Abstract
We prove existence and regularity for the solutions to a Cahn–Hilliard system describing the phenomenon of phase separation for a material contained in a bounded and regular domain. Since the first equation of the system is perturbed by the presence of an additional maximal monotone operator, we show our results using suitable regularization of the nonlinearities of the problem and performing some a priori estimates which allow us to pass to the limit thanks to compactness and monotonicity arguments. Next, under further assumptions, we deduce a continuous dependence estimate whence the uniqueness property is also achieved. Then, we consider the related sliding mode control (SMC) problem and show that the chosen SMC law forces a suitable linear combination of the temperature and the phase to reach a given (space-dependent) value within finite time.
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Acknowledgements
The author is very grateful to Professor Pierluigi Colli for his advice, for his kind helpfulness and for several precious discussions. Moreover, MC expresses his gratitude to the referee for the careful reading of the manuscript and for a number of useful suggestions. Some partial support from the GNAMPA (Gruppo Nazionale per l’Analisi Matematica, la Probabilità e le loro Applicazioni) of INdAM is acknowledged.
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Colturato, M. On a Class of Conserved Phase Field Systems with a Maximal Monotone Perturbation. Appl Math Optim 78, 545–585 (2018). https://doi.org/10.1007/s00245-017-9415-3
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DOI: https://doi.org/10.1007/s00245-017-9415-3
Keywords
- Cahn–Hilliard system
- Phase separation
- Initial-boundary value problem
- Existence
- Continuous dependence
- sliding mode control