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Effective slip law for general viscous flows over an oscillating surface
Author(s) -
Mikelić Andro,
Nečasová Šárka,
NeussRadu Maria
Publication year - 2013
Publication title -
mathematical methods in the applied sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.719
H-Index - 65
eISSN - 1099-1476
pISSN - 0170-4214
DOI - 10.1002/mma.2923
Subject(s) - mathematics , solenoidal vector field , hagen–poiseuille equation , mathematical analysis , norm (philosophy) , boundary layer , bounded function , slip (aerodynamics) , geometry , vector field , flow (mathematics) , mechanics , law , physics , political science , thermodynamics
We consider the non‐stationary three‐dimensional viscous flow in a bounded domain, with the lateral surface containing microscopic surface irregularities. Under the assumption of a smooth flow in the domain without roughness, we prove that there is a smooth solution to a problem with the rough boundary. In the papers by Jäger and Mikelić, the friction law was obtained as a perturbation of the Poiseuille flows. Here, the situation is more complicated. Nevertheless, after studying the corresponding boundary layers and using the results on solenoidal vector fields in domains with rough boundaries, we obtain rigorously the Navier friction condition. It is valid when the size and amplitude of the imperfections tend to zero. Furthermore, the friction matrix in the law is determined through a family of auxiliary boundary‐layer type problems. Effective equations approximate velocity at order O ( ε ) in the H 1 ‐norm, uniformly in time, and O( ε 3 ∕ 2 ) in the L 2 ‐norm, also uniformly in time. Approximation for the pressure is O( ε 3 ∕ 2 ) in theL loc 2 ‐norm. Copyright © 2013 John Wiley & Sons, Ltd.