计算物理 ›› 2004, Vol. 21 ›› Issue (1): 21-26.
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聂德明, 林建忠
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NIE De-ming, LIN Jian-zhong
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摘要: 比较并讨论了几种格子Boltzmann方法(LBM)中的边界条件处理方法,对标准的壁面全反弹方法进行了改进,提高了壁面反弹方法的精度.通过采用d2q9模型对Poiseuille流和非定常Couette流进行数值模拟,获得了与分析解比较吻合的结果.针对不同的松弛时间τ和Re数,还给出了采取不同边界条件处理时的收敛精度,验证了小Re数时,LBM可以完全模拟N-S方程,由计算发现松弛时间τ接近1时的精度最高,τ较大时,误差较大.
关键词: 格子Boltzmann方法, 边界条件, 壁面反弹, 数值计算
Abstract: Comparison and discussion of several boundary conditions in lattice Boltzmann method are presented. To achieve improved accuracy, a new method based on the idea of standard bounce-back scheme is proposed. Numerical simulations for two-dimensional Poiseuille flow and unsteady Couette flow are carried out using d2q9 model, and the results are identical to the analytical solutions. The convergence for different boundary treatments is discussed by changing single relaxation time τ and Re number. The results show that LBM can recover Navier-Stokes equation at low Mach number. It is also indicated that the errors for large τ are much bigger than those for τ close to 1.
Key words: LBM, boundary conditions, bounce-back, numerical simulation
中图分类号:
O35
聂德明, 林建忠. 格子Boltzmann方法中的边界条件[J]. 计算物理, 2004, 21(1): 21-26.
NIE De-ming, LIN Jian-zhong. Boundary Conditions in Lattice Boltzmann Method[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2004, 21(1): 21-26.
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