We propose and analyze a new discretization technique for a linear-quadratic optimal control problem involving the fractional powers of a symmetric and uniformly elliptic second order operator; control constraints are considered. Since these fractional operators can be realized as the Dirichlet-to-Neumann map for a nonuniformly elliptic equation, we recast our problem as a nonuniformly elliptic optimal control problem. The rapid decay of the solution to this problem suggests a truncation that is suitable for numerical approximation. We propose a fully discrete scheme that is based on piecewise linear functions on quasi-uniform meshes to approximate the optimal control and first-degree tensor product functions on anisotropic meshes for the optimal state variable. We provide an a priori error analysis that relies on derived Hölder and Sobolev regularity estimates for the optimal variables and error estimates for a scheme that approximates fractional diffusion on curved domains; the latter being an extension of previous available results. The analysis is valid in any dimension. We conclude by presenting some numerical experiments that validate the derived error estimates.
Accepté le :
DOI : 10.1051/m2an/2016065
Keywords: Linear-quadratic optimal control problem, fractional diffusion, finite elements, anisotropic estimates, curved domains
Otárola, Enrique 1
@article{M2AN_2017__51_4_1473_0,
author = {Ot\'arola, Enrique},
title = {A piecewise linear {FEM} for an optimal control problem of fractional operators: error analysis on curved domains},
journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
pages = {1473--1500},
year = {2017},
publisher = {EDP Sciences},
volume = {51},
number = {4},
doi = {10.1051/m2an/2016065},
zbl = {1377.49030},
language = {en},
url = {https://www.numdam.org/articles/10.1051/m2an/2016065/}
}
TY - JOUR AU - Otárola, Enrique TI - A piecewise linear FEM for an optimal control problem of fractional operators: error analysis on curved domains JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 2017 SP - 1473 EP - 1500 VL - 51 IS - 4 PB - EDP Sciences UR - https://www.numdam.org/articles/10.1051/m2an/2016065/ DO - 10.1051/m2an/2016065 LA - en ID - M2AN_2017__51_4_1473_0 ER -
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Otárola, Enrique. A piecewise linear FEM for an optimal control problem of fractional operators: error analysis on curved domains. ESAIM: Mathematical Modelling and Numerical Analysis , Tome 51 (2017) no. 4, pp. 1473-1500. doi: 10.1051/m2an/2016065
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