Stochastic modelling of a noise-driven global instability in a turbulent swirling jet

M Sieber, CO Paschereit… - Journal of Fluid …, 2021 - cambridge.org
A method is developed to estimate the properties of a global hydrodynamic instability in
turbulent flows from measurement data of the limit-cycle oscillations. For this purpose, the …

Three-dimensional coherent structures in a swirling jet undergoing vortex breakdown: stability analysis and empirical mode construction

K Oberleithner, M Sieber, CN Nayeri… - Journal of fluid …, 2011 - cambridge.org
The spatio-temporal evolution of a turbulent swirling jet undergoing vortex breakdown has
been investigated. Experiments suggest the existence of a self-excited global mode having …

On the impact of swirl on the growth of coherent structures

K Oberleithner, CO Paschereit… - Journal of Fluid …, 2014 - cambridge.org
Spatial linear stability analysis is applied to the mean flow of a turbulent swirling jet at swirl
intensities below the onset of vortex breakdown. The aim of this work is to predict the …

[PDF][PDF] On turbulent swirling jets: Vortex breakdown, coherent structures, and their control

K Oberleithner - 2012 - depositonce.tu-berlin.de
This thesis provides an experimental and theoretical investigation of turbulent swirling jets
with the emphasis on the formation of large-scale coherent flow structures. The involved …

Transient evolution of the global mode in turbulent swirling jets: Experiments and modal stability analysis

L Rukes, M Sieber, CO Paschereit… - European Journal of …, 2017 - Elsevier
Swirling jets undergoing vortex breakdown are dominated by a strong coherent structure
that is characterized by a precessing vortex core and the large-scale roll-up of the shear …

An assessment of turbulence models for linear hydrodynamic stability analysis of strongly swirling jets

L Rukes, CO Paschereit, K Oberleithner - European Journal of Mechanics-B …, 2016 - Elsevier
Linear stability analysis has proven to be a useful tool in the analysis of dominant coherent
structures, such as the von Kármán vortex street and the global spiral mode associated with …

Spatiotemporal characterization of a conical swirler flow field under strong forcing

A Lacarelle, T Faustmann, D Greenblatt… - 2009 - asmedigitalcollection.asme.org
In this study, a spatiotemporal characterization of forced and unforced flows of a conical
swirler is performed based on particle image velocimetry (PIV) and laser Doppler …

Experiments on the instabilities of a swirling jet

J Panda, DK McLaughlin - Physics of Fluids, 1994 - pubs.aip.org
Instabilities present in a swirling jet in the Reynolds number range from 20 000 to 60 000
and a nominal swirl number of 0.5 were studied experimentally, using smoke visualization …

Forced flow response analysis of a turbulent swirling annular jet flame

CM Douglas, BL Emerson, S Hemchandra… - Physics of …, 2021 - pubs.aip.org
This study of an externally forced, amplifier-type turbulent reacting swirling annular jet
presents a low-order model for the flow response to transverse acoustic excitation and …

Study of jet precession, recirculation and vortex breakdown in turbulent swirling jets using LES

KKJR Dinesh, MP Kirkpatrick - Computers & Fluids, 2009 - Elsevier
Large eddy simulations (LES) are used to investigate turbulent isothermal swirling flows with
a strong emphasis on vortex breakdown, recirculation and instability behaviour. The Sydney …