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Published June 2018 | public
Journal Article

Dynamic Roughness for Manipulation and Control of Turbulent Boundary Layers: An Overview


The use of dynamic roughness or small, oscillating, wall roughness elements to manipulate the structure of turbulent boundary layers is reviewed with a view to imposing true active control techniques. Linear and nonlinear responses to simple oscillations are detailed, such that the modifications of the overall structure of the turbulence and interactions between scales can be inferred. Although the work considered here uses mechanical actuation, the approach is considered sufficiently general to be implemented by a range of techniques, including engineered microelectromechanical system devices and metamaterial actuators.

Additional Information

© 2018 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Received 28 September 2017; revision received 5 January 2018; accepted for publication 15 January 2018; published online 5 March 2018. The authors gratefully acknowledge the support of the U.S. Air Force Office of Scientific Research (AFOSR) for the dynamic roughness work at the California Institute of Technology through AFOSR grant numbers FA9550-08-1-0049, FA9550-09-1-0701, FA9550-12-1-0469, and FA9550-16-1-0361. Subrahmanyam Duvvuri is grateful for the past support of a graduate fellowship from the Resnick Institute at the California Institute of Technology.

Additional details

August 19, 2023
October 18, 2023