Gravity Currents in Confined Channels with Environmental Shear
Gravity Currents in Confined Channels with Environmental Shear
复制标题
具有环境剪切作用的受限通道中的重力流
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
R. Rotunno
中科院分区：
文献类型：
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作者：
G. Bryan;R. Rotunno
AbstractThis study examines properties of gravity currents in confined channels with sheared environmental flow. Under the assumptions of steady and inviscid flow, two-dimensional analytic solutions are obtained for a wide range of shear values. The slope of a gravity current interface just above the surface increases as environmental shear α increases, which is consistent with previous studies, although here it is shown that the interface slope can exceed 80° for nondimensional shear α > 2. Then the inviscid-flow analytic solutions are compared with two- and three-dimensional numerical model simulations, which are turbulent and thus have dissipation. The simulated current depths are systematically lower, compared to a previous study, apparently because of different numerical techniques in this study that allow for a faster transition to turbulence along the gravity current interface. Furthermore, simulated gravity current depths are 10%–40% lower than the inviscid analytic values. To explain the model-pr...
