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首页> 外文期刊>Applied Mathematical Modelling >One-way and two-way couplings of CFD and structural models and application to the wake-body interaction
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One-way and two-way couplings of CFD and structural models and application to the wake-body interaction

机译：CFD与结构模型的单向和双向耦合及其在尾流相互作用中的应用

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The current study focuses on the wake-body interaction of a circular cylinder, whose transverse free vibration is modeled by a mass-spring-damper system coupled to a computational fluid dynamics (CFD) model for the flow and wake. We first simulate the free vibration of the elastically-mounted cylinder and the wake, and analyze the transverse load it exerts on the cylinder and its phase with the vibration. We vary the damping by three orders of magnitude and examine the difference in the wake-body interaction for slightly-damped and highly-damped systems. We then use the spectral properties of the free vibration and use them to construct two different types of forced vibrations: one consists only of the fundamental component of the free vibration, and the other accounts for all spectral properties of it. We compare the wake load for each type to that corresponding to the free vibration. The forced vibrations correspond to a one-way coupling and the information is communicated from the CFD model to the structural model, whereas the free vibration corresponds to a two-way coupling of the models. By comparing the spectral properties of the wake load, including the phase relation of its components with the vibration, which we obtained for the free vibration and for the equivalent forced vibration, we identify the effects of the wake feedback. The findings show that a forced vibration does not reproduce exactly the wake load at small and intermediate levels of structural damping. As the damping increases, the vibration changes from being in-phase with the wake load to being 90° out-of-phase with it, corresponding to two different wake states, and the forced vibration gives wake load that is very close to the one occurring in the case of full wake-body interaction.
机译：当前的研究集中在圆柱体的尾流相互作用上，该圆柱体的横向自由振动通过质量弹簧-阻尼器系统进行建模，该系统与流动和尾流的计算流体力学（CFD）模型耦合。我们首先模拟弹性安装的圆柱体和尾流的自由振动，并分析其施加在圆柱体上的横向载荷及其与振动的相位。我们将阻尼变化了三个数量级，并研究了轻微阻尼和高度阻尼系统的尾流相互作用。然后，我们使用自由振动的频谱特性，并使用它们来构造两种不同类型的强制振动：一种仅由自由振动的基本组成，而另一种则说明了自由振动的所有频谱特性。我们将每种类型的尾流载荷与对应于自由振动的载荷进行比较。强迫振动对应于单向耦合，并且信息从CFD模型传递到结构模型，而自由振动对应于模型的双向耦合。通过比较唤醒负载的频谱特性（包括其分量与振动的相位关系）（我们针对自由振动和等效强制振动获得的频谱特性），可以确定唤醒反馈的影响。研究结果表明，在结构阻尼的中小级别上，强制振动不能准确地再现尾流载荷。随着阻尼的增加，振动从与尾流同相变为与它异相90°，对应于两种不同的尾流状态，而强制振动使尾流载荷非常接近一个尾流状态。发生在完全的尾流与人体相互作用的情况下

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