Gravity currents propagating over periodic arrays of blunt obstacles: Effect of the obstacle size |
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| Authors: | T Tokyay G Constantinescu E Gonzalez-Juez E Meiburg |
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| Institution: | 1. Department of Civil and Environmental Engineering, University of Iowa, United States;2. Department of Mechanical Engineering, University of California, Santa Barbara, United States;1. Department of Water Engineering, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran;2. Agricultural Engineering Research Institute (AERI), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran;3. Department of Water Engineering, College of Agriculture, Isfahan University of Technology, Isfahan, Iran |
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| Abstract: | Gravity currents are considered that propagate over a series of identical ribs with square cross sections. Both large-eddy simulations and a shallow-water approach are applied to assess the influence of rib height and Reynolds number. The simulations elucidate the physical mechanisms governing the time-dependent evolution of the drag force, which are dominated by the formation of a recirculation region immediately downstream of each rib, in conjunction with a supercritical, jet-like flow region above and behind the rib, and an upstream propagating hydraulic jump that forms as a result of the interaction between the gravity current and the neighboring rib immediately downstream. The corresponding shallow-water analysis yields fair agreement, indicating that simplified models can provide useful information for the present class of flows. |
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