A New Multi-Level Grid Multiple-Relaxation-Time Lattice Boltzmann Method with Spatial Interpolation

The traditional multi-level grid multiple-relaxation-time lattice Boltzmann method (MRT-LBM) requires interpolation calculations in time and space. It is a complex computationally intensive process. By using the buffer technique, this paper proposes new MRT-LBM which only spatial calculations. proposed uses center point format to store information. type determination flow field calculation domain done axis aligned bounding box (AABB) triangle overlap test. According characteristics of MRT-LBM, for first at interface different levels grids, used remove temporal simplify calculation. corresponding algorithm also presented two-dimensional three-dimensional problems. For problem around circular cylinder, simulation results show that four-level can accurately obtain aerodynamic coefficients Strouhal number Reynolds numbers, it has about 1/9 total grids as single-level 6.76 times faster. problem, numerical experiments past sphere are simulated verify precision numbers = 100, 200, 250, 300, 1000. With streamlines velocity contours, demonstrated be calculated even size grids.