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An efficient adaptive multigrid algorithm for predicting thin film flow on surfaces containing localised topographic features

Lee, Y.C., Thompson, H.M. and Gaskell, P.H. (2007) An efficient adaptive multigrid algorithm for predicting thin film flow on surfaces containing localised topographic features. Computers & Fluids, 36 (5). pp. 838-855. ISSN 0045-7930

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Gravity-driven continuous thin film flow over a plane, containing well-defined single and grouped topographic features, is modelled as a Stokes flow using lubrication theory. The associated time dependent, nonlinear, coupled set of governing equations are solved using a Full Approximation Storage (FAS) Multigrid algorithm by employing automatic mesh adaptivity, the power efficiency and accuracy of which is demonstrated by comparing the results with corresponding global fine-mesh solutions.. These show that automatic grid refinement effectively restricts the use of find grids to regions of rapid flow development which, for flow over the topographies considered, includes the topography itself, the upstream Capillary ridge, downstream sure region, and the characteristic bow wave. It is shown that for the accurate solution of such flow problems, adaptive Multigridding offers increased flexibility together with a significant reduction in memory requirement. This is further demonstrated by solving the problem of transient flow over a trench topography, generated by a sinusoidally varying inlet condition.

Item Type: Article
Copyright, Publisher and Additional Information: © 2006 Elsevier Ltd. This is an author produced version of a paper submitted to and subsequently published in Computers & Fluids. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: adaptivity, Multigrid, topography, thin film
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Engineering Thermofluids, Surfaces & Interfaces (iETSI) (Leeds)
Depositing User: Repository Officer
Date Deposited: 06 May 2008 17:03
Last Modified: 08 Feb 2013 17:05
Published Version: http://dx.doi.org/10.1016/j.compfluid.2006.08.006
Status: Published
Publisher: Elsevier
Refereed: No
Identification Number: 10.1016/j.compfluid.2006.08.006
URI: http://eprints.whiterose.ac.uk/id/eprint/3774

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