Abstract
The Lattice Boltzmann Method (LBM) is a well established computational tool for fluid flow simulations. This method has been utilized for low Mach number Computational Aeroacoustics (CAA). Robust and nonreflective boundary conditions, similar to those used in Navier-Stokes solvers, are needed for LBM-based CAA. One challenge is that proper boundary conditions be specified in terms of the particle distribution function rather than the usual hydrodynamic properties. The focus of the present study was to develop radiation boundary conditions and perfectly matched layers (PML) for LBM. Such boundary conditions were formulated and tested using benchmark acoustic problems. The perfectly matched layer concept appears to be very well suited for LBM, and yielded very low acoustic reflection factor.
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