Space-time finite element solvers for parabolic optimal control problems

Dr. Huidong Yang

Dec. 1, 2020, 4:15 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.