摘要
A multispecies, multispeed lattice Boltzmann model is presented to study the mass diffusion properties. At each node the total momentum of all particles and the partial masses of the particles of same species are conserved. Using the Chapman-Enskog method, we have derived from the BGK Boltzmann equation the N-S equation and partial mass conservation equations. We have compared the measured diffusivities with the theoretical values for different single relaxation time, showing good agreemellt. We have carried out the 2-D convection-diffusion simulations on a 16o × 100 hexagonal lattice. At the initial time we inject a bubble of radius r(= l6 nodes), at rest, filled with particles of one species into a uniform flow of particles of the other species. The mean velocity v = 0.5 is along the horizontal axis. One clearly observes the deformation and the diffusion of the bubble.
A multispecies, multispeed lattice Boltzmann model is presented to study the mass diffusion properties. At each node the total momentum of all particles and the partial masses of the particles of same species are conserved. Using the Chapman-Enskog method, we have derived from the BGK Boltzmann equation the N-S equation and partial mass conservation equations. We have compared the measured diffusivities with the theoretical values for different single relaxation time, showing good agreemellt. We have carried out the 2-D convection-diffusion simulations on a 16o × 100 hexagonal lattice. At the initial time we inject a bubble of radius r(= l6 nodes), at rest, filled with particles of one species into a uniform flow of particles of the other species. The mean velocity v = 0.5 is along the horizontal axis. One clearly observes the deformation and the diffusion of the bubble.
出处
《数值计算与计算机应用》
CSCD
北大核心
1998年第4期252-257,共6页
Journal on Numerical Methods and Computer Applications
基金
国家自然科学基金!19672O3O
国家教委留学回国人员经费资助
