Forcing-type-dependent stability of steady states in a turbulent swirling flow

Brice Saint-Michel (1) , Bérengère Dubrulle (1) , Louis Marié (2) , Florent Ravelet (3) , François Daviaud (1)

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

We study the influence of the forcing on the steady turbulent states of a von Karman swirling 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 analogue of the ensemble inequivalence observed in 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, Louis Marié, Florent Ravelet, François Daviaud. Forcing-type-dependent stability of steady states in a turbulent swirling flow. 2013. ⟨hal-00773512v2⟩