The dynamics of intrusions into a density-stratified crossflow
The dynamics of intrusions into a density-stratified crossflow
复制标题
侵入密度分层横流的动力学
DOI：
10.1063/1.4811850
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发表时间：
2013
影响因子：
4.6
通讯作者：
P. Baines
中科院分区：
文献类型：
--
作者：
P. Baines
来自分层环境（例如大气）中的稳定源（例如火山喷发）的浮力流体上升到平衡水平，并以均匀侵入形式扩散。在这里，使用半解析模型检查了在存在平均环境流量的情况下这种入侵的动力学。侵入流是无旋的，并受质量守恒和一种与侵入速度及其厚度相关的伯努利方程的控制。考虑两种类型的源——一种是来自源的初始流是径向对称的，这适用于弱侧风，另一种是单向流，这也适用于强侧风。在没有风的情况下，从径向源向外的流动在水力意义上是径向均匀的和超临界的，随着距源的距离的增加，厚度减小，速度增加。然而，在存在侧风的情况下，除非侧风非常强，否则...
Buoyant fluid from a steady source (such as a volcanic eruption) in a stratified environment (such as the atmosphere) rises to an equilibrium level where it spreads as a homogenous intrusion. Here the dynamics of such an intrusion in the presence of a mean ambient flow are examined with semi-analytical models. The intrusive flow is irrotational, and is governed by mass conservation and a form of the Bernoulli equation that relates the intrusion velocity and its thickness. Two types of source are considered—one in which the initial flow from the source is radially symmetric, which is appropriate for weak crosswinds, and another in which it is unidirectional, which also applies to strong crosswinds. In the absence of wind, the outward flow from the radial source is radially uniform and supercritical in the hydraulic sense, with decreasing thickness and increasing speed with distance from the source. In the presence of a crosswind, however, unless the crosswind is very strong a stagnation point exists on the...