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Russia Vladivostok
Section  Mathematics 
Title  Modeling the velocity field of twolayered creeping flow and some geophysical applications 
Author(s)  Pak V.V.^{a} 
Affiliations  Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences^{a} 
Abstract  We study the longtime evolution of axisymmetric freesurface twolayered creeping flow subject to the initial topography of its boundaries and bottom velocities. Each layer has uniform density and viscosity. The upper layer is assumed to have a smaller density than the lower layer. Based on lubrication approximation (the Reynolds equations) the nonlinear system of diffusiontype equations with respect to the surface and interface between the layers is obtained to describe this flow. Taking the dimensionless density contrast between the layers as a small parameter, we apply the method of asymptotic expansions to extract leadingterm approximation for the slowly varying largetime evolution of the governing equations. An asymptotic equation relating both surface and interface displacement to the bottom velocities is derived. Based on this equation, we develop the algorithm to calculate velocity fields within layers for large time. Streamlines are used to visualize the flow. Numerical results reveal stability of the streamlines in the upper layer under variation of the bottom velocity. As geophysical applications, the developed algorithm is used to evaluate the velocity field in the crust (the upper layer) beneath the largescale lunar multiring basins influenced by deep movements in the underlying mantle (the lower layer). To validate the results of modeling, we compare the calculated velocity fields with basin ridge systems obtained by experimental observations. The model comparison has shown proximity of radii of basin rings and critical points of the surface velocity. 
Keywords  multilayered flow, longwave approximation, Reynolds equations, nonlinear diffusion, ring structures 
UDC  532.5.032 
MSC  76D50 
DOI  10.20537/vm140106 
Received  21 November 2013 
Language  Russian 
Citation  Pak V.V. Modeling the velocity field of twolayered creeping flow and some geophysical applications, Vestnik Udmurtskogo Universiteta. Matematika. Mekhanika. Komp'yuternye Nauki, 2014, issue 1, pp. 6675. 
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