2025 Volume 81 Issue 16 Article ID: 24-16198
The Lattice Boltzmann Method (LBM) is a fully explicit computational method with high parallel efficiency. While its development for tsunami analysis is active, there is only a few hydrodynamic models for environmental flows appeared in high aspect-ratio water bodies such as lakes and coastal area. Additionally, the use of the no-slip condition at boundaries increases computational cost as it requires a large number of lattices near the wall. Therefore, in this study, we have developed LBM employing high aspect-ratio lattice together with a wall function to reduce the computational cost in environmental flows. We examined the present LBM model with a lock-exchange flow and internal wave generation problems. Although the lattice flattering tends to cause the numerical diffusion near the density interface, the results show reasonable agreements with the previous numerical models and laboratory experiment.
