The characteristics of acoustic tones near the nozzle of jets are investigated for Mach numbers between .

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Acoustic tones in the near-nozzle region of jets: characteristics and variations between Mach numbers 0.5 and 2

A study of noise reduction mechanisms of jets with fluid inserts

The present review covers the latest evolution of computational aeroacoustics, the field that deals with the noise generated by fluid flows and its propagation in the medium. It highlights the latest findings in both free flows (jet noise) and wall-bounded flows (airfoil, airframe, and turbomachinery noise) in more and more complex environments. Among the computational aero-acoustics methods, high-order schemes of the Navier–Stokes equations on unstructured grids and the lattice Boltzmann method on Cartesian grids have emerged as excellent candidates to tackle noise problems in realistic complex geometries. The latter is also shown to be particularly efficient for both noise generation and propagation, allowing to directly estimate the noise in the far field. Two examples of application of such methods to complex jet noise and to installed airfoil noise are first presented. The first one involves compressible subsonic and supersonic flows in dual-stream nozzles and the second one subsonic flow around an airfoil embedded in the potential core of the open-jet anechoic wind tunnel as in the actual trailing-edge noise experiment. For airframe noise, large eddy simulations of scaled nose landing gear noise and three-element high-lift devices can be tackled to decipher noise sources. For turbomachinery noise, simulations of installed low-speed fans have already unveiled a wealth of details on their noise sources, whereas high-speed turbofans remain a challenge giving the high Reynolds numbers and small tip gaps involved.

The third golden age of aeroacoustics

Supersonic jets, such as the ones used in high-performance military aircraft, have both downstream and upstream noise components due to the large-scale turbulent structures and the presence of shoc...

https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2019.0082

Effect of fluid injection on turbulence and noise reduction of a supersonic jet

The current state of the use of large-eddy simulations (LESs) in jet aeroacoustics is reviewed. Various computational techniques are discussed, as well as methods to extend the LES results to the a...

Overview of the Use of Large-Eddy Simulations in Jet Aeroacoustics

The present work uses large-eddy simulations to analyze the effectiveness of a noise reduction strategy on a military-style nozzle based on the GE F400-series engines. The nozzle has a design Mach ...

Large-Eddy Simulations Analysis of Supersonic Heated Jets with Fluid Injection for Noise Reduction

The Use of Large Eddy Simulations in Jet Aeroacoustics

Aeroacoustics of Supersonic Jets With Fluidic Injection

A set of large eddy simulations is used to perform a numerical analysis of fluidic injection as a tool for noise reduction. This technique, developed at the Pennsylvania State University, allows on...

Marco Coderoni

Papers

Overview of the Use of Large-Eddy Simulations in Jet Aeroacoustics

Large-Eddy Simulations Analysis of Supersonic Heated Jets with Fluid Injection for Noise Reduction

The Use of Large Eddy Simulations in Jet Aeroacoustics

Aeroacoustics of Supersonic Jets With Fluidic Injection

Noise reduction analysis of supersonic unheated jets with fluidic injection using large eddy simulations