A lattice Boltzmann model coupled with a Large Eddy Simulation model for flows around a groyne

查看全文 作　　者：Xin [1]YU;Xuelin [2]TANG;Wuchang [3]WANG;Fujun [4]WANG;Zhicong [5]CHEN;Xiaoyan [6]SHI

机构地区：[1]Doctoral student, College of Water Conservancy & Civil Engineering, China Agricultural University, Beijing 100083, China; Senior Engineer, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China.;[2]Assoc. Prof., College of Water Conservancy & Civil Engineering, China Agricultural University, Beijing 100083, China. Corresponding author,;[3]Graduate Student, College of Water Conservancy &Civii Engineering, China Agricultural University, Beijing 100083, China.;[4]Prof., College of Water Conservancy & Civil Engineering, China Agricultural University, Beijing 100083, China.;[5]Prof., State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China.;[6]Assoc. Prof., College of Water Conservancy & Civil Engineering, China Agricultural University, Beijing 100083, China.

出　　处：《International Journal of Sediment Research》索引2010年第25卷第3期,共12页

基　　金：supported by the National Natural Science Foundation of China (No.50779069, No. 50976124) ;the Beijing Natural Science Foundation (3083022);Open Fund of Key Laboratory of Yellow River Sediment Research of the Ministry of Water Resources (No.200903);the National Science and Technology Supporting Programs in the 11th Five-Year Plan (2006BAB06B02);the Chinese Universities Scientific Fund (No. 2009-1-90, No. 2009-2-12) ;the Program for Changjiang Scholars and Innovative Research Team in University (No.PCSIRT0657) 摘　　要：This present paper proposes a two-dimensional lattice Boltzmann model coupled with a Large Eddy Simulation (LES) model and applies it to flows around a non-submerged groyne in a channel. The LES of shallow water equations is efficiently performed using the Lattice Boltzmann Method (LBM) and the turbulence can be taken into account in conjunction with the Smagorinsky Sub-Grid Stress (SGS) model. The bounce-back scheme of the non-equilibrium part of the distribution function is used to determine the unknown distribution functions at inflow boundary, the zero gradient of the distribution function is set normal to outflow boundary to obtain the unknown distribution functions here and the bounce-back scheme, which states that an incoming particle towards the boundary is bounced back into fluid, is applied to the solid wall to ensure non-slip boundary conditions. The initial flow field is defined firstly and then is used to calculate the local equilibrium distributions as initial conditions of the distribution functions. These coupled models successfully predict the flow characteristics, such as circulating flow, velocity and water depth distributions. The comparisons between the simulated results and the experimental data show that the model scheme has the capacity to solve the complex flows in shallow water with reasonable accuracy and reliability. 关键词：格子BOLTZMANN模型模拟模型非淹没丁坝耦合流动大涡模拟条件分布函数滑移边界条件格子玻尔兹曼方法

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A lattice Boltzmann model coupled with a Large Eddy Simulation model for flows around a groyne

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