Stability of Laminar Flow at Seabed
Stability of Laminar Flow at Seabed
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海底层流稳定性
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
J. Sleath
中科院分区：
文献类型：
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作者：
J. Sleath
对二维粗糙床层上方层流边界层中水波产生的流动进行了分析研究。在低雷诺数下，流体在封闭的循环单元中漂移，而不分散。在高雷诺数下，大尺度粗糙度会形成涡流，并且在小尺度粗糙度的每个半波周期的某个点会产生突然的流体喷射。在这两种情况下，床附近都会发生剧烈混合。这种混合与该领域其他作者描述的湍流之间的相似性表明，这项研究的结果可以应用于振荡边界层的过渡问题。 LI 和 Manohar 的测量结果被重新检验并提出了新的曲线。其他作者的结果与新曲线相当一致。对染料舌的形成提供了解释。
The flow produced by water waves in the laminar boundary layer above a two-dimensional rough bed is studied analytically. At low Reynolds numbers the fluid drifts in closed recirculating cells, without dispersion. At high Reynolds numbers, vortex formation occurs for large-scale roughness and sudden jets of fluid are produced at a certain point in each half wave cycle with small-scale roughness. In both cases there is vigorous mixing close to the bed. The similarity between this mixing and that described by other authors in this field as turbulence suggests that the results of this study may be applied to the problem of transition in oscillatory boundary layers. The measurements made by LI and Manohar are reexamined and new curves proposed. The results of other authors are found to be in reasonable agreement with the new curves. An explanation is provided for the formation of tongues of dye.