Abstract
The \(hp\)-FEM is an adaptive version of the Finite Element Method (FEM) that is capable of achieving fast exponential convergence rates by combining optimally spatial refinements (\(h\)-adaptivity) with varying element polynomial degrees (\(p\)-adaptivity). We present a novel space-time adaptive \(hp\)-FEM algorithm that is capable of capturing accurately traveling sharp fronts in nonlinear time-dependent problems. The algorithm tries to assess the true approximation error directly (not via residuals or related techniques), and it does not involve any tuning parameters exposed to the user. The algorithm is compared to non-adaptive FEM as well as to adaptive FEM with low-order elements in the context of a model problem with moving sharp front that consists of two coupled nonlinear parabolic equations. Also the treatment of nonlinear terms is discussed and it is shown that replacing the Newton’s method with simpler linearizations can lead to considerable errors.
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Notes
For download, tutorial, and examples visit http://hpfem.org/.
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Acknowledgments
This research was supported by the U.S. Department of Energy Battelle Energy Alliance Contract No. 89911, and by the Grant No. P105/10/1682 of the Grant Agency of the Czech Republic.
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Solin, P., Korous, L. Space-time adaptive \(hp\)-FEM for problems with traveling sharp fronts. Computing 95 (Suppl 1), 709–722 (2013). https://doi.org/10.1007/s00607-012-0243-7
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DOI: https://doi.org/10.1007/s00607-012-0243-7