71th Annual Meeting of the APS Division of Fluid Dynamics (November 18, 2018 — November 20, 2018)

P0044: The Opposition to Turbulence

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Authors

• Christine Yu, California Institute of Technology
• Simon Toedtli, California Institute of Technology
• Beverley McKeon, California Institute of Technology

DOI: https://doi.org/10.1103/APS.DFD.2018.GFM.P0044

Data used to create these visualizations were generated by direct numerical simulations of turbulent channel flows under varying-phase opposition control, a form of feedback flow control that uses sensors to detect and suppress streamwise vortices through blowing and suction at the wall. From these visualizations, we can see that the flow under opposition control with actuation leading the sensor measurements in the streamwise direction have considerably fewer turbulent structures compared with controlled flows where the actuation lags.