Large eddy simulation of flow development and noise generation of free and swirling jets

2013 ◽  
Vol 25 (12) ◽  
pp. 126103 ◽  
Author(s):  
Zhen-Hua Wan ◽  
Lin Zhou ◽  
Hai-Hua Yang ◽  
De-Jun Sun
Keyword(s):  
Large Eddy Simulation ◽  
Noise Generation ◽  
Swirling Jets ◽  
Eddy Simulation ◽  
Flow Development ◽  
Large Eddy

scholarly journals LARGE EDDY SIMULATION OF ISOTHERMAL TURBULENT SWIRLING JETS

2007 ◽  
Vol 179 (8) ◽  
pp. 1481-1525 ◽  
Author(s):  
W. MALALASEKERA ◽  
K. K. J. RANGA DINESH ◽  
S. S. IBRAHIM ◽  
M. P. KIRKPATRICK
Keyword(s):  
Large Eddy Simulation ◽  
Swirling Jets ◽  
Eddy Simulation ◽  
Large Eddy

Noise Prediction of Pressure-Mismatched Jets Using Unstructured Large Eddy Simulation

2011 ◽  
Author(s):  
Yaser Khalighi ◽  
Frank Ham ◽  
Parviz Moin ◽  
Sanjiva K. Lele ◽  
Robert H. Schlinker
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flow ◽  
Three Dimensional ◽  
Empirical Models ◽  
Nozzle Geometry ◽  
High Fidelity ◽  
Noise Generation ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Generation Mechanisms

It is our premise that significant new advances in the understanding of noise generation mechanisms for jets and realistic methods for reducing this noise can be developed by exploiting high-fidelity computational fluid dynamics: namely large eddy simulation (LES). In LES, the important energy-containing structures in the flow are resolved explicitly, resulting in a time-dependent, three-dimensional realization of the turbulent flow. In the context of LES, the unsteady flow occurring in the jet plume (and its associated sound) can be accurately predicted without resort to adjustable empirical models. In such a framework, the nozzle geometry can be included to directly influence the turbulent flow including its coherent and fine-scale motions. The effects of propulsion system design choices and issues of integration with the airframe can also be logically addressed.

scholarly journals Wall-resolved large eddy simulation for aeroengine aeroacoustic investigation

2017 ◽  
Vol 121 (1242) ◽  
pp. 1032-1050 ◽  
Author(s):  
Y. Lin ◽  
R. Vadlamani ◽  
M. Savill ◽  
P. Tucker
Keyword(s):  
Large Eddy Simulation ◽  
Research Group ◽  
Near Field ◽  
Wake Flow ◽  
Computational Simulations ◽  
Trailing Edge Noise ◽  
Eddy Simulation ◽  
Flow Development ◽  
Large Eddy ◽  
Wall Flow

ABSTRACTThe work presented here forms part of a larger project on Large-Eddy Simulation (LES) of aeroengine aeroacoustic interactions. In this paper, we concentrate on LES of near-field flow over an isolated NACA0012 aerofoil at zero angle-of-attack and a chord based Reynolds number ofRec= 2 × 105. A wall-resolved compressible Numerical Large Eddy Simulation (NLES) approach is employed to resolve streak-like structures in the near-wall flow regions. The calculated unsteady pressure/velocity field will be imported into an analyticallybased scheme for far-field trailing-edge noise prediction later. The boundary-layer mean and root-mean-square (rms) velocity profiles, the surface pressure fluctuation over the aerofoil, and the wake flow development are compared with experimental data and previous computational simulations in our research group. It is found that the results from the wall-resolved compressible NLES are very encouraging as they correlate well with test data. The main features of the wall-resolved compressible NLES, as well as the advantages of such compressible NLES over previous incompressible LES performed in our research group, are also discussed.

scholarly journals LARGE-EDDY SIMULATION OF NOISE GENERATED BY PULSED SUPERSONIC JETS

Akustika ◽  
2019 ◽  
Vol 34 ◽  
pp. 136-140
Author(s):  
Pavel Chernyshov ◽  
Vladislav Emelyanov ◽  
Aleksey Tsvetkov ◽  
Konstantin Volkov
Keyword(s):  
Numerical Simulation ◽  
Large Eddy Simulation ◽  
Supersonic Jet ◽  
Supersonic Jets ◽  
Jet Flows ◽  
Noise Generation ◽  
Noise Sources ◽  
Jet Streams ◽  
Eddy Simulation ◽  
Large Eddy

Development of models and methods of modelling and simulation of the mechanisms of noise generation in jet streams plays an important role in various engineering applications due to strict requirements for noise produced by different industrial devices as well as the possibilities of using sound in technological processes. The computational tools of numerical simulation of gas dynamics and aeroacoustics processes in supersonic jet flows are considered, and noise sources and noise generation mechanisms in supersonic jets are discussed. The approach to numerical simulation is based on large-eddy simulation technique allowing to resolve eddy structures in the flowfield and to predict noise generation more accurately compared to the existing tools. The results obtained show the structure of under- and over-expanded supersonic jets and could be used to calculate sources of noise in supersonic flows.

Sign in / Sign up

Export Citation Format

Share Document