4 papers
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…
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…