Gubisch, Martin

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POD basis updates for nonlinear PDE control

2017, Gräßle, Carmen, Gubisch, Martin, Metzdorf, Simone, Rogg, Sabrina, Volkwein, Stefan

In the present paper a semilinear boundary control problem is considered. For its numerical solution proper orthogonal decomposition (POD) is applied. POD is based on a Galerkin type discretization with basis elements created from the evolution problem itself. In the context of optimal control this approach may suffer from the fact that the basis elements are computed from a reference trajectory containing features which are quite different from those of the optimally controlled trajectory. Therefore, different POD basis update strategies which avoids this problem of unmodelled dynamics are com- pared numerically.