[1807.01211] Clustering of microswimmers: Interplay of shape and hydrodynamics We gratefully acknowledge support from the Simons Foundation and member institutions. > cond-mat > arXiv:1807.01211 All papers Titles Authors Abstracts Full text (Help | Advanced search) Full-text links: Download: PDF Other formats Current browse context: cond-mat.soft < prev | next > new | recent | 1807 Change to browse by: cond-mat References & Citations NASA ADS Bookmark (what is this?) Condensed Matter > Soft Condensed Matter Title: Clustering of microswimmers: Interplay of shape and hydrodynamics Authors: Mario Theers, Elmar Westphal, Kai Qi, Roland G. Winkler, Gerhard Gompper (Submitted on 3 Jul 2018) Abstract: The spatiotemporal dynamics in systems of active self-propelled particles is controlled by the propulsion mechanism in combination with various direct interactions, such as steric repulsion, hydrodynamics, and chemical fields. Yet, these direct interactions are typically anisotropic, and come in different 'flavors', such as spherical and elongated particle shapes for steric repulsion, pusher and puller flow fields for hydrodynamics, etc. The combination of the various aspects is expected to lead to new emergent behavior. However, it is a priori not evident whether shape and hydrodynamics act synergistically or antagonistically to generate motility-induced clustering (MIC) and phase separation (MIPS). We employ a model of prolate spheroidal microswimmers - called squirmers - in quasi-two-dimensional confinement to address this issue by mesoscale hydrodynamic simulations. For comparison, non-hydrodynamic active Brownian particles (ABPs) are considered to elucidate the contribution of hydrodynamic interactions on MIC and MIPS. For spherical particles, the comparison between ABP and hydrodynamic-squirmer ensembles reveals a suppression of MIPS due to hydrodynamic interactions. The fundamental difference between ABPs and squirmers is attributed to an increased reorientation of squirmers by hydrodynamic torques during their collisions. In contrast, for elongated squirmers, hydrodynamics interactions enhance MIPS. Thus, hydrodynamic interactions show opposing effects on MIPS for spherical and elongated microswimmers. Subjects: Soft Condensed Matter (cond-mat.soft) Cite as: arXiv:1807.01211 [cond-mat.soft] (or arXiv:1807.01211v1 [cond-mat.soft] for this version) Submission history From: Roland G. Winkler [view email] [v1] Tue, 3 Jul 2018 14:41:11 GMT (1242kb,D) Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?) Link back to: arXiv, form interface, contact. About Help contact arXivClick here to contact arXiv Contact subscribe to arXiv mailingsClick here to subscribe Subscribe Copyright Privacy Policy Web Accessibility Assistance arXiv Operational Status Get status notifications via email or slack
