Why nonuniform density suppresses the precessing vortex core

K Oberleithner, S Terhaar… - … for Gas Turbines …, 2013 - asmedigitalcollection.asme.org
Linear stability analysis is applied to a swirl-stabilized combustor flow with the aim to
understand how the flame shape and associated density field affects the manifestation of …

Flow control design inspired by linear stability analysis

S Camarri - Acta Mechanica, 2015 - Springer
In the recent literature, a growing number of research papers have been dedicated to
applying the techniques of global stability and sensitivity analysis to the design of flow …

Global stability of buoyant jets and plumes

RVK Chakravarthy, L Lesshafft… - Journal of Fluid …, 2018 - cambridge.org
The linear global stability of laminar buoyant jets and plumes is investigated under the low-
Mach-number approximation. For Richardson numbers in the range (plume) regimes. A …

The effect of streaks on the instability of jets

C Wang, L Lesshafft, AVG Cavalieri… - Journal of fluid …, 2021 - cambridge.org
The presence of elongated streaks of high and low streamwise velocity in the shear layer of
circular jets breaks the axisymmetry of their steady-state solution. If the streaks are …

Global instability of low-density jets

W Coenen, L Lesshafft, X Garnaud… - Journal of Fluid …, 2017 - cambridge.org
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 …

A geometrical criterion for absolute instability in separated boundary layers

MP Avanci, D Rodríguez, LSB Alves - Physics of Fluids, 2019 - pubs.aip.org
Laminar separation bubbles on airfoils and low-pressure turbines are generally expected to
be dominated by convective inflectional instability. However, absolute instability is possible …

Onset of global instability in low-density jets

Y Zhu, V Gupta, LKB Li - Journal of Fluid Mechanics, 2017 - cambridge.org
In low-density axisymmetric jets, the onset of global instability is known to depend on three
control parameters, namely the jet-to-ambient density ratio. This scaling, which is insensitive …

Diffusion-flame flickering as a hydrodynamic global mode

D Moreno-Boza, W Coenen, A Sevilla… - Journal of Fluid …, 2016 - cambridge.org
The present study employs a linear global stability analysis to investigate buoyancy-induced
flickering of axisymmetric laminar jet diffusion flames as a hydrodynamic global mode. The …

Linear stability analysis of a three-dimensional viscoelastic liquid jet surrounded by a swirling air stream

LJ Yang, MX Tong, QF Fu - Journal of Non-Newtonian fluid mechanics, 2013 - Elsevier
A theoretical model is established to investigate the instability of a viscoelastic liquid jet with
axisymmetric and non-axisymmetric disturbances, which is moving in a swirling air stream …

[HTML][HTML] Self-excited oscillations in variable density counter-current round jets

K Wawrzak, A Boguslawski - International Journal of Heat and Fluid Flow, 2023 - Elsevier
The paper investigates the global instability phenomenon in variable-density counter-current
round jets. The analysis is performed using a large eddy simulation and the computations …