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Schematic showing (a) subsampling of segmented volume, (b) subsampled geometry with boundaries Γx k, Γx j, and Γ for k=1, (c) the resulting truly periodic geometry created by reflection of the subsampled region in the x-, y-, and z-axis, and (d) a typical solution to the cell problem showing the absolute velocity. (This figure is available in colour at JXB online.)
