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Published on: February 22, 2018
Asymptotic behaviour of Stokes flow in a thin domain with a moving rough boundary
J Fabricius1, Y O Koroleva2, A Tsandzana3
1Department of Engineering Sciences and Mathematics , Luleå University of Technology , Luleå 971 87, Sweden.
Abstract:
We consider a problem that models fluid flow in a thin domain bounded by two surfaces. One of the surfaces is rough and moving, whereas the other is flat and stationary. The problem involves two small parameters ϵ and μ that describe film thickness and roughness wavelength, respectively. Depending on the ratio λ=ϵ/μ, three different flow regimes are obtained in the limit as both of them tend to zero. Time-dependent equations of Reynolds type are obtained in all three cases (Stokes roughness, Reynolds roughness and high-frequency roughness regime). The derivations of the limiting equations are based on formal expansions in the parameters ϵ and μ.
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