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In this work, we investigate the interaction of free and porous media flow bylarge scale lattice Boltzmann simulations. We study the transport phenomena atthe porous interface on multiple scales, i.e., we consider both,computationally generated pore-scale geometries and homogenized models at amacroscopic scale. The pore-scale results are compared to those obtained byusing different transmission models. Two-domain approaches with sharp interfaceconditions, e.g., of Beavers--Joseph--Saffman type, as well as a single-domainapproach with a porosity depending viscosity are taken into account. For thepore-scale simulations, we use a highly scalable communication-reducing schemewith a robust second order boundary handling. We comment on computationalaspects of the pore-scale simulation and on how to generate pore-scalegeometries. The two-domain approaches depend sensitively on the choice of theexact position of the interface, whereas a well-designed single-domain approachcan significantly better recover the averaged pore-scale results.

Large scale lattice Boltzmann simulation for the coupling of free and porous media flow