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Error Estimates for the Optimal Control of a Parabolic Fractional PDE

Journal Article · · SIAM Journal on Numerical Analysis
DOI:https://doi.org/10.1137/19m1267581· OSTI ID:1828020
 [1];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Universidad Tecnica Federico Santa Maria, Valparaiso (Chile)

In this work, we consider the integral definition of the fractional Laplacian and analyze a linear-quadratic optimal control problem for the so-called fractional heat equation; control constraints are also considered. We derive existence and uniqueness results, first order optimality conditions, and regularity estimates for the optimal variables. To discretize the state equation we propose a fully discrete scheme that relies on an implicit finite difference discretization in time combined with a piecewise linear finite element discretization in space. We derive stability results and a novel $$L^2(0,T;L^2(\Omega))$$ a priori error estimate. On the basis of the aforementioned solution technique, we propose a fully discrete scheme for our optimal control problem that discretizes the control variable with piecewise constant functions, and we derive a priori error estimates for it. We illustrate the theory with one- and two-dimensional numerical experiments.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; Spanish National Fund for Scientific and Technological Development (FONDECYT)
Grant/Contract Number:
NA0003525
OSTI ID:
1828020
Report Number(s):
SAND--2020-14257J; 697280
Journal Information:
SIAM Journal on Numerical Analysis, Journal Name: SIAM Journal on Numerical Analysis Journal Issue: 2 Vol. 59; ISSN 0036-1429
Publisher:
Society for Industrial and Applied Mathematics (SIAM)Copyright Statement
Country of Publication:
United States
Language:
English

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