Details

Autor(en) / Beteiligte

• Crowley, Christopher J.
• Krygier, Michael C.
• Borrero-Echeverry, Daniel
• Grigoriev, Roman O.
• Schatz, Michael F.

Titel

A novel subcritical transition to turbulence in Taylor–Couette flow with counter-rotating cylinders

Ist Teil von

• Journal of fluid mechanics, 2020-06, Vol.892, Article A12

Ort / Verlag

Cambridge: Cambridge University Press

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The transition to turbulence in Taylor–Couette flow often occurs via a sequence of supercritical bifurcations to progressively more complex, yet stable, flows. We describe a subcritical laminar–turbulent transition in the counter-rotating regime mediated by a transient intermediate state in a system with an axial aspect ratio of $\unicode[STIX]{x1D6E4}=5.26$ and a radius ratio of $\unicode[STIX]{x1D702}=0.905$ . In this regime, flow visualization experiments and numerical simulations indicate the intermediate state corresponds to an aperiodic flow featuring interpenetrating spirals. Furthermore, the reverse transition out of turbulence leads first to the same intermediate state, which is now stable, before returning to an azimuthally symmetric laminar flow. Time-resolved tomographic particle image velocimetry is used to characterize the experimental flows; these measurements compare favourably to direct numerical simulations with axial boundary conditions matching those of the experiments.