Research
The McKeon research group researches fundamental and applied problems related to fluid flow, especially close to surfaces. The focus is on challenges related to aerospace, hydrodynamics, the fluid dynamics of bioinspired design, and engineering in general, using novel experiments and analysis techniques.
We have current research activity related to characterizing the fundamental structure of turbulent boundary layers; to efficient and highfidelity loworder models of wall turbulence, especially by extending the resolvent analysis for turbulent flows which we have been developing for several years; and to flow modeling exploiting both computational and experimental data through data assimilation frameworks.
Current Research Highlights

Familiar Patterns in Strongly Viscoelastic TurbulenceWe use linear stability techniques and resolvent analysis to give insight into the structure of turbulent flow of a polymerdoped fluid. 

Structural Analysis of Turbulent Boundary LayersWe leverage integral measurements of a passive scalar to identify structurally important velocity scales in boundary layers. 

Resolvent Analysis: Compressibility Effects, Scalar Dynamics, and Analytic ApproximationsExtensions of the resolvent framework for a wider variety of applications in wallbounded turbulence 

A Take on Turbulence: Singing into ChaosLeveraging the idea of coherent structures in turbulent flows, we seek to study the response of this complex system to a known synthetic structure. 

Systematic Design of Feedback Flow Control for Turbulent Drag ReductionTaming turbulence: we develop systematic approaches to design flow control schemes to reduce drag on the next generation of ships, airplanes and other engineering systems. 

Influence of Mechanical System Design on the Response of an Airfoil to Predicted, Coherent Fluid ForcingHow should we design an engineering system to leverage a predicted incoming flow field for improved drag reduction? 

Study of Unsteady Flow Phenomena via CyberPhysical Fluid DynamicsCombining cyberphysical fluid dynamics and Koopman analysis in order to study forced fluidstructure systems. 

Reduced Order Modeling of Rotationally Driven FlowsIt seems doubtful whether we can expect to understand fully the instability of a fluid flow without obtaining a mathematical representation of the motion of the fluid in some particular case in which instability can actually be observed. – G. I. Taylor (1923) 

A Resolventbased Model for Roughnessinduced Scale Interactions in a Turbulent Boundary LayerBy modeling a turbulent boundary layer as a loworder linear system with random background forcing, we are able to qualitatively predict the effect of a rough wall on the individual scales of the turbulence. 

TollmienSchlichting waves and the ElastoInertial InstabilityTransition in the flow of highly viscoelastic fluids has its origins in a classical Newtonian flow pattern 