Emergent collective dynamics of pusher and puller squirmer rods: swarming, clustering, and turbulence
| dc.contributor.author | Zantop, Arne W. | |
| dc.contributor.author | Stark, Holger | |
| dc.date.accessioned | 2022-10-31T08:23:20Z | |
| dc.date.available | 2022-10-31T08:23:20Z | |
| dc.date.issued | 2022-07-05 | |
| dc.description.abstract | We study the interplay of steric and hydrodynamic interactions in suspensions of elongated microswimmers by simulating the full hydrodynamics of squirmer rods in the quasi two-dimensional geometry of a Hele-Shaw cell. To create pusher or puller-type squirmer rods, we concentrate the surface slip-velocity field more to the back or to the front of the rod and thereby are able to tune the rod's force-dipole strength. We study a wide range of aspect ratios and area fractions and provide corresponding state diagrams. The flow field of pusher-type squirmer rods destabilizes ordered structures and favors the disordered state at small area fractions and aspect ratios. Only when steric interactions become relevant, we observe a turbulent and dynamic cluster state, while for large aspect ratios a single swarm and jammed cluster occurs. The power spectrum of the turbulent state shows two distinct energy cascades at small and large wave numbers with power-law scaling and non-universal exponents. Pullers show a strong tendency to form swarms instead of the disordered state found for neutral and pusher rods. At large area fractions a dynamic cluster is observed and at larger aspect ratio a single swarm or jammed cluster occurs. | en |
| dc.description.sponsorship | DFG, 163436311, SFB 910: Kontrolle selbstorganisierender nichtlinearer Systeme: Theoretische Methoden und Anwendungskonzepte | |
| dc.description.sponsorship | TU Berlin, Open-Access-Mittel – 2022 | de |
| dc.identifier.eissn | 1744-6848 | |
| dc.identifier.issn | 1744-683X | |
| dc.identifier.uri | https://depositonce.tu-berlin.de/handle/11303/17600 | |
| dc.identifier.uri | https://doi.org/10.14279/depositonce-16383 | |
| dc.language.iso | en | |
| dc.relation.ispartof | 10.14279/depositonce-16766 | |
| dc.rights.uri | https://creativecommons.org/licenses/by/3.0/ | |
| dc.subject.ddc | 530 Physik | de |
| dc.subject.other | squirmer rods | en |
| dc.subject.other | clustering | en |
| dc.subject.other | hydrodynamics | en |
| dc.subject.other | microswimmers | en |
| dc.subject.other | Hele-Shaw cell | en |
| dc.title | Emergent collective dynamics of pusher and puller squirmer rods: swarming, clustering, and turbulence | en |
| dc.type | Article | |
| dc.type.version | publishedVersion | |
| dcterms.bibliographicCitation.doi | 10.1039/D2SM00449F | |
| dcterms.bibliographicCitation.issue | 33 | |
| dcterms.bibliographicCitation.journaltitle | Soft Matter | |
| dcterms.bibliographicCitation.originalpublishername | Royal Society of Chemistry | |
| dcterms.bibliographicCitation.originalpublisherplace | London | |
| dcterms.bibliographicCitation.pageend | 6191 | |
| dcterms.bibliographicCitation.pagestart | 6179 | |
| dcterms.bibliographicCitation.volume | 18 | |
| tub.accessrights.dnb | free | |
| tub.affiliation | Fak. 2 Mathematik und Naturwissenschaften::Inst. Theoretische Physik::FG Statistische Physik weicher Materie und biologischer Systeme | |
| tub.publisher.universityorinstitution | Technische Universität Berlin |