This paper presents an overset grid strategy in the context of a hybrid lattice Boltzmann -Navier-Stokes method for unsteady aerodynamic and aeroacoustic applications. While the overset grid approach is usually used to couple multiple overlapping grids with different mesh topologies together through interpolations, it is proposed to extend this methodology by enabling to switch between numerical methods across the grids making up the computational domain. Thereby, one can reach nearly optimal running conditions in terms of meshing strategy and numerical properties for the simulation of high Reynolds number flows. The key feature of this work lies in the way the information exchange is performed at the interface between the lattice Boltzmann method (applied on Cartesian grids) and the finite-volume Navier-Stokes method (dedicated to curvilinear meshes). All the numerical aspects of the coupling procedure are thoroughly discussed and the developed strategy is assessed on unsteady test cases representative of aerodynamic and aeroacoustic problems.
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