Large Eddy Simulation of Separated Flow over a Two-dimensional Hump with and without Control by Means of a Synthetic Slot-jet

Large Eddy Simulation of Separated Flow over a Two-dimensional Hump with and without Control by Means of a Synthetic Slot-jet
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二维驼峰上分离流的大涡模拟,有或无合成狭缝射流控制

DOI:
10.1007/s10494-009-9218-y
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发表时间:
2009
期刊:
Flow, Turbulence and Combustion
影响因子:
--
通讯作者:
Avdis A
Avdis A
中科院分区:
--
文献类型:
--
作者:
Avdis A

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报告并讨论了从管道中的二维驼峰分离的两个流动的大涡模拟。这些流量的不同之处在于是否存在以正弦方式注入的合成狭缝射流,即以零净质量流量、靠近分离位置并旨在减少(“控制”)分离区域的范围。报告的结果包括瞬时可视化、预乘光谱、壁压分布、流函数场以及速度和二阶矩的分布。对于这两种流动,模拟和实验结果之间的一致性通常很好,特别是在合成射流的整体控制有效性方面,尽管使用了桥接粘性底层的近似壁处理。利用速度场的本征正交分解来研究结构特征,这表明基流中最具能量的模态代表了分离区域中的大型流向涡,而在受控流中,大多数能量主导模态与大型展向涡有关。
Large Eddy Simulations for two flows separating from a two-dimensional hump in a duct are reported and discussed. The flows differ through the presence or absence of a synthetic slot-jet injected in a sinusoidal manner, i.e. at zero net mass-flow rate, close to the location of separation and intended to reduce (“control”) the extent of the separated region. Results reported include instantaneous visualisations, pre-multiplied spectra, wall-pressure distributions, streamfunction fields and profiles of velocity and second moments. For both flows, agreement between the simulations and the experimental results is generally good, especially in respect of the overall control effectiveness of the synthetic jet, despite the use of an approximate wall treatment bridging the viscous sublayer. Proper Orthogonal Decomposition of the velocity field is used to study structural features, and this shows that the most energetic mode in the base flow is representative of large streamwise vortices in the separated region, while in the controlled flow, most of the energetically dominant modes are associated with large spanwise vortices.
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