Boundary conditions for the lattice Boltzmann method in the case of viscous mixing flows

摘要: Abstract This paper examines the performance of different boundary condition strategies for lattice Boltzmann simulation industrial viscous mixing flows. Three were chosen from most popular approaches, which are staircase approaches (bounce-back rules), extrapolation or interpolation methods, and immersed methods. First, order convergence selected methods to impose conditions is verified on 3D Couette flow. work clearly shows that only method capable preserving second accuracy method. Second, a highly parallel LBM scheme used simulate fluid flow with close-clearance systems in Lagrangian frame reference. The rates obtained compared basis two characteristic numbers, power number pumping rate. results agree well experimental data finite element results, surprisingly enough, modified bounce back rule provides reliable despite its simplicity. Finally, impact workload balance memory usage analyzed. It appears strategy modifies efficiency method, yet no significant effect observed usage.