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DY: Fachverband Dynamik und Statistische Physik

DY 34: Focus Session: Fluids with Broken Time-Reversal Symmetry – Odd/Hall Viscosity Between Active Matter and Electron Flows

DY 34.1: Invited Talk

Wednesday, March 11, 2026, 09:30–10:00, ZEU/0160

Active turbulence and odd viscosity in a colloidal chiral active system in bulk and in patterned environments — Joscha Mecke^1,2, Yongxiang Gao¹, and •Marisol Ripoll² — ¹Institute for Advanced Study, Shenzhen University, Shenzhen, China — ²Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich, Germany

Experiments for a chiral active fluid composed of a carpet of standing and spinning colloidal rods are compared with simulations for synchronously rotating hard discs in a hydrodynamic explicit solvent [1]. The emergence of multi-scale eddies, with features of self-similar dynamics, indicates the existence of active turbulence, while the particles accumulation in the centre of the vortices allows the quantification of the system odd viscosity. The existence of a non-negligible substrate friction can be shown to be responsible of the truncation of the energy spectra and the related reduction of the vortex size [2], and the interaction with fixed obstacles shows to originate a flow opposite to the rotation direction which induces a pinning vortex effect [3].

[1] J. Mecke, Y. Gao, C. Ramirez-Medina, D. Aarts, G. Gompper and M. Ripoll, Comm. Phys. 6 (2023), 324 [2] J. Mecke, Y. Gao, G. Gompper and M. Ripoll, Comm. Phys. 7 (2024), 332 [3] J. Mecke, Y. Gao and M. Ripoll, Phys. Fluids 37 (2025), 112016

Keywords: active matter; odd viscosity; active turbulence; chirality; hydrodynamics