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The Cahn-Hilliard-Hele-Shaw system with singular potential. (English) Zbl 1394.35356
Summary: The Cahn-Hilliard-Hele-Shaw system is a fundamental diffuse-interface model for an incompressible binary fluid confined in a Hele-Shaw cell. It consists of a convective Cahn-Hilliard equation in which the velocity \(u\) is subject to a Korteweg force through Darcy’s equation. In this paper, we aim to investigate the system with a physically relevant potential (i.e., of logarithmic type). This choice ensures that the (relative) concentration difference \(\phi\) takes values within the admissible range. To the best of our knowledge, essentially all the available contributions in the literature are concerned with a regular approximation of the singular potential. Here, we first prove the existence of a global weak solution with finite energy that satisfies an energy dissipative property. Then in dimension two, we further obtain the uniqueness and regularity of global weak solutions. In particular, we show that any two-dimensional weak solution satisfies the so-called strict separation property, namely, if \(\varphi\) is not a pure state at some initial time, then it stays instantaneously away from the pure states. When the spatial dimension is three, we prove the existence of a unique global strong solution, provided that the initial datum is regular enough and sufficiently close to any local minimizer of the free energy. This also yields the local Lyapunov stability of the local minimizer itself. Finally, we prove that under suitable assumptions any global solution converges to a single equilibrium as time goes to infinity.

MSC:
35Q35 PDEs in connection with fluid mechanics
35B40 Asymptotic behavior of solutions to PDEs
35B41 Attractors
76D27 Other free boundary flows; Hele-Shaw flows
35D30 Weak solutions to PDEs
35D35 Strong solutions to PDEs
76S05 Flows in porous media; filtration; seepage
35A02 Uniqueness problems for PDEs: global uniqueness, local uniqueness, non-uniqueness
35A01 Existence problems for PDEs: global existence, local existence, non-existence
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