Instability and Control of Massively Separated Flows - Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013
Instability and Control of Massively Separated Flows - Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013
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大规模离散流的不稳定与控制 - 2013 年 9 月 4-6 日在意大利普拉托举行的大规模离散流不稳定与控制国际会议论文集
DOI：
10.1007/978-3-319-06260-0_21
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Rigas G
中科院分区：
文献类型：
--
作者：
Rigas G
本文研究了轴对称海崖体湍流尾迹中的相干结构。从流体动力稳定性的概念是用来推导低维数学模型的基础上弱非线性分析的控制Navier-Stokes方程描述的相干结构在近尾流的时间振幅演化。通过轴对称脉冲喷吹的实验验证了模型的正确性。模型预测和实验之间获得了很好的定量一致性，第一次表明，Landau型模型能够描述三维湍流尾流的动态行为。
The coherent structures observed in the turbulent wake of axisymmetric bluff bodies are investigated. Concepts from hydrodynamic stability are used to derive low-dimensional mathematical models based on a weakly nonlinear analysis of the governing Navier-Stokes equations that describe the temporal amplitude evolution of the coherent structures in the near wake. Forced experiments applying axisymmetric pulsed-jet blowing on the base of the body are performed to validate the models. Very good quantitative agreement between model predictions and experiments is obtained, showing for the first time that Landau-type models are capable of describing the dynamic behavior of a three-dimensional turbulent wake.