Abstract
We present a hierarchical solution concept for optimization problems governed by the time-dependent Navier–Stokes system. Discretisation is carried out with finite elements in space and a one-step-θ-scheme in time. By combining a Newton solver for the treatment of the nonlinearity with a space-time multigrid solver for linear subproblems, we obtain a robust solver whose convergence behaviour is independent of the refinement level of the discrete problem. A set of numerical examples analyses the solver behaviour for various problem settings with respect to efficiency and robustness of this approach.
Mathematics Subject Classification (2000). 35Q30, 49K20, 49M05, 49M15, 49M29, 65M55, 65M60, 76D05, 76D55.
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Hinze, M., Köster, M., Turek, S. (2012). A Space-Time Multigrid Method for Optimal Flow Control. In: Leugering, G., et al. Constrained Optimization and Optimal Control for Partial Differential Equations. International Series of Numerical Mathematics, vol 160. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-0133-1_8
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DOI: https://doi.org/10.1007/978-3-0348-0133-1_8
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