Stability of a fluid stirred between two impellers with blades in a cylindrical enclosure: Evidence for forcing-dependent turbulence states

Brice Saint-Michel (1) , Bérengère Dubrulle (1) , Florent Ravelet (2) , François Daviaud (1)

1 SPEC - UMR3680 - Service de physique de l'état condensé
2 DynFluid - Laboratoire de Dynamique des Fluides

We study the influence of the forcing on the steady turbulent states of a von Karman swirling a a flow, at constant impeller speed, or at constant torque. We find that the different forcing conditions change the nature of the stability of the steady states and reveal dynamical regimes that bear similarities with low-dimensional systems. We suggest that this forcing dependence may be an out- of-equilibrium analogue of the ensemble inequivalence, valid for long-range interacting statistical systems, and that it may be applicable to other turbulent systems.

Domaines: Dynamique des Fluides [physics.flu-dyn]

Brice Saint-Michel, Bérengère Dubrulle, Florent Ravelet, François Daviaud. Stability of a fluid stirred between two impellers with blades in a cylindrical enclosure: Evidence for forcing-dependent turbulence states. 2013. ⟨hal-00773512v1⟩