118 citations · 254 across the 12 of their papers we have counts for
12 papers
Jet-edge interaction: linear and non-linear frequency-selection mechanisms
Michael N. Stavropoulos, André V. G. Cavalieri, Lutz Lesshafft +1
We consider a round turbulent jet grazing a rectangular plate angled at . Through sound pressure measurements, the tonal dynamics associated with jet-edge interaction are…
Onset of global instability in a premixed annular V-flame
Chuhan Wang, Christopher M. Douglas, Yu Guan +2
We investigate self-excited axisymmetric oscillations of a lean premixed methane--air V-flame in a laminar annular jet. The flame is anchored near the rim of the centrebody, formin…
Acoustic resolvent analysis of turbulent jets
B. Bugeat, U. Karban, A. Agarwal +2
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 re…
An empirical model of noise sources in subsonic jets
Ugur Karban, Benjamin Bugeat, Aaron Towne +3
Modelling the noise emitted by turbulent jets is made difficult by their acoustic inefficiency: only a tiny fraction of the near-field turbulent kinetic energy is propagated to the…
The effect of a flight stream on subsonic turbulent jets
Igor A. Maia, Guillaume Brès, Lutz Lesshafft +1
This study concerns a turbulent jet at Mach number , subject to a uniform external flow stream at . We assess the mechanisms that underpin the reduction in fluct…
Global linear stability analysis of a flame anchored to a cylinder
Chuhan Wang, Lutz Lesshafft, Kilian Oberleithner
This study investigates the linear stability of a laminar premixed flame, anchored on a square cylinder and confined inside a channel. Many modern linear analysis concepts have bee…
Self-similar mechanisms in wall turbulence studied using of resolvent analysis
U. Karban, E. Martini, A. V. G. Cavalieri +2
Self-similarity of wall-attached coherent structures in a turbulent channel at is explored by means of resolvent analysis. In this modelling framework, coherent structur…
Accurate Frequency Domain Identification of ODEs with Arbitrary Signals
Eduardo Martini, André V. G. Cavalieri, Peter Jordan +1
The difficulty in frequency domain identification is that frequency components of arbitrary inputs and outputs are not related by the system's transfer function if signals are wind…
Resolvent-based modelling of coherent wavepackets in a turbulent jet
Lutz Lesshafft, Onofrio Semeraro, Vincent Jaunet +2
Coherent turbulent wave-packet structures in a jet at Reynolds number 460000 and Mach number 0.4 are extracted from experimental measurements and are modeled as linear fluctuations…
Global instability of low-density jets
W. Coenen, L. Lesshafft, X. Garnaud +1
The global stability of laminar axisymmetric low-density jets is investigated in the low Mach number approximation. The linear modal dynamics is found to be characterised by two fe…
Artificial eigenmodes in truncated flow domains
Lutz Lesshafft
Whenever linear eigenmodes of open flows are computed on a numerical domain that is truncated in the streamwise direction, artificial boundary conditions may give rise to spurious…
Identifying the active flow regions that drive linear and nonlinear instabilities
Olivier Marquet, Lutz Lesshafft
A new framework for the analysis of unstable oscillator flows is explored. In linear settings, temporally growing perturbations in a non-parallel flow represent unstable eigenmodes…