Applications of Three-Dimensional LBM-LES Combined Model for Pump Intakes  

作　　者：Miao Guo Xuelin Tang Yanwen Su Xiaoqin Li Fujun Wang 

机构地区：[1]College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China [2]Beijing Engineering Research Centre of Safety and Energy Saving Technology for Water SupplyNetwork System,China AgriculturalUniversity,Beijing 100083,China

出　　处：《Communications in Computational Physics》2018年第6期104-122,共19页计算物理通讯（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.51479196,51179192,51139007);the Program for New Century Excellent Talents in University(NCET)(Grant No.NETC-10-0784).

摘　　要：Lattice Boltzmannmodel(LBM)in conjunction with an accurate Large Eddy Simulation(LES)technology was proposed to simulate various vortical structures and their evolutions in open pump intakes.The strain rate tensor in the LES model is locally calculated by means of non-equilibrium moments based on Chapman-Enskog expansion,and bounce-back scheme was used for non-slip condition on solid walls and reflection scheme for free surface.The presentedmodel was applied to investigate free-surface and wall-attached vortices for different water levels and flow rate.The vortex position,shapes and vorticities were predicted successfully under three flowing cases(i.e.critical water level(CWL),lower water level,lower flow rate),and the numerical velocity and streamline distribution were analyzed systematically.For CWL based on Froude number considering open channel flows,the shape and the location of various dynamic vortices were captured.Compare to the experimental results of CWL,more vortices were predicted for lower water level,and less vortices were observed for lower flow rate.The predicted velocities and vortex locations are in good agreement with the experimental of a small physical model.The comparisons demonstrated the feasibility and stability of above-mentioned model and numerical method in predicting vortex flows inside open pump intakes.

关 键 词：Lattice Boltzmannmodel Large Eddy Simulation free-surface vortices wall-attached vortices open pump intakes 

分 类 号：O35[理学—流体力学]