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Study of a Three Component Cahn-Hilliard Flow Model

Mathematical Modelling and Numerical Analysis, Volume : 40 n° 2 Pagination : 653-687 Jul 2006

Franck Boyer, Celine Lapuerta.

Document type > *Article de revue

Keywords > safety, Navier-Stokes equations, numerical methods

Research Unit > IRSN/DPAM/SEMIC

Authors > LAPUERTA Céline

Publication Date > 01/07/2006

Summary

In this paper, we propose a new diffuse interface model for the study of three immiscible component incompressible viscous ows. The model is based on the Cahn-Hilliard free energy approach.
The originality of our study lies in particular in the choice of the bulk free energy. We show that one must take care of this choice in order for the model to give physically relevant results. More precisely, we give conditions for the model to be well-posed and to satisfy algebraically and dynamically consistency properties with the two-component models. Notice that our model is also able to cope with some total
spreading situations.
We propose to take into account the hydrodynamics of the mixture by coupling our ternary Cahn- Hilliard system and the Navier-Stokes equation supplemented by capillary force terms accounting for surface tension effects between the components. Finally, we present some numerical results which illustrate our analysis and which confirm that our model has a better behavior than other possible similar models.

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