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DY: Fachverband Dynamik und Statistische Physik

DY 32: Poster: Active Matter, Soft Matter, Fluids

DY 32.1: Poster

Mittwoch, 20. März 2024, 15:00–18:00, Poster C

Modelling electrokinetic two-phase flows applicable to porous media — •Alexander Reinauer and Christian Holm — Institute for Computational Physics, Stuttgart, Germany

The simulation of electrolytic multiphase flow is a highly complex task that requires to simulate a large number of explicit particles or to solve a highly coupled set of non-linear partial differential equations, namely the Navier-Stokes and the Nernst-Planck equations in a continuous picture. At the cost of the molecular details, the continuum scale description enables the investigation of larger-scale systems that are relevant for oil-recovery and biological systems. An application is the electrophoresis of liquid droplets, which displays various complex phenomena including phase separation and transport in biological systems. Several choices of solvers exist for the continuum scale description, our implementation is based on the color-gradient extension to the lattice Boltzmann method to simulate immiscible multiphase flow as well as a custom Nernst-Planck solver to describe the transport of dissolved charged chemical species. By developing a coupling between these two methods, we allow for the inclusion of preferential solubilities of the chemical species. For the implementation, the pystencils/lbmpy framework is used, providing a highly optimized code-generation tool for CPU and GPU that allows for rapid prototyping of stencil-code in Python. In order to assess our model, we conduct a simulation study of freely suspended liquid droplets under the application of an external electric field.

Keywords: lattice Boltzmann; electrokinetics; multiphase flow