Particle flow simulations with homogenised lattice Boltzmann methods  

作　　者：Mathias J. Krause Fabian Klemens Thomas Henn Robin Trunk Hermann Nirschl 

机构地区：[1]Institute for Applied and Numerical Mathematics, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany [2]Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany

出　　处：《Particuology》2017年第5期1-13,共13页颗粒学报（英文版）

摘　　要：An alternative approach to simulating arbitrarily shaped particles submersed in viscous fluid in two dimensions is proposed, obtained by adapting the velocity parameter of the equilibrium distribution function of a standard lattice Boltzmann method （LBM）. Comparisons of exemplifying simulations to results in the literature validate the approach as well as the convergence analysis. Pressure fluctuations occurring in Ladd＇s approach are greatly reduced. In comparison with the immersed boundary method, this approach does not require cost intensive interpolations. The parallel efficiency of LBM is retained. An intrinsic momentum transfer is observed during particle-particle collisions. To demonstrate the capa- bilities of the approach, sedimentation of particles of several shapes is simulated despite omitting an explicit particle collision model.An alternative approach to simulating arbitrarily shaped particles submersed in viscous fluid in two dimensions is proposed, obtained by adapting the velocity parameter of the equilibrium distribution function of a standard lattice Boltzmann method （LBM）. Comparisons of exemplifying simulations to results in the literature validate the approach as well as the convergence analysis. Pressure fluctuations occurring in Ladd＇s approach are greatly reduced. In comparison with the immersed boundary method, this approach does not require cost intensive interpolations. The parallel efficiency of LBM is retained. An intrinsic momentum transfer is observed during particle-particle collisions. To demonstrate the capa- bilities of the approach, sedimentation of particles of several shapes is simulated despite omitting an explicit particle collision model.

关 键 词：Particulate flow simulationsArbitrarily shaped particlesLattice Boltzmann methodsValidationSedimentation processes 

分 类 号：O35[理学—流体力学] TU411.3[理学—力学]