Journal
2019 IEEE 58TH CONFERENCE ON DECISION AND CONTROL (CDC)
Volume -, Issue -, Pages 5918-5923Publisher
IEEE
Keywords
Drag reduction; sensor-free flow control; spatially-periodic systems; spatio-temporal frequency responses; stochastically-forced Navier-Stokes; turbulence modeling
Funding
- Office of Naval Research [N00014-17-1-2308]
- Air Force Office of Scientific Research [FA9550-16-1-0009, FA9550-18-1-0422]
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Carefully designed surface corrugation is a sensor-free strategy that can reduce skin-friction drag in turbulent flows. In contrast to the traditional approach that relies on numerical simulations and experiments, we develop a model-based framework to quantify the impact of spanwise-periodic surfaces on the dynamics of velocity fluctuations and the resulting mean flow. We model the effect of surface corrugation as a volume penalization on the Navier-Stokes equations and use the statistical response of the stochastically forced linearized equations to quantify the effect of background turbulence on skin-friction drag. For triangular corrugations, we demonstrate that our simulation-free approach reliably predicts drag-reducing trends observed in high-fidelity simulations and experiments.
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