Existence and weak-strong uniqueness for Maxwell-Stefan-Cahn-Hilliard systems

Xiaokai Huo, Ansgar Jüngel, Athanasios Tzavaras

Research output: Contribution to journalArticlepeer-review


A Maxwell–Stefan system for fluid mixtures with driving forces depending on Cahn–Hilliard-type chemical potentials is analyzed. The corresponding parabolic crossdiffusion equations contain fourth-order derivatives and are considered in a bounded domain with no-flux boundary conditions. The nonconvex part of the energy is assumed to have a bounded Hessian. The main difficulty of the analysis is the degeneracy of the diffusion matrix, which is overcome by proving the positive definiteness of the matrix on a subspace and using the Bott–Duffin matrix inverse. The global existence of weak solutions and a weak-strong uniqueness property are shown by a careful combination of (relative) energy and entropy estimates, yielding H2 (Ω) bounds for the densities, which cannot be obtained from the energy or entropy inequalities alone.
Original languageEnglish (US)
JournalAccepted by Annales de l'Institut Henri Poincaré C, Analyse non linéaire
StatePublished - Feb 26 2023

Bibliographical note

KAUST Repository Item: Exported on 2023-02-27
Acknowledgements: XH and AJ acknowledge partial support from the Austrian Science Fund (FWF), grants P33010, W1245, and F65. AET acknowledges support from baseline funds of the King Abdullah University of Science and Technology (KAUST). This work has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme, ERC Advanced Grant no. 101018153.


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