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Effect of Downstream Channel Slope on Numerical Modelling of DAM Break Induced Flows

Author(s): A. E. Dincer; Z. Bozkus; A. N. Sahin

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Keywords: Dam break; turbulence modelling; Large Eddy Simulation; LES; k-εturbulence model; laminar flow

Abstract: In the present study, the numerical simulations of dam break induced flows are performed by using various models. The numerical models used in the study are laminar, large eddy simulation (LES) and Reynolds-Averaged Navier Stokes (RANS) equations with k-εturbulence model. In addition a recently developed Smoothed Particle Hydrodynamics (SPH) code is also used to simulate dam break problem. For the validation of the numerical approaches, a recently published experimental study is used. In the experimental study, an idealized dam break problem in a sloped channel is investigated. It is found that although other numerical approaches give similar velocity profiles with the experiments, RANS equations with k-εturbulence model gives underestimated results. The same problem is simulated by assuming that the downstream channel is not inclined, i.e. horizontal. It is observed that when the channel is not inclined, k-εturbulence model gives closer results to other numerical models. Therefore, it can be concluded that for dam break induced flows, slope of the channel may adversely affect the accuracy of k-εturbulence model. However, more experimental and numerical data is needed to validate this conclusion.


Year: 2016

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