BPCPPDYSOE21 – scientific programme
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BP: Fachverband Biologische Physik
BP 5: Active Biological Matter II (joint session BP/CPP/DY)
BP 5.3: Talk
Monday, March 22, 2021, 11:40–12:00, BPb
Thin-Film Model of Resting and Moving Active Droplets — •Fenna Stegemerten1, Sarah Trinscheck1,2, Karin John2, and Uwe Thiele1,3 — 1Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster, Münster, Germany — 2Université Grenoble-Alpes, CNRS Laboratoire Interdisciplinaire de Physique, Grenoble, France — 3Center for Nonlinear Science (CeNoS), Westfälische Wilhelms-Universität Münster, Münster, Germany
We propose a long-wave model for free-surface drops of polar active liquid on a solid substrate. The coupled evolution equations for the film height and the local polarization profile are written in the form of a gradient dynamics supplemented with active stresses and fluxes. A wetting energy for a partially wetting liquid is incorporated allowing for motion of the liquid-solid-gas contact line. This gives a consistent basis for the description of drops of dense bacterial suspensions or compact aggregates of living cells on solid substrates. As example, we analyze the dynamics of active drops and demonstrate how active forces compete with passive surface forces to shape droplets and drive contact line motion. We perform parameter continuation in the activity parameters discussing both, resting and moving droplets. Additional direct time simulations investigate transitions from non-uniformly to uniformly polarized as well as resting to moving states.