Local intermodal energy transfer of the secondary instability in a plane channel
Local intermodal energy transfer of the secondary instability in a plane channel
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平面通道中二次不稳定性的局部多式联运能量传递
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
H. Reed
中科院分区：
文献类型：
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作者：
B. Singer;J. Ferziger;P. Spalart;H. Reed
发展了一种分析波矢三元组之间局部能量传递速率的数学方法，并将其应用于具有各种初始条件的波浪的直接数值模拟所产生的数据。从基本的二维波和随机噪声开始模拟，产生的结构与从三维中心模式演变而来的结构非常相似。在这种情况下确定的局部传输率有助于解释在风洞实验中观察到的初级二维波动的最终变形。在初始流场中加入弱的流向涡会导致大量的能量在模拟早期被转移到K型模式。波的后期发展(因此能量转移率)类似于前一种情况。
A mathematical technique for analyzing local energy-transfer rates among wave-vector triads is developed and applied to the data generated by direct numerical simulations of waves with various types of initial conditions. Starting the simulation with a primary two-dimensional wave and random noise produced structures very similar to those which evolved from three-dimensional center modes. The local transfer rates determined in this case help to explain the eventual deformation of the primary two-dimensional wave which was observed in wind-tunnel experiments. Including weak streamwise vortices in the initial flow field results in large amounts of energy being transferred to the K-type modes early in the simulation. The later development of the waves (and hence the energy-transfer rates) is similar to the previous case.