A direct-hybrid CFD/CAA method based on lattice Boltzmann and acoustic perturbation equations

The accuracy of two direct coupled two-step CFD/CAA methods is discussed. For the flow field either a finite-volume (FV) method for solution Navier–Stokes equations or lattice Boltzmann (LB) to discontinuous Galerkin (DG) acoustic perturbation equations. coupling takes advantage joint Cartesian mesh allowing exchange sources without MPI communication. An immersed boundary treatment scattering from solid bodies by novel wall formulation implemented and validated in DG method. Results case spinning vortex pair low Reynolds number unsteady around circular cylinder show that with comparable obtained direct-hybrid when using identical resolution.