Coupling finite volume and lattice Boltzmann methods for the simulation of high-Reynolds-number flows
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Multiscale problems are ubiquitous in the engineering applications and their solution represents a big challenge especially when involving turbulent flows [1]. To address this problem, a novel framework is presented that bi-directionally couples a macroscopic-based finite volume method and the mesoscopic-based lattice Boltzmann method (LBM). To improve numerical stability of the simulation, the LBM solver is equipped with the central-moments-based collision operator. The computational domain is split into sub-regions which are solved independently. The exchange of information at the frontier between the two is enforced by an ad-hoc technique. The effectiveness of the proposed approach is assessed against the three-dimensional lid-driven cavity flows at Re=5000. Making reference at Figure 1, results obtained by our coupling framework are in excellent agreement with reference data [2], and it is able to capture accurately the vortices in the coupling region.
