Noise Prediction of the LAGOON Landing Gear Using Detached Eddy Simulation and Acoustic Analogy

A four-wheel rudimentary landing gear is studied numerically by detached eddy simulation (DES) based on the Spalart-Allmaras turbulence model. The surface sound pressure level and sound pressure spectra are calculated using the obtained unsteady flow field. The investigation shows that DES can describe the steady and unsteady properties in the flow around rudimentary landing gear. It can give reasonable results since the flow around the landing gear is a massive separated flow. The results prove the feasibility of DES type methods in massive separated unsteady flow field and aerodynamic noise prediction for landing gear, and can be used in the study of landing gear noise reduction.

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Detached-Eddy Simulations Over a Simplified Landing Gear

Journal of Fluids Engineering ◽

10.1115/1.1471532 ◽

2002 ◽

Vol 124 (2) ◽

pp. 413-423 ◽

Cited By ~ 113

Author(s):

L. S. Hedges ◽

A. K. Travin ◽

P. R. Spalart

Keyword(s):

Stokes Equations ◽

Separated Flow ◽

Flow Fields ◽

Equation Model ◽

Landing Gear ◽

Navier Stokes ◽

Detached Eddy Simulation ◽

Navier Stokes Equations ◽

Instantaneous Flow ◽

Eddy Simulation

The flow around a generic airliner landing-gear truck is calculated using the methods of Detached-Eddy Simulation, and of Unsteady Reynolds-Averaged Navier-Stokes Equations, with the Spalart-Allmaras one-equation model. The two simulations have identical numerics, using a multi-block structured grid with about 2.5 million points. The Reynolds number is 6×105. Comparison to the experiment of Lazos shows that the simulations predict the pressure on the wheels accurately for such a massively separated flow with strong interference. DES performs somewhat better than URANS. Drag and lift are not predicted as well. The time-averaged and instantaneous flow fields are studied, particularly to determine their suitability for the physics-based prediction of noise. The two time-averaged flow fields are similar, though the DES shows more turbulence intensity overall. The instantaneous flow fields are very dissimilar. DES develops a much wider range of unsteady scales of motion and appears promising for noise prediction, up to some frequency limit.

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High-fidelity simulations of unsteady civil aircraft aerodynamics: stakes and perspectives. Application of zonal detached eddy simulation

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2013.0325 ◽

2014 ◽

Vol 372 (2022) ◽

pp. 20130325 ◽

Cited By ~ 35

Author(s):

Sébastien Deck ◽

Fabien Gand ◽

Vincent Brunet ◽

Saloua Ben Khelil

Keyword(s):

Turbulent Flows ◽

Hybrid Methods ◽

Landing Gear ◽

High Fidelity ◽

Detached Eddy Simulation ◽

High Lift ◽

Eddy Simulation ◽

Civil Aircraft ◽

Aircraft Aerodynamics ◽

Transonic Buffet

This paper provides an up-to-date survey of the use of zonal detached eddy simulations (ZDES) for unsteady civil aircraft applications as a reflection on the stakes and perspectives of the use of hybrid methods in the framework of industrial aerodynamics. The issue of zonal or non-zonal treatment of turbulent flows for engineering applications is discussed. The ZDES method used in this article and based on a fluid problem-dependent zonalization is briefly presented. Some recent landmark achievements for conditions all over the flight envelope are presented, including low-speed (aeroacoustics of high-lift devices and landing gear), cruising (engine–airframe interactions), propulsive jets and off-design (transonic buffet and dive manoeuvres) applications. The implications of such results and remaining challenges in a more global framework are further discussed.

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Aeroacoustic Study on a Simplified Nose Landing Gear

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.184-185.18 ◽

2012 ◽

Vol 184-185 ◽

pp. 18-23 ◽

Cited By ~ 1

Author(s):

Shuang Li Long ◽

Hong Nie ◽

Xin Xu

Keyword(s):

Simulation Analysis ◽

Sound Field ◽

Low Noise ◽

Landing Gear ◽

Broadband Noise ◽

Detached Eddy Simulation ◽

Gear Design ◽

Aeroacoustic Noise ◽

Eddy Simulation ◽

Landing Gear Noise

Simulation analysis and experiment research are performed on the aeroacoustic noise of a landing gear component in this paper. Detached Eddy Simulation (DES) is used to produce the flow field of the model. The Ffowcs-Williams/Hawkings (FW-H) equation is used to calculate the acoustic field. The sound field radiated from the model is measured in the acoustic wind tunnel. A comparison shows that the simulation results agree well with the experiment results under the acoustic far field condition. The results show that the noise radiated from the model is broadband noise. The directivity of the noise source is like a type of dipole. The wheel is the largest contributor and the strut is the least contributor to the landing gear noise. The results can provide some reference for low noise landing gear design.

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