Title

A Superconvergent HDG Method for Distributed Control of Convection Diffusion PDEs

Abstract

We consider a distributed optimal control problem governed by an elliptic convection diffusion PDE, and propose a hybridizable discontinuous Galerkin method to approximate the solution. We use polynomials of degree k + 1 to approximate the state and dual state, and polynomials of degree k ≥ 0 to approximate their fluxes. Moreover, we use polynomials of degree k to approximate the numerical traces of the state and dual state on the faces, which are the only globally coupled unknowns. We prove optimal a priori error estimates for all variables when k ≥ 0. Furthermore, from the point of view of the number of degrees of freedom of the globally coupled unknowns, this method achieves superconvergence for the state, dual state, and control when k ≥ 1. We illustrate our convergence results with numerical experiments.

Department(s)

Mathematics and Statistics

Keywords and Phrases

Convection diffusion equation; Distributed optimal control; Error analysis; Hybridizable discontinuous Galerkin method; Superconvergence

International Standard Serial Number (ISSN)

0885-7474; 1573-7691

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2018 Springer, All rights reserved.

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