Stabilization of a multi-frequency open cavity flow with gradient-enriched machine learning control
GYC Maceda, E Varon, F Lusseyran… - Journal of Fluid …, 2023 - cambridge.org
We stabilize an open cavity flow experiment to 1% of its original fluctuation level. For the first
time, a multi-modal feedback control is automatically learned for this configuration. The key …
time, a multi-modal feedback control is automatically learned for this configuration. The key …
Global instability and mode selection in flow fields around rectangular prisms
Large-eddy simulations of the unsteady flows around rectangular prisms with chord-to-depth
ratios (B/D) ranging from 3 to 12 are carried out at a Reynolds number of 1000. A particular …
ratios (B/D) ranging from 3 to 12 are carried out at a Reynolds number of 1000. A particular …
Space-time aspects of a three-dimensional multi-modulated open cavity flow
J Basley, LR Pastur, N Delprat, F Lusseyran - Physics of Fluids, 2013 - pubs.aip.org
Side-band frequencies in an incompressible flow past a rectangular cavity are characterized
through their space-time coherent structures. A parametric study over a range of …
through their space-time coherent structures. A parametric study over a range of …
A statistical learning strategy for closed-loop control of fluid flows
F Guéniat, L Mathelin, MY Hussaini - Theoretical and Computational Fluid …, 2016 - Springer
This work discusses a closed-loop control strategy for complex systems utilizing scarce and
streaming data. A discrete embedding space is first built using hash functions applied to the …
streaming data. A discrete embedding space is first built using hash functions applied to the …
On the modulating effect of three-dimensional instabilities in open cavity flows
Open cavity flows are known to select and enhance locked-on modes or tones. High-energy
self-sustained oscillations arise within the shear layer, impinging onto the trailing edge of the …
self-sustained oscillations arise within the shear layer, impinging onto the trailing edge of the …
Nonlinear dynamics and hydrodynamic feedback in two-dimensional double cavity flow
F Tuerke, L Pastur, Y Fraigneau… - Journal of Fluid …, 2017 - cambridge.org
This paper reports results obtained with two-dimensional numerical simulations of viscous
incompressible flow in a symmetric channel with a sudden expansion and contraction …
incompressible flow in a symmetric channel with a sudden expansion and contraction …
Frequency-selection mechanism in incompressible open-cavity flows via reflected instability waves
We present an alternative perspective on nonharmonic mode coexistence, commonly found
in the shear layer spectrum of open-cavity flows. Modes obtained by a local linear stability …
in the shear layer spectrum of open-cavity flows. Modes obtained by a local linear stability …
Experimental study of double-cavity flow
The flow through two facing, identical cavities (double-cavity) is characterized
experimentally, as the inflow velocity and the distance between the cavities is varied …
experimentally, as the inflow velocity and the distance between the cavities is varied …
Suppression of self-sustained oscillations of incompressible flow over aperture-cavities and its mechanisms
W Zhang, R Xu, L He, J Duan - Journal of Hydrodynamics, 2022 - Springer
Experiments and large-eddy simulations (LESs) are conducted to study the effectiveness
and the underlying physical mechanisms of a passive control technique for suppressing the …
and the underlying physical mechanisms of a passive control technique for suppressing the …
Nonlinear delayed feedback model for incompressible open cavity flow
The dynamics of an oscillating shear layer when confined is enriched by retarded actions
whose physical modeling is not trivial. We present a nonlinear delayed saturation feedback …
whose physical modeling is not trivial. We present a nonlinear delayed saturation feedback …