摘要
In this paper,we consider parabolic distributed control problems with cost functional of pointwise observation type either in space or in time.First,we show the well-posedness of the optimization problems and derive the first order optimality systems,where the adjoint state can be expressed as the linear combination of solutions to two backward parabolic equations that involve the Dirac delta distribution as source either in space or in time.Second,we use a space-time finite element method to discretize the control problems,where the state variable is approximated by piecewise constant functions in time and continuous piecewise linear polynomials in space,and the control variable is discretized by following the variational discretization concept.We obtain a priori error estimates for the control and state variables with order O(k 12+h)up to a logarithmic factor under the L 2-norm.Finally,we perform several numerical experiments to support our theoretical results.
基金
supported in part by the Strategic Priority Research Program of Chi-nese Academy of Sciences(Grant No.XDB 41000000)
the National Key Basic Research Program(Grant No.2018YFB0704304)
the National Natural Science Foundation of China(Grants No.12071468,11671391)
Xiaoping Xie was supported in part by the National Natural Science Foundation of China(Grants No.12171340,11771312).