Plane waves and structures in turbulent channel flow
Plane waves and structures in turbulent channel flow
复制标题
湍流河道流中的平面波和结构
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
L. Keefe
中科院分区：
文献类型：
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作者：
L. Sirovich;K. Ball;L. Keefe
本文用经验本征函数法（Karhunen-Loeve方法，本征正交分解）对槽道湍流流动进行了直接模拟。该分析揭示了在湍流中存在传播的平面波。传播速度由最大雷诺应力位置处的流速决定。分析进一步表明，这些波的相互作用似乎是必不可少的本地生产的湍流通过突发或席卷事件的湍流边界层，与额外的建议，快速作用的平面波作为触发器。
A direct simulation of turbulent flow in a channel is analyzed by the method of empirical eigenfunctions (Karhunen–Loeve procedure, proper orthogonal decomposition). This analysis reveals the presence of propagating plane waves in the turbulent flow. The velocity of propagation is determined by the flow velocity at the location of maximal Reynolds stress. The analysis further suggests that the interaction of these waves appears to be essential to the local production of turbulence via bursting or sweeping events in the turbulent boundary layer, with the additional suggestion that the fast acting plane waves act as triggers.