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DY: Fachverband Dynamik und Statistische Physik

DY 30: Active Matter III (joint session DY/BP/CPP)

DY 30.1: Vortrag

Dienstag, 17. März 2020, 14:00–14:15, ZEU 160

Uncovering novel phase transitions in dense dry polar active fluids using a lattice Boltzmann method — David Nesbitt, Gunnar Pruessner, and •Chiu Fan Lee — Imperial College, London, U.K.

The dynamics of dry active matter have implications for a diverse collection of biological phenomena spanning a range of length and time scales, such as animal flocking, cell tissue dynamics, and swarming of inserts and bacteria. Uniting these systems are a common set of symmetries and conservation laws, defining dry active fluids as a class of physical system. Many interesting behaviors have been observed at high densities, which remain difficult to simulate due to the computational demand. Here, we devise a new method to study dry active fluids in a dense regime using a simple modification of the lattice Boltzmann method. We apply our method to an active model with contact inhibition of locomotion, which has relevance to collective cell migration, and uncover multiple novel phase transitions: two first-order and one potentially critical. We further support our simulation results with an analytical treatment of the hydrodynamic equations.

Reference: D Nesbitt, G Pruessner, and CF Lee. Preprint: arXiv:1902.00530.