Organized structures in turbulent jets can be modeled as wavepackets. These are
characterized by spatial amplification and decay, both of which are related to stability …

The directivity of noise from three large-eddy simulations of turbulent jets at Mach 0.7, 0.9,
and 1.5 is investigated using spectral proper orthogonal decomposition (SPOD). The most …

Resolvent analysis identifies the most responsive forcings and most receptive states of a
dynamical system, in an input–output sense, based on its governing equations. Interest in …

Response modes computed via linear resolvent analysis of a turbulent mean-flow field have
been shown to qualitatively capture characteristics of the observed turbulent coherent …

Three amplification mechanisms present in turbulent jets, namely lift-up, Kelvin–Helmholtz
and Orr, are characterized via global resolvent analysis and spectral proper orthogonal …

Direct numerical simulations, performed with a high-order spectral-element method, are
used to study coherent structures in turbulent pipe flow at friction Reynolds numbers. The …

The turbulent external flow around a three-dimensional stepped cylinder is studied by
means of direct numerical simulations with the adaptive mesh refinement technique. We …

In resolvent analyses of turbulent channel flows it has been common practice to neglect or
model the nonlinear forcing term that forms the input of the resolvent. However, the …

We extend the resolvent-based estimation approach recently introduced by Towne etal.(J.
Fluid Mech., vol. 883, 2020, A17) to obtain optimal, non-causal estimates of time-varying …

Streaks have been found to be an important part of wall-turbulence dynamics. In this paper,
we extend the analysis for unbounded shear flows, in particular a Mach 0.4 round jet, using …