Slip-Flow over Lubricated Surfaces |
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Authors: | Stian Solbakken Helge I Andersson Jens Neumann |
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Institution: | (1) Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway;(2) Universität der Bundeswehr München, 85577 Neubiberg, Germany |
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Abstract: | Slip-flow boundary conditions have been used in a direct numerical simulation of incompressible turbulent flow in a plane lubricated channel to mimic the unsteady dynamics of the thin lubricating films present at both channel walls. The results are compared with data from a full simulation, in which also the flow inside the lubrication layers was resolved. By replacing the lubrication layers with the slip-flow conditions, both turbulence statistics and coherent near-wall structures in the bulk-fluid are surprisingly well reproduced. In this approach the need to resolve the flow within the lubricating films is eliminated and the computational efforts are therefore reduced. |
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Keywords: | lubrication direct numerical simulation turbulence slip-flow boundary conditions |
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