Abstract
We consider the Laplace-Dirichlet equation in a polygonal domain perturbed at the small scale ε near a vertex.We assume that this perturbation is selfsimilar, i.e., derives from the same pattern for all relevant values of ε.We construct and validate asymptotic expansions of the solution in powers of ε via two diferent techniques, namely the method of multiscale expansions and the method of matched asymptotic expansions. Then we show how the terms of each expansion can be split into a finite number of sub-terms in order to reconstruct the other expansion. Compared with the fairly general approach of Maz–ya, Nazarov, and Plamenevskii relying on multiscale expansions, the novelty of our paper is the rigorous validation of the method of matched asymptotic expansions, and its comparison with the multiscale method. The consideration of a model problem allows us to simplify the exposition of these rather complicated two techniques.
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Dauge, M., Tordeux, S., Vial, G. (2010). Selfsimilar Perturbation near a Corner: Matching Versus Multiscale Expansions for a Model Problem. In: Laptev, A. (eds) Around the Research of Vladimir Maz'ya II. International Mathematical Series, vol 12. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1343-2_4
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DOI: https://doi.org/10.1007/978-1-4419-1343-2_4
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