Abstract
In this paper, we study a priori error estimates for the finite volume element approximation of nonlinear optimal control problem. The schemes use discretizations based on a finite volume method. For the variational inequality, we use the method of the variational discretization concept to obtain the control. Under some reasonable assumptions, we obtain some optimal order error estimates. The approximate order for the state, costate and control variables is O(h 2) or $$O\left( {{h^2}\sqrt {\left| {\ln h} \right|} } \right)$$ in the sense of L 2-norm or L ∞-norm. A numerical experiment is presented to test the theoretical results. Finally, we give some conclusions and future works.
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