108 citations · 417 across the 11 of their papers we have counts for
11 papers
Jet-noise reduction via streak generation in the nozzle boundary layer
Filipe R. do Amaral, Petrônio A. S. Nogueira, Igor A. Maia +2
We study the hydrodynamic and acoustic fields of turbulent jets issuing from nozzles modified by the addition of cylindrical tabs on the inner surface, one diameter upstream of the…
On the preferred flapping motion of round twin jets
Daniel Rodriguez, Michael N. Stavropoulos, Petronio A. S. Nogueira +2
Linear stability theory (LST) is often used to model the large-scale flow structures in the turbulent mixing region and near pressure field of high-speed jets. For perfectly-expand…
Reduced-order Galerkin models of plane Couette flow
André V. G. Cavalieri, Petrônio A. S. Nogueira
Reduced-order models were derived for plane Couette flow using Galerkin projection, with orthonormal basis functions taken as the leading controllability modes of the linearised Na…
Wavepacket modulation in shock-containing jets
Petrônio A. S. Nogueira, Hamish W. A. Self, Aaron Towne +1
We propose a new approach to predict the modulation of wavepackets in shock-containing jets. With a modelled ideally expanded mean flow as input, an approximation of the shock-cell…
Closure mechanism of the A1 and A2 modes in jet screech
Petrônio A. S. Nogueira, Vincent Jaunet, Matteo Mancinelli +2
This paper explores the screech closure mechanism for different axisymmetric modes in shock-containing jets. While many of the discontinuities in tonal frequency exhibited by scree…
Absolute instability in shock-containing jets
Petrônio A. S. Nogueira, Peter Jordan, Vincent Jaunet +3
We present an analysis of the linear stability characteristics of shock-containing jets. The flow is linearised around a spatially periodic mean, which acts as a surrogate for a me…
Transition to chaos in a reduced-order model of a shear layer
André V. G. Cavalieri, Erico L. Rempel, Petrônio A. S. Nogueira
The present work studies the non-linear dynamics of a shear layer, driven by a body force and confined between parallel walls, a simplified setting to study transitional and turbul…
Waves in screeching jets
Daniel Edgington-Mitchell, Tianye Wang, Petronio Nogueira +5
The interaction between various wavelike structures in screeching jets is considered via both experimental measurements and linear stability theory. Velocity snapshots of screechin…
The colour of forcing statistics in resolvent analyses of turbulent channel flows
Pierluigi Morra, Petronio A. S. Nogueira, André V. G. Cavalieri +1
The cross-spectral density (CSD) of the non-linear forcing in resolvent analyses is here quantified for the first time for turbulent channel flows. Direct numerical simulations (DN…
Forcing statistics in resolvent analysis: application in minimal turbulent Couette flow
Petrônio A. S. Nogueira, Pierluigi Morra, Eduardo Martini +2
An analysis of the statistics of the non-linear terms in resolvent analysis is performed in this work for turbulent Couette flow at low Reynolds number. Data from a direct numerica…
Lift-up, Kelvin-Helmholtz and Orr mechanisms in turbulent jets
Ethan Pickering, Georgios Rigas, Petrônio A. S. Nogueira +3
Three amplification mechanisms present in turbulent jets, namely lift-up, Kelvin-Helmholtz, and Orr, are characterized via global resolvent analysis and spectral proper orthogonal…