Abstract
In this paper, we consider a two-dimensional diffuse interface model for the phase separation of an incompressible and isothermal binary fluid mixture with matched densities. This model consists of the Navier–Stokes equations, nonlinearly coupled with a convective nonlocal Cahn–Hilliard equation. The system rules the evolution of the (volume-averaged) velocity \(\varvec{u}\) of the mixture and the (relative) concentration difference \(\varphi \) of the two phases. The aim of this work is to study an optimal control problem for such a system, the control being a time-dependent external force \(\varvec{v}\) acting on the fluid. We first prove the existence of an optimal control for a given tracking type cost functional. Then we study the differentiability properties of the control-to-state map \(\varvec{v}\mapsto [\varvec{u},\varphi ]\), and we establish first-order necessary optimality conditions. These results generalize the ones obtained by the first and the third authors jointly with Rocca (SIAM J Control Optim 54:221–250, 2016). There the authors assumed a constant mobility and a regular potential with polynomially controlled growth. Here, we analyze the physically more relevant case of a degenerate mobility and a singular (e.g., logarithmic) potential. This is made possible by the existence of a unique strong solution which was recently proved by the authors and Gal (WIAS preprint series No. 2309, Berlin, 2016).
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Acknowledgements
Sergio Frigeri and Maurizio Grasselli are members of the Gruppo Nazionale per l’Analisi Matematica, la Probabilità e le loro Applicazioni (GNAMPA) of the Istituto Nazionale di Alta Matematica (INdAM). Sergio Frigeri is “titolare di un Assegno di Ricerca dell’Istituto Nazionale di Alta Matematica”.
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Frigeri, S., Grasselli, M. & Sprekels, J. Optimal Distributed Control of Two-Dimensional Nonlocal Cahn–Hilliard–Navier–Stokes Systems with Degenerate Mobility and Singular Potential. Appl Math Optim 81, 899–931 (2020). https://doi.org/10.1007/s00245-018-9524-7
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DOI: https://doi.org/10.1007/s00245-018-9524-7
Keywords
- Navier–Stokes equations
- Nonlocal Cahn–Hilliard equations
- Degenerate mobility
- Incompressible binary fluids
- Phase separation
- Distributed optimal control
- First-order necessary optimality conditions