THE PHYSICS OF WALL TURBULENCE
THE PHYSICS OF WALL TURBULENCE
复制标题
壁湍流的物理学
DOI：
10.1016/s0378-4371(98)00507-x
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发表时间：
1999
影响因子：
3.3
通讯作者：
J. Jiménez
中科院分区：
文献类型：
--
作者：
J. Jiménez
本文简要地回顾了有壁湍流的特性，重点是那些保持开放的领域，以及那些与一般湍流问题不同的领域。有人认为，近壁区是合理的理解，至少光滑的墙壁，但它与外部流的相互作用没有，包括在大雷诺数的渐近行为的问题。对数区域的相似性属性的解决，鉴于最近的争议，其有效性。通过对涨落强度实验数据的分析，得出结论：对数律的经典匹配论证可能是正确的。最后，壁流被确定为座位的第二，空间，能量级联，不同于经典的Kolmogorov之一。据推测，边界层的大规模的不稳定性可能反映了这种叶栅的模式形成的不稳定性，可能与某些异常观察到的边界层粗糙的墙壁。
The behaviour of wall-bounded turbulent flows is briefly reviewed, with emphasis on areas which remain open and which are distinct from the problem of turbulence in general. It is argued that the near-wall region is reasonably well understood, at least for smooth walls, but that its interactions with the outer flow are not, including the question of its asymptotic behaviour at large Reynolds numbers. The similarity properties of the logarithmic region are addressed next, in view of the recent controversy about its validity. It is concluded, from an analysis of experimental data for the fluctuation intensities, that the classical matching argument for the logarithmic law is probably correct. Finally, wall flows are identified as the seat of a second, spatial, energy cascade, different from the classical Kolmogorov one. It is conjectured that the large-scale intermittency of boundary layers might reflect a pattern-forming instability of this cascade, possibly related to certain anomalies observed in boundary layers over rough walls.