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• W2899875571 abstract "A macroscopic boundary condition to be used when a fluid flows over a rough surface is derived. It provides the slip velocity $boldsymbol{u}_{S}$ on an equivalent (smooth) surface in the form $boldsymbol{u}_{S}=unicode[STIX]{x1D716}{mathcal{L}}boldsymbol{ : }{mathcal{E}}$ , where the dimensionless parameter $unicode[STIX]{x1D716}$ is a measure of the roughness amplitude, ${mathcal{E}}$ denotes the strain-rate tensor associated with the outer flow in the vicinity of the surface and ${mathcal{L}}$ is a third-order slip tensor arising from the microscopic geometry characterizing the rough surface. This boundary condition represents the tensorial generalization of the classical Navier slip condition. We derive this condition, in the limit of small microscopic Reynolds numbers, using a multi-scale technique that yields a closed system of equations, the solution of which allows the slip tensor to be univocally calculated, once the roughness geometry is specified. We validate this generalized slip condition by considering the flow about a rough sphere, the surface of which is covered with a hexagonal lattice of cylindrical protrusions. Comparisons with direct numerical simulations performed in both laminar and turbulent regimes allow us to assess the validity and limitations of this condition and of the mathematical model underlying the determination of the slip tensor ${mathcal{L}}$ ." @default.
• W2899875571 created "2018-11-16" @default.
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• W2899875571 date "2018-11-06" @default.
• W2899875571 modified "2023-10-02" @default.
• W2899875571 title "Generalized slip condition over rough surfaces" @default.
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• W2899875571 doi "https://doi.org/10.1017/jfm.2018.780" @default.
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