flow, the effect of various dynamic parameters such as mass ratio, damping ratio or the Scruton number, on aeroelastic instabilities is individually investigated.

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4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I

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