A lattice Boltzmann direct coupling overset approach for the moving boundary problem

We propose a new direct coupling scheme based on the overset technique to tackle moving boundary problems within lattice Boltzmann framework. The is interpolation of distribution functions rather than moments, that is, macroscopic variables, and includes an additional hypothesis ensuring mass momentum conservation at interface nodes between fixed grids. method assessed considering four test cases both vortical acoustic fields. It shown results are in very good agreement with reference configuration without any subdomain. Moreover, it demonstrated provides improvement accuracy algorithm for aeroacoustics. In particular, convected vortex case studied reveals approach leads better ability conserve structure over time, as well reduction spurious distorsions fixed/moving interface.