Dresden 2026 – wissenschaftliches Programm

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SYBS: Symposium Fluids with Broken Time-Reversal Symmetry: Odd/Hall Viscosity between Active Matter and Electron Flows

SYBS 1: Fluids with broken time-reversal symmetry: Odd/Hall viscosity between active matter and electron flows

SYBS 1.1: Hauptvortrag

Dienstag, 10. März 2026, 09:30–10:00, HSZ/AUDI

Odd viscosity in three-dimensional fluids: flows, wakes, and eddies — •Tali Khain — Harvard University, Cambridge, MA, USA

Systems composed of spinning particles or driven by a magnetic field break mirror symmetry at the microscopic level. These chiral fluids can be described by adding so-called ``odd" viscosities, which do not dissipate energy, in the Navier-Stokes equations. In this talk, I will discuss a theoretical fluid mechanics framework to describe the consequences of these broken symmetries on fluid flow [1]. Using a combination of analytical and numerical methods, we show how these odd viscosity coefficients modify flow across a range of Reynolds numbers. In the low Reynolds number limit, sedimenting objects in a chiral fluid generate a rotating flow that is absent in usual fluids; in turn, this flow affects how immersed objects respond to forces and torques [2]. At intermediate Reynolds numbers, odd viscosity reshapes the vortex structure of the wake of a sphere, which affects the onset and nature of the periodic vortex shedding state. At high Reynolds numbers, the non-dissipative nature of odd viscosity disrupts the energy cascade that occurs in fully developed turbulent flows, leading to pattern formation with a tunable scale [3].

[1] Khain, Scheibner, Fruchart, Vitelli, JFM (2022)

[2] Khain, Fruchart, Scheibner, Witten, Vitelli, JFM (2024)

[3] de Wit, Fruchart, Khain, Toschi, Vitelli, Nature (2024)

Keywords: odd viscosity; chiral fluid