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DDC: 510 × Subject: a priori error estimates ×

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    Pressure-robustness in the context of optimal control
    (Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2022) Merdon, Christian; Wollner, Winnifried
    This paper studies the benefits of pressure-robust discretizations in the scope of optimal control of incompressible flows. Gradient forces that may appear in the data can have a negative impact on the accuracy of state and control and can only be correctly balanced if their L2-orthogonality onto discretely divergence-free test functions is restored. Perfectly orthogonal divergence-free discretizations or divergence-free reconstructions of these test functions do the trick and lead to much better analytic a priori estimates that are also validated in numerical examples.