Regensburg 2025 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Poster: Active Matter, Soft Matter, Fluids (joint session DY/CPP)

CPP 25.17: Poster

Wednesday, March 19, 2025, 10:00–12:00, P3

A lattice Boltzmann approach to electrolytic multiphase flows — •Alexander Reinauer and Christian Holm — Institute for Computational Physics, Stuttgart, Germany

Simulating electrolytic multiphase flow presents significant challenges, often requiring either the detailed modeling of large numbers of particles or solving complex, nonlinear partial differential equations, such as the Navier-Stokes and Nernst-Planck equations. While particle-based simulations provide molecular details, continuum-scale approaches, including the Navier-Stokes and Nernst-Planck equations, enable the study of larger systems relevant to applications in oil recovery, biological processes, and waste treatment.

In this work, we extend the Lattice Boltzmann Method using a Color-Gradient approach to simulate immiscible two-phase flow, coupled with a custom Nernst-Planck solver for the transport of dissolved charged species. This coupling allows to incorporate the preferential solubilities of chemical species.

Our implementation, based on the pystencils/lbmpy framework, generates highly optimized code for both CPU and GPU architectures. To validate the model, we performed simulations of freely suspended liquid droplets subjected to an external electric field. Additionally, we explored contact angle models and initiated studies on applying the approach to porous media under varying conditions.

Keywords: lattice Boltzmann; multiphase flow; electrokinetics; porous media