Lattice Boltzmann Method for Aeroacoustic Simulations with Block-Structured Cartesian Grid

In this paper, we propose a computational approach based on Lattice Boltzman Method (LBM) and apply the method to the aeroacoustic simulations around complex geometries. In our approach, we couple LBM and Building-Cube Mehod (BCM), which is the framework of a block-structured Castesian grid approach proposed by Nakahashi, to enhace the parallel efficiency. To overcome the stability problem due to the treatment of collision operator in standard LBGK model, cascaded-LBM approach is used. Wall function is applied near the wall boundaries to model high-Reynolds number flows with unresolved computational grid. The proposed method is applied to several 2D and 3D problems for the validations and verifications.