A new adaptive local mesh refinement algorithm and its application on fourth order thin film flow problem

A new adaptive local mesh refinement method is presented for thin film flow problems containing moving contact lines. Based on adaptation on an optimal interpolation error estimate in the Lp norm (1<p⩽∞) [L. Chen, P. Sun, J. Xu, Multilevel homotopic adaptive finite element methods for convection...

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Bibliographic Details
Published in:Journal of computational physics Vol. 224; no. 2; pp. 1021 - 1048
Main Authors: Sun, Pengtao, Russell, Robert D., Xu, Jinchao
Format: Journal Article
Language:English
Published: Amsterdam Elsevier Inc 10.06.2007
Elsevier
Subjects:
Adaptive mesh
Computational techniques
Exact sciences and technology
Local refinement
Mathematical methods in physics
Mixed finite element method
Moving contact lines
Physics
Thin film flow
Adaptive mesh
Mixed finite element method
Local refinement
Moving contact lines
Thin film flow
Degrees of freedom
Difference scheme
Partial differential equations
Decomposition method
Adaptive method
Sun
Convection
Calculation methods
Thin films
Regularization method
Finite element method
Algorithms
Numerical solution
Optimal solution
Optimal approximation
Calculation
Mesh method
ISSN:0021-9991, 1090-2716
Online Access:Get full text
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Summary:A new adaptive local mesh refinement method is presented for thin film flow problems containing moving contact lines. Based on adaptation on an optimal interpolation error estimate in the Lp norm (1<p⩽∞) [L. Chen, P. Sun, J. Xu, Multilevel homotopic adaptive finite element methods for convection dominated problems, in: Domain Decomposition Methods in Science and Engineering, Lecture Notes in Computational Science and Engineering 40 (2004) 459–468], we obtain the optimal anisotropic adaptive meshes in terms of the Hessian matrix of the numerical solution. Such an anisotropic mesh is optimal for anisotropic solutions like the solution of thin film equations on moving contact lines. Thin film flow is described by an important type of nonlinear degenerate fourth order parabolic PDE. In this paper, we address the algorithms and implementation of the new adaptive finite element method for solving such fourth order thin film equations. By means of the resulting algorithm, we are able to capture and resolve the moving contact lines very precisely and efficiently without using any regularization method, even for the extreme degenerate cases, but with fewer grid points and degrees of freedom in contrast to methods on a fixed mesh. As well, we compare the method theoretically and computationally to the positivity-preserving finite difference scheme on a fixed uniform mesh which has proven useful for solving the thin film problem.
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ISSN:0021-9991
1090-2716
DOI:10.1016/j.jcp.2006.11.005