A posteriori error estimates for fourth order hyperbolic control problems by mixed finite element methods

摘要

In this paper, we consider the a posteriori error estimates of the mixed finite element method for the optimal control problems governed by fourth order hyperbolic equations. The state is discretized by the order k Raviart–Thomas mixed elements and control is discretized by piecewise polynomials of degree?k. We adopt the mixed elliptic reconstruction to derive the a posteriori error estimates for both the state and the control approximations.