Modeling and Manipulation of Wall-Bounded Turbulent Flows :
From the Laboratory to High Reynolds Numbers

Beverley J. McKeon
Graduate Aerospace Laboratories
California Institute of Technology
U.S.A.

Questions remain about the structure of wall turbulence, its sensitivity to perturbation (most practically with regards to natural or synthetic modification of the wall boundary condition via degradation or for control or manipulation purposes) and methods to design global flow characteristics.  While the power of computation has grown dramatically in recent times, many of these issues are both unresolved and especially important at the Reynolds numbers of relevance to large scale, high Reynolds number naval, aeronautical and industrial flows. In this talk, we consider the canonical wall flows and utilize a combination of theory and (resolvent) analysis of the governing equations, simulation and experiments to give insight into some of the fundamental mechanisms governing flow response to wall modification and their relevance to high Reynolds number flow. The work has benefited from funding by ONR and AFOSR over a period of years, which is gratefully acknowledged.