The influence of frequency-limited and noise-contaminated sensing on reactive turbulence control schemes

The opposition control proposed by Choi et al. [1] is investigated using direct numerical simulation to see how bandwidth-limited and noise-contaminated sensing influence its control performance. It is found that the sensing frequency can be reduced substantially when the control scheme is modified to account for the convection speed of the measured sensor signal. Noisy sensor signals are shown to strongly affect the achievable net energy saving rate and energy gain at high sensing frequencies, while their influence is weaker for reduced sensing frequencies. These results also hold for increased Reynolds number, where the performance of the control scheme is generally lower.