Active nematics in corrugated channels

Abstract

Active nematic fluids exhibit complex dynamics in both bulk and in simple confining geometries. However, complex confining geometries could have substantial impact on active spontaneous flows. Using multiparticle collision dynamics simulations adapted for active nematic particles, we study the dynamic behaviour of an active nematic fluid confined in a corrugated channel. The transition from a quiescent state to a spontaneous flow state occurs from a weak swirling flow to a strong coherent flow due to the presence of curved-wall induced active flows. We show that active nematic fluid flows in corrugated channels can be understood in two different ways: (i) as the result of an early or delayed flow transition when compared with that in a flat-walled channel of appropriate width and (ii) boundary-induced active flows in the corrugations providing an effective slip velocity to the coherent flows in the bulk. Thus, our work illustrates the crucial role of corrugations of the confining boundary in dictating the flow transition and flow states of active fluids.

References in corpus (11)

• Spontaneous motion in hierarchically assembled active matter
• Meso-scale turbulence in living fluids
• Steady-state hydrodynamic instabilities of active liquid crystals: Hybrid lattice Boltzmann simulations
• Defect dynamics in active nematics
• Particle-Based Mesoscale Hydrodynamic Techniques
• Flow states and transitions of an active nematic in a three dimensional channel
• Spontaneous Self-Constraint in Active Nematic Flows
• Mesoscopic Simulations of Active-Nematics
• Rectified Rotational Dynamics of Mobile Inclusions in Two-Dimensional Active Nematics
• Motile topological defects hinder dynamical arrest in dense liquids of active ellipsoids
• Mitigating Density Fluctuations in Particle-based Active Nematic Simulations