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Title: Modelling under-expanded jet screech by ILES
Authors: Mancini, Alessandro
Di Stefano, Danilo
Hall, Edward
Rona, Aldo
First Published: 25-Jul-2014
Presented at: 6th European Conference on Computational Fluid Dynamics (ECFD VI), Barcelona, Spain
Start Date: 20-Jul-2014
End Date: 25-Jul-2014
Citation: 6th European Conference on Computational Fluid Dynamics (ECFD VI)
Abstract: Axisymmetric screech from an under-expanded contoured sonic nozzle is modelled by Implicit Large Eddy Simulations (ILES). A self-sustained shear-layer instability develops naturally, without artificial excitation, in the time-marching ILES simulation. This reproduces some of the main flow characteristics of the A2 axisymmetric screech mode documented in experiment. This includes a tonal pressure field, which is resolved by the model. The axisymmetric modelling approach prevents the development of azimuthal structures in the jet shear-layer downstream of the potential core, which are known to be important features for controlling jet mixing and broad-band jet noise.
Version: Post-print
Status: Peer-reviewed
Type: Conference Paper
Rights: Copyright © The Authors, 2014
Appears in Collections:Conference Papers & Presentations, Dept. of Engineering

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