Based on a two dimensional lattice Boltzmann method coupled with large eddy simulation(LES),a LBM-LES model combined with sediment mathematic model is proposed for 2D siltladen flows in a pumping station forebay. Shallow water equations is numerically simulated by the mesoscopic LBM-BGK(Bhatnagar Gross Krook) model and the turbulence can be taken into account and modeled efficiently by a SubGridScale stress(SGS) model. A macroscopic 2D horizontal sediment mathematic model consists of suspension transport equations, riverbed deformation equations, formula of sedimentcarrying capacity, and so on. The segregating scheme is adopted to solve the governing equations for turbulent flows and sediment governing equations,i.e., the solutions to the turbulence governing equations,suspension transport equations, and sediment erosion ＆ deposition along the forebay bed are solved sequentially. Finally, the simulated velocity distribution is in agreement with the experimental data, and the depth distributions, the vortex position and size as well as the sediment erosiondeposition are successfully predicted in the forebay. All the calculation results agree well the hydrodynamic rules in nature. The numerical results show that this model can well reproduce the sediment laden flow patterns,sediment erosion and deposition in the forebay, and the mathematical model and numerical algorithms are accurate, reliable and feasible to predict the sediment laden flows in forebays.
Gao Chuanchang,Wang Yuchuan,Shi Liwen,et al. Technical measure for discontinuous trajectory bucket energy dissipation and sediment prevention at forebay of pumping station[J].Journal of Drainage and Irrigation Machinery Engineering,2011,29(2): 133-138.(in Chinese)