A priori and a posteriori error estimates of H1‐Galerkin mixed finite element method for parabolic optimal control problems. (17th March 2017)

• Record Type: Journal Article
• Authors: Shakya, Pratibha; Sinha, Rajen Kumar
• Is Part Of: Optimal control applications and methods. Volume 38:Number 6(2017)
• Page Start: 1056
• Page End: 1070
• Publication Date: 2017-03-17
• Subjects: a priori and a posteriori error estimates -- H1‐Galerkin mixed finite element method -- parabolic optimal control problems -- the backward Euler fully discrete scheme -- the semidiscrete scheme; Control theory -- Periodicals; Mathematical optimization -- Periodicals; 629.8312
• DOI: 10.1002/oca.2312
• Languages: English
• ISSNs: 0143-2087

Abstract

Summary: In this exposition, we study both a priori and a posteriori error analysis for the H 1 ‐Galerkin mixed finite element method for optimal control problems governed by linear parabolic equations. The state and costate variables are approximated by the lowest order Raviart‐Thomas finite element spaces, whereas the control variable is approximated by piecewise constant functions. Compared to the standard mixed finite element procedure, the present method is not subject to the Ladyzhenskaya‐Babuska‐Brezzi condition and the approximating finite element spaces are allowed to be of different degree polynomials. A priori error analysis for both the semidiscrete and the backward Euler fully discrete schemes are analyzed, and L ∞ ( L 2 ) convergence properties for the state variables and the control variable are obtained. In addition, L 2 ( L 2 )‐norm a posteriori error estimates for the state and control variables and L ∞ ( L 2 ) ‐norm for the flux variable are also derived.