Abstract
The paper presents a numerical study for the finite element method with anisotropic meshes. We compare the accuracy of the numerical solutions on quasi-uniform, isotropic, and anisotropic meshes for a test problem which combines several difficulties of a corner singularity, a peak, a boundary layer, and a wavefront. Numerical experiment clearly shows the advantage of anisotropic mesh adaptation. The conditioning of the resulting linear equation system is addressed as well. In particular, it is shown that the conditioning with adaptive anisotropic meshes is not as bad as generally assumed.
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Notes
- 1.
In this paper the aspect ratio of a triangular element is defined as the longest edge divided by the shortest altitude. For example, an equilateral triangle has an aspect ratio of \(2/\sqrt{3} \approx 1.15\).
- 2.
Note that \(O({N}^{-0.5}) = O(h)\) for quasi-uniform meshes in 2D.
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Acknowledgements
This research was supported in part by the National Science Foundation (U.S.A.) through grant DMS-1115118 and the German Research Foundation through grants SFB568/3, SPP1276 (MetStroem) and KA 3215/1-1. The authors are grateful to the anonymous referee for the valuable comments.
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Huang, W., Kamenski, L., Lang, J. (2013). Adaptive Finite Elements with Anisotropic Meshes. In: Cangiani, A., Davidchack, R., Georgoulis, E., Gorban, A., Levesley, J., Tretyakov, M. (eds) Numerical Mathematics and Advanced Applications 2011. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-33134-3_4
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