Regensburg 2022 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 5: Wetting, Droplets and Microfluidics (joint session DY/CPP)
CPP 5.1: Talk
Monday, September 5, 2022, 10:00–10:15, H19
Lattice Boltzmann simulations of dense suspensions of soft particles with interface viscosity — •Fabio Guglietta1, Othmane Aouane1, Francesca Pelusi1, Marcello Sega1, and Jens Harting1,2 — 1Helmholtz Institute Erlangen-Nürnberg, Germany — 2Department of Chemical and Biological Engineering and Depart- ment of Physics, FAU Erlangen-Nüremberg, Germany
Interface viscosity (IV) plays a major role in the dynamics of single droplets and viscoelastic capsules by influencing their transient dynamics and steady-state deformation. For example, it has recently become clear that numerical models for red blood cells must include IV to account for their realistic description. Therefore, IV can be expected to play a significant role in determining also the dynamics and rheology of their dense suspensions. However, as no detailed investigation exists on the effects of IV in the dense suspensions of soft capsules, we aim to fill this gap by including it in computational fluid dynamics models. Here, we address this problem for the first time by performing numerical simulations in the framework of the immersed boundary - lattice Boltzmann method. This approach proved to be a valid numerical tool to provide a realistic description of soft particles immersed in Newtonian fluids. We employ a recent numerical model to account for IV by relying on the discretised Boussinesq-Scriven tensor, which provides a continuum description of a 2D viscous fluid. We show that the IV influences (a) the time it takes for particles to deform during the transient phase and (b) the final shape of the particles in the steady-state at different volume fraction values.