Local Well-Posedness for a Diffuse Interface Model for Two-Phase Flows from Mixture Theory

Helmut Abels; Harald Garcke; Julia Wittmann

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arXiv · 2607.29298

Local Well-Posedness for a Diffuse Interface Model for Two-Phase Flows from Mixture Theory

Helmut Abels·Harald Garcke·Julia Wittmann

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Abstract

Local-in-time well-posedness is established for a recently proposed diffuse interface model describing incompressible two-phase flows. The result constitutes the first analytical study of a model introduced by ten Eikelder et al. for the motion of a binary mixture of macroscopically immiscible, viscous, incompressible fluids with unmatched densities. In contrast to classic diffuse interface models based on a single mean velocity, this model is derived within the framework of mixture theory, assigning each phase its own momentum and mass balance, which results in a system of two coupled Navier--Stokes equations and two mass transport equations. The proof of the well-posedness result uses a fixed-point strategy, where the main difficulty lies in the analysis of the principal part of the associated linearized system.

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Helmut Abels, Harald Garcke, Julia Wittmann. 2026-07-31. Local Well-Posedness for a Diffuse Interface Model for Two-Phase Flows from Mixture Theory. https://arxiv.org/abs/2607.29298

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