Abstract
A non-Newtonian fluid flows in a free domain and in a periodically perforated thin layer which are connected through a permeable interface. Two scales are present in the porous layer: one associated to the periodicity of the distribution of the channels which is associated to the thinness of the layer and the other to the diameter of these channels. Using Γ-convergence and two-scale convergence methods, we derive boundary conditions of Beavers–Joseph–Saffman type on the permeable interface between the free domain and the thin layer.
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