Space-time finite element solvers for parabolic optimal control problems
Dr. Huidong YangDec. 1, 2020, 3:15 p.m. ZOOM
In this talk, we will present some numerical methods for optimal control of parabolic PDEs. In particular, we aim to minimize certain objective functionals subject to linear and nonlinear parabolic PDEs, and with proper constraints on the control variables. The objective functional may involve a Lipschitz continuous and convex but not Frechet differentiable term, and lead to spatiotemporally sparse optimal control. The space-time finite element discretization of the optimality system, including both the state and adjoint state equations, relies on a Galerkin-Petrov variational formulation employing piecewise linear finite elements on unstructured simplicial space-time meshes. The nonlinear optimality system is solved by means of the semismooth Newton method, whereas the linearized coupled state and adjoint state systems are solved by an algebraic multigrid preconditioned GMRES method.