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A Nitsche-eXtended Finite Element Method for Distributed Optimal Control Problems of Elliptic Interface Equations

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Published/Copyright: June 13, 2019

Abstract

This paper analyzes an interface-unfitted numerical method for distributed optimal control problems governed by elliptic interface equations. We follow the variational discretization concept to discretize the optimal control problems and apply a Nitsche-eXtended finite element method to discretize the corresponding state and adjoint equations, where piecewise cut basis functions around the interface are enriched into the standard linear element space. Optimal error estimates of the state, co-state and control in a mesh-dependent norm and the L2 norm are derived. Numerical results are provided to verify the theoretical results.

MSC 2010: 49J20; 65M60

Award Identifier / Grant number: 11771312

Funding statement: This work was supported by National Natural Science Foundation of China (11771312).

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Received: 2018-10-07
Revised: 2019-01-02
Accepted: 2019-05-03
Published Online: 2019-06-13
Published in Print: 2020-04-01

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