Research

 
Primary research interests: Fluid dynamics ▪ experimental techniques ▪ environmental flows ▪ turbulent boundary layers ▪ real-time flow control ▪ micro-fluidics ▪ propulsion ▪ skin-friction drag reduction ▪ shock wave boundary layer interaction ▪ jet aeroacoustics ▪ nonlinear acoustics ▪ reduced-order modeling ▪ stochastic tools ▪ transient signal processing.
 


Data & Scripts


 

Wall-bounded turbulence

  • Wall-coherent structure and the kx-1 spectral signature of the streamwise velocity fluctuations in turbulent boundary layers (TBLs).
  • Direct measurements of local wall-drag in smooth- and rough-wall TBLs.
  • Large-scale modulation and large-scale arrangement of small scales in high Reynolds number TBLs.
  • Real-time, active control of large-scale structures in high Reynolds number TBLs.

 

Jet aeroacoustics

  • Aeroacoustic aspects of heated and unheated supersonic jets.
  • Nonlinear acoustic waveform distortion in noise fields of supersonic jets.
  • Crackle-noise emitted by supersonic jets.

 

Supersonic nozzle flows

  • Shock wave boundary layer interaction (SWBLI) in overexpanded, large area ratio nozzles.
  • Side-load unsteadiness of thrust-optimized/truncated-ideal-contoured nozzles.
  • Transient unsteadiness during start-up and shut-down.
  • Vibro-acoustic loads during start-up, representative of nozzle ignition.

 

Stochastic processing

  • Reduced-order models and system identification of complex data.
  • Stochastic estimation techniques.
  • Signal processing: spectral analysis and joint-time frequency distributions.