Abstract
Flow over a tandem cylinder configuration is investigated experimentally and numerically without and with flow control by plasma actuation at Reynolds number of 22,000. Very good agreement between LES and experimental results is obtained for the baseline flow without control in terms of wake velocity profiles, turbulence intensity, and frequency spectra of pressure fluctuations on the downstream cylinder. The effectiveness of DBD plasma actuators for reducing surface pressure fluctuations, and consequently flow-induced noise, is demonstrated. Through suppression of vortex shedding from the upstream cylinder, the levels of pressure fluctuations on the downstream cylinder are reduced by more than 10 dB. LES with a plasma model correctly predicts the overall control effect, although some discrepancies with experimental data exist due to uncertainties in the plasma model. I. Background and Motivation
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