Rare-event detection in a backward-facing-step flow using live optical-flow velocimetry: observation of an upstream jet burst

Abstract

Rare and extreme events in turbulent flows play a critical role in transport, mixing and transition, yet are notoriously difficult to capture experimentally. Here we report, to our knowledge, the first direct experimental detection of an upstream-directed jet burst in a backward-facing step (BFS) flow at $R{e}_h=2100$, using long-duration Live Optical Flow Velocimetry (L-OFV). Continuous monitoring over 1.5 h enabled a data-driven definition of extremes as rare velocity probes excursions deep into the observed distribution's tails; in practice, large negative events ($u:Z<-6$, $v:Z<-5$ at $(x,y)=(2h,h/2)$, where $|Z|>>0$ stands for large deviations from the mean value) triggered the live capture of surrounding velocity fields. The recording is triggered when the probes surpass the defined threshold, using live analysis of the velocity fields. The detected event features a jet-like intrusion into the recirculation region initiated by the collapse of a merged Kelvin-Helmholtz vortex and sustained by counter-rotating vortices, and is accompanied with heavy-tailed probe statistics and simultaneous amplification of fluctuating kinetic energy and enstrophy. While a single event was recorded, underscoring its rarity, the results establish L-OFV as a viable platform for rare-event detection in separated shear layers and document a previously unreported mechanism of upstream jet bursting in BFS flow.

References in corpus (11)

• Closed-loop separation control using machine learning
• Simulating rare events in dynamical processes
• Probing rare physical trajectories with Lyapunov weighted dynamics
• A rare event algorithm links transitions in turbulent flows with activated nucleations
• Experimental scaling law for the sub-critical transition to turbulence in plane Poiseuille flow
• Extreme events in transitional turbulence
• Control of the flow behind a backward-facing step by visual feedback
• The chaotic dynamics of large-scale structures in a turbulent wake
• Reactive control of the dynamics of a fully turbulent wake using real-time PIV
• Rare event-triggered transitions in aerodynamic bifurcation
• Numerical study of extreme mechanical force exerted by a turbulent flow on a bluff body by direct and rare-event sampling techniques