Uncovering novel phase transitions in dense dry polar active fluids using a lattice Boltzmann method

The dynamics of dry active matter have implications for a diverse collection biological phenomena spanning range length and time scales, such as animal flocking, cell tissue dynamics, swarming inserts bacteria. Uniting these systems are common set symmetries conservation laws, defining fluids class physical system. Many interesting behaviours been observed at high densities, which remain difficult to simulate due the computational demand. Here, we show how two-dimensional in dense regime can be studied using simple modification lattice Boltzmann method. We apply our method on model that exhibits motility-induced phase separation, an with contact inhibition locomotion, has relevance collective migration. For latter, uncover multiple novel transitions: two first-order one potentially critical. further support simulation results analytical treatment hydrodynamic equations obtained via Chapman–Enskog coarse-graining procedure.