Development of a point plume in the presence of background rotation
Development of a point plume in the presence of background rotation
复制标题
在背景旋转的情况下形成点羽流
DOI：
10.1063/1.869754
复制
发表时间：
1998
影响因子：
4.6
通讯作者：
B. A. Ayotte
中科院分区：
文献类型：
--
作者：
H. J. S. Fernando;R.;B. A. Ayotte
本文描述了一个实验室研究的点湍流羽流的演变放置在一个均匀的流体层的自由表面存在的背景旋转。结果表明，羽流最初的演变，如果没有旋转。然而，在羽流下降一个垂直距离hc 1 <$3.3（B/Ω3）1/4，归一化时间Ω tc 1 <$2.4之后，旋转效应变得重要，由此羽流的垂直下降速率减小，同时保持大致相同的横向增长速率。这里Ω是背景旋转速率，B是羽流的比浮力通量。当最大羽流宽度bc = 1.4（B/Ω3）1/4时，旋转效应抑制了羽流的横向生长。此后，垂直下降继续和羽演变成一个圆柱形，同时发展气旋环流和周围，除了附近的羽锋。当到达底部表面后，旅行的流体深度H后，羽流偏转，传播水平…
This paper describes a laboratory study on the evolution of a point turbulent plume placed at the free surface of a homogeneous fluid layer in the presence of background rotation. It is shown that the plume initially evolves as if there is no rotation. However, the rotational effects become important after the plume descends a vertical distance hc1≈3.3(B/Ω3)1/4 for a normalized time Ωtc1≈2.4, whence the vertical descent rate of the plume is reduced while maintaining approximately the same lateral growth rate. Here Ω is the rate of background rotation and B is the specific buoyancy flux of the plume. The rotational effects inhibit the lateral growth of the plume at a time Ωtc2≈5.5, when the maximum plume width is bc≈1.4(B/Ω3)1/4. Thereafter, the vertical descent continues and the plume evolves into a cylindrical shape while developing a cyclonic circulation in and around it, except near the plume front. Upon reaching the bottom surface after traveling a fluid depth of H, the plume deflects, propagates hori...