Dynamics and structure of planar gravity currents propagating down an inclined surface
Dynamics and structure of planar gravity currents propagating down an inclined surface
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DOI：
10.1063/1.4979063
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发表时间：
2017-03
影响因子：
4.6
通讯作者：
K. Steenhauer;T. Tokyay;G. Constantinescu
中科院分区：
文献类型：
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作者：
K. Steenhauer;T. Tokyay;G. Constantinescu
基于 3-D 大涡模拟，研究了由封闭锁中释放固定体积的较重流体并在具有水平自由表面的储层中的倾斜无滑移底面上前进而形成的平面布辛涅斯克合成重力流。包含锁流体的初始区域具有矩形形状。模拟是针对 0° 到 60° 之间的底部坡度角度 θ 进行的。倾斜底部的运行长度足够长，可以详细研究减速阶段后期（前沿速度随时间减小）的演变、锋面动力学和水流结构。结果表明，在 θ > 10° 的倾斜表面上前进的水流的特点是在头后部形成强化混合涡 (IMV)。 IMV 形成得更快，其相干性、环流和尺寸随着底部坡角的增加而单调增加。本文讨论了头部的浮力如何随不同的...
Planar, Boussinesq, compositional gravity currents formed by the release of a fixed volume of heavier fluid from a closed lock and advancing on an inclined no-slip bottom surface in a reservoir with a horizontal free surface are investigated based on 3-D large eddy simulation. The initial region containing the lock fluid has a rectangular shape. Simulations are conducted for bottom slope angles, θ, between 0° and 60°. The running length of the inclined bottom was sufficiently long to allow a detailed study of the evolution, front dynamics and structure of the current during the latter stages of the deceleration phase (front velocity reduces with time). Results show that currents advancing over inclined surfaces with θ > 10° are characterized by the formation of an intensified mixed vortex (IMV) at the back of the head. The IMV forms faster and its coherence, circulation, and size increase monotonically with increasing bottom slope angle. The paper discusses how the buoyancy in the head varies with varying...