Effect of a flight stream on subsonic turbulent jets
This study concerns a turbulent jet at Mach number M j= 0.9, subject to a uniform external
flow stream at M f= 0.15. The analysis combines experimental and numerical databases …
flow stream at M f= 0.15. The analysis combines experimental and numerical databases …
The effect of flight on a turbulent jet: coherent structure eduction and resolvent analysis
We study coherent structures in subsonic turbulent jets subject to a flight stream. A thorough
characterisation of the effects of a flight stream on the turbulent field was recently performed …
characterisation of the effects of a flight stream on the turbulent field was recently performed …
Responses to disturbance of supersonic shear layer: Input-output analysis
We investigate the perturbation dynamics in a supersonic shear layer using a combination of
large-eddy simulations (LES) and linear-operator-based input-output analysis. The flow …
large-eddy simulations (LES) and linear-operator-based input-output analysis. The flow …
Eduction of acoustics-related coherent structures from Schlieren images of supersonic twin jets by coupling Doak's decomposition and SPOD
This work proposes a methodology to improve the extraction of coherent structures
associated with the generation of acoustic fluctuations in turbulent jets from high-speed …
associated with the generation of acoustic fluctuations in turbulent jets from high-speed …
Beyond optimal disturbances: a statistical framework for transient growth
The theory of transient growth describes how linear mechanisms can cause temporary
amplification of disturbances even when the linearized system is asymptotically stable as …
amplification of disturbances even when the linearized system is asymptotically stable as …
Eduction of coherent structures from schlieren images of twin jets using SPOD informed with momentum potential theory in the spectral domain
This work presents a methodology to extract coherent structures from high-speed schlieren
images of turbulent twin jets which are more physically interpretable than those obtained …
images of turbulent twin jets which are more physically interpretable than those obtained …
Identification of structures driving trailing-edge noise. Part I--Experimental investigation
Trailing-edge (TE) noise is the main contributor to the acoustic signature of flows over
airfoils. It originates from the interaction of turbulent structures in the airfoil boundary layer …
airfoils. It originates from the interaction of turbulent structures in the airfoil boundary layer …
Experimental Validation of PSE Wavepacket Models for Supersonic Twin Jets Using Schlieren Imaging and Potential-Momentum-Theory-Based SPOD
Wavepacket models are computed for perfectly-expanded twin jets by means of plane-
marching parabolized stability equations (PM-PSE) and compared against coherent …
marching parabolized stability equations (PM-PSE) and compared against coherent …
Acoustic resolvent analysis of turbulent jets
We perform a resolvent analysis of a compressible turbulent jet, where the optimisation
domain of the response modes is located in the acoustic field, excluding the hydrodynamic …
domain of the response modes is located in the acoustic field, excluding the hydrodynamic …
Localized resolvent-mode bases for turbulence statistics
Modes from global resolvent analyses have been shown to accurately model the
frequencies and spatial structure of the dominant coherent structures in several turbulent …
frequencies and spatial structure of the dominant coherent structures in several turbulent …