Analysis of lock-exchange gravity currents over smooth and rough beds
نویسندگان
چکیده
منابع مشابه
Double-diffusive lock-exchange gravity currents
The dynamics of double-diffusive gravity currents exhibiting the fingering instability were examined using 2D and 3D simulations of a lock exchange initial configuration. It was found that although the spreading of the currents was governed by a balance of buoyancy and turbulent drag forces, currents with more intense fingering spread faster than those with less intense or no fingering. This wa...
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Dense oceanic overflows mix with surrounding waters along the descent down the continental slope. The existing parameterizations for entrainment in dense currents account primarily for the shear-induced entrainment at the interface between the dense flow and the ambient fluid. However, the turbulence generated by roughness elements at the bottom boundary, which produces an enhanced drag, can be...
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This paper examines the motion of a dense fluid that develops as an inertial gravity current of decreasing mass above a horizontal porous bed, while flow described by Darcy’s law occurs in the bed. Measurements of the mass and the front position of the current in a set of laboratory experiments performed by changing different parameters are presented. The results are explained by means of a glo...
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This dissertation focuses on the analysis of lock-exchange gravity-driven flows at high Grashof numbers using highly resolved numerical simulations and Large Eddy Simulation (LES) techniques. The present method uses a non-dissipative Navier-Stokes solver in which the sub-grid scale (SGS) viscosity and diffusivity are calculated dynamically. The use of LES allowed the study of these gravity curr...
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ژورنال
عنوان ژورنال: Journal of Hydraulic Research
سال: 2013
ISSN: 0022-1686,1814-2079
DOI: 10.1080/00221686.2013.798363