The major techniques for measuring jet noise have significant drawbacks, especially when including engine installation effects such as jet–flap interaction noise. Numerical methods including low order correlations and Reynolds-averaged Navier–Stokes (RANS) are known to be deficient for complex configurations and even simple jet flows. Using high fidelity numerical methods such as large eddy simulation (LES) allows conditions to be carefully controlled and quantified. LES methods are more practical and affordable than experimental campaigns. The potential to use LES methods to predict noise, identify noise risks, and thus modify designs before an engine or aircraft is built is a possibility in the near future. This is particularly true for applications at lower Reynolds numbers such as jet noise of business jets and jet-flap interaction noise for under-wing engine installations. Hence, we introduce our current approaches to predicting jet noise reliably and contrast the cost of RANS–numerical-LES (RANS–NLES) with traditional methods. Our own predictions and existing literature are used to provide a current guide, encompassing numerical aspects, meshing, and acoustics processing. Other approaches are also briefly considered. We also tackle the crucial issues of how codes can be validated and verified for acoustics and how LES-based methods can be introduced into industry. We consider that hybrid RANS–(N)LES is now of use to industry and contrast costs, indicating the clear advantages of eddy resolving methods.
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August 2017
Research-Article
Predictive Large Eddy Simulation for Jet Aeroacoustics–Current Approach and Industrial Application
Iftekhar Naqavi,
Iftekhar Naqavi
Department of Engineering,
University of Cambridge,
Cambridge CB2 1PZ, UK
University of Cambridge,
Cambridge CB2 1PZ, UK
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Zhong-Nan Wang,
Zhong-Nan Wang
Department of Engineering,
University of Cambridge,
Cambridge CB2 1PZ, UK
University of Cambridge,
Cambridge CB2 1PZ, UK
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Paul Tucker,
Paul Tucker
Department of Engineering,
University of Cambridge,
Cambridge CB2 1PZ, UK
University of Cambridge,
Cambridge CB2 1PZ, UK
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Peer Boehning
Peer Boehning
System Design, Aeroacoustics
Rolls-Royce Deutschland
Dahlewitz, Germany
Rolls-Royce Deutschland
Dahlewitz, Germany
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James Tyacke
Iftekhar Naqavi
Department of Engineering,
University of Cambridge,
Cambridge CB2 1PZ, UK
University of Cambridge,
Cambridge CB2 1PZ, UK
Zhong-Nan Wang
Department of Engineering,
University of Cambridge,
Cambridge CB2 1PZ, UK
University of Cambridge,
Cambridge CB2 1PZ, UK
Paul Tucker
Department of Engineering,
University of Cambridge,
Cambridge CB2 1PZ, UK
University of Cambridge,
Cambridge CB2 1PZ, UK
Peer Boehning
System Design, Aeroacoustics
Rolls-Royce Deutschland
Dahlewitz, Germany
Rolls-Royce Deutschland
Dahlewitz, Germany
1Corresponding author.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received September 9, 2016; final manuscript received December 16, 2016; published online March 15, 2017. Assoc. Editor: Rakesh Srivastava.
J. Turbomach. Aug 2017, 139(8): 081003 (13 pages)
Published Online: March 15, 2017
Article history
Received:
September 9, 2016
Revised:
December 16, 2016
Citation
Tyacke, J., Naqavi, I., Wang, Z., Tucker, P., and Boehning, P. (March 15, 2017). "Predictive Large Eddy Simulation for Jet Aeroacoustics–Current Approach and Industrial Application." ASME. J. Turbomach. August 2017; 139(8): 081003. https://doi.org/10.1115/1.4035662
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