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We execute a numerical simulation on active nematics with particlesinteracting by excluded volume effect. The system with rhomboidal particles andthat with elliptical particles are considered in order to investigate theeffect of the direct contact of particles. In our simulation, the void regions,where the local number density is almost zero, appear in both the systems whenaspect ratio of the particles is high. We focused on the relationship betweenthe void regions and the particle orientation of the bulk. The particle numberdensity, particle orientation, topological defects, and void regions areanalyzed for different aspect ratios in both the systems. The systems withrhomboidal particles have a characteristic void size, which increases with anincrease in the aspect ratio. In contrast, the distribution of the void-regionsize in the systems with elliptical particles is broad. The present resultssuggest that the void size in the system with rhomboidal particles isdetermined by the correlation length of the particle orientational field aroundthe void regions, while that in the system with elliptical particles might bedetermined by the system size.

Aspect-ratio-dependent void formation in active rhomboidal and elliptical particle systems