Chirality, anisotropic viscosity and elastic anisotropy in three-dimensional active nematic turbulence

Nika Kralj (Avtor), Miha Ravnik (Avtor), Žiga Kos (Avtor)

Povzetek

Various active materials exhibit strong spatio-temporal variability of their orientational order known as active turbulence, characterised by irregular and chaotic motion of topological defects, including colloidal suspensions, biofilaments, and bacterial colonies.In particular in three dimensions, it has not yet been explored how active turbulence responds to changes in material parameters and chirality.Here, we present a numerical study of three-dimensional (3D) active nematic turbulence, examining the influence of main material constants: (i) the flow-alignment viscosity, (ii) the magnitude and anisotropy of elastic deformation modes (elastic constants), and (iii) the chirality. Specifically, this main parameter space covers contractile or extensile, flow-aligning or flow tumbling, chiral or achiral elastically anisotropic active nematic fluids. The results are presented using time- and space-averaged fields of defect density and mean square velocity. The results also discuss defect density and mean square velocity as possible effective order parameters in chiral active nematics, distinguishing two chiral nematic states—active nematic blue phase and chiral active turbulence. This research contributes to the understanding of active turbulence, providing a numerical main phase space parameter sweep to help guide future experimental design and use of active materials.

Ključne besede

tekoči kristali;aktivni nematiki;topološki defekti;aktivne tekočine;liquid crystals;active nematics;topological defects;active fluids;

Podatki

Jezik:	Angleški jezik
Leto izida:	2024
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UL FMF - Fakulteta za matematiko in fiziko
UDK:	538.9
COBISS:	202054403
ISSN:	2399-3650
Št. ogledov:	24
Št. prenosov:	0
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	tekoči kristali;aktivni nematiki;topološki defekti;aktivne tekočine;
Vrsta dela (COBISS):	Članek v reviji
Strani:	9 str.
Letnik:	ǂVol. ǂ7
Zvezek:	ǂart. no. ǂ222
Čas izdaje:	Jul. 2024
DOI:	10.1038/s42005-024-01720-8
ID:	24574117