Response of noise-amplifier flows: From linear control to nonlinear jet breakup
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The two-dimensional backward-facing step flow is a canonical example of noise amplifier flow: global linear stability analysis predicts that it is stable, but perturbations can undergo large amplification in space and time as a result of non-normal effects ...
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Institute of Electrical and Electronics Engineers2014
Sensitivity analysis is used to design an open-loop control for separated flows. The length of the recirculation region lc is expressed as a cost functional, and its sensitivity to actuation is derived analytically. This analysis allows to identify regi ...
Linear optimal gains are computed for the subcritical two-dimensional separated boundary-layer flow past a bump. Very large optimal gain values are found, making it possible for small-amplitude noise to be strongly amplified and to destabilize the flow. Th ...
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