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Robust real-time estimation of the state of the flow past a backward-facing step

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Real-time experimental estimation of the state of a separated flow is crucial in the perspective of closed-loop flow control. In this study a classic backward-facing step flow was investigated using real-time flow optics measurements. Different ways to translate large amounts of instantaneous 2D data into actionable local of global scalar quantities are examined. Alternative definitions for classically used quantities to qualify the state of the flow, such as the instantaneous or the mean recirculation bubble length, are introduced. Previous definitions using parietal informations can be expanded upon or modified to integrate two-dimensional and three-dimensional information. Advantages and drawbacks of the different definitions are discussed in the perspective of closed-loop experiments.

Author(s):

Nicolas Gautier    
PMMH
France

Jean-Luc Aider    
PMMH
France