Comparison of sound power radiation from isolated airfoils and cascades in a turbulent flow

Blandeau, Vincent P.; Joseph, Phillip; Jenkins, Gareth; Powles, Christopher

doi:10.1121/1.3569706

Cited by 40 publications

(28 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Results are compared with the flat plate analytical model developed by Amiet, 15 and adapted by Blandeau et al 38 for two-dimensional noise radiation. As in the analytical model, the background mean flow is assumed to be uniform in the CAA domain.…”

Section: Va2 Validation Case: Two-dimensional Naca 0001 Airfoilmentioning

confidence: 99%

Synthetic Turbulence Methods for Leading Edge Noise Predictions

Gea-Aguilera

Zhang

Chen

et al. 2015

21st AIAA/CEAS Aeroacoustics Conference

View full text Add to dashboard Cite

An advanced digital filter method to generate synthetic turbulence is presented for efficient two-and three-dimensional leading edge noise predictions. The technique, which is based on the Random Particle-Mesh method, produces a turbulent inflow that matches a target isotropic energy spectrum. The discretized equations for the synthetic eddies, and the input parameters needed to recover the desired turbulence statistics, are presented. Moreover, a simple and fast implementation strategy, which does not require an additional boundary condition, is presented under the frozen turbulence assumption. The method is used in a linearized Euler solver to predict turbulence-airfoil interaction noise from a number of configurations, including variations in airfoil thickness, angle of attack and Mach number. For the first time, noise predictions from a digital filter method are directly compared to those provided by synthetic turbulence based on a summation of Fourier modes. The comparison indicates that the advanced digital filter method gives enhanced performance in terms of computational cost and simulation accuracy. In addition, initial tests show that this method is capable of reproducing experimental noise measurements within 3 dB accuracy.

show abstract

Section: Va2 Validation Case: Two-dimensional Naca 0001 Airfoilmentioning

confidence: 99%

Synthetic Turbulence Methods for Leading Edge Noise Predictions

Gea-Aguilera

Zhang

Chen

et al. 2015

21st AIAA/CEAS Aeroacoustics Conference

View full text Add to dashboard Cite

show abstract

“…4. Comparison of the present results with Amiet's theoretical prediction [24,29] and existing experimental data. discrepancies were attributed to the fact that the current velocity spectra were not entirely smooth as those in the counterpart theory and experiment.…”

Section: Discussionmentioning

confidence: 51%

“…4) for both the SLE and WLE cases are plotted in Fig. 10 where a theoretical prediction by Amiet et al [24,28,29] and an experimental measurement performed at the University of Southampton are also included for comparison. It should be noted that the experimental result includes a shear-layer correction and has been scaled up by (r exp /L c ) 2 /(r sim /L c ) to match the distance to the observer position and to compensate the 3D decaying rate (p 3D ∝ r & p 2D ∝ √ r).…”

Section: Application To Aerofoil-turbulence Interaction Noisementioning

confidence: 99%

See 1 more Smart Citation

An advanced synthetic eddy method for the computation of aerofoil–turbulence interaction noise

Kim

Haeri

2015

Journal of Computational Physics

View full text Add to dashboard Cite

Please cite this article in press as: J.W. Kim, S. Haeri, An advanced synthetic eddy method for the computation of aerofoil-turbulence interaction noise, J. Comput. Phys. (2015), http://dx.doi.org/10. 1016/j.jcp.2015.01.039 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThis paper presents an advanced method to synthetically generate flow turbulence via an inflow boundary condition particularly designed for threedimensional aeroacoustic simulations. The proposed method is virtually free of spurious noise that might arise from the synthetic turbulence, which enables a direct calculation of propagated sound waves from the source mechanism. The present work stemmed from one of the latest outcomes of synthetic eddy method (SEM) derived from a well-defined vector potential function creating a divergence-free velocity field with correct convection speeds of eddies, which in theory suppresses pressure fluctuations. In this paper, a substantial extension of the SEM is introduced and systematically optimised to create a realistic turbulence field based on von Kármán velocity spectra. The optimized SEM is then combined with a well-established sponge-layer technique to quietly inject the turbulent eddies into the domain from the upstream boundary, which results in a sufficiently clean acoustic field. Major advantages in the present approach are: a) that genuinely three-dimensional turbulence is generated; b) that various ways of parametrisation can be created to control/characterise the randomly distributed eddies; and, c) that its numerical implementation is efficient as the size of domain section through which the turbulent eddies should be passing can be adjusted and minimised. The performance and reliability of the proposed SEM are demonstrated by a three-dimensional simulation of aerofoil-turbulence interaction noise.

show abstract

“…(11). The acoustic power spectrum, P(ω), can be computed using the following integral formula (Blandeau et al, 2011):…”

Section: Turbulent Inflow Boundary Conditionmentioning

confidence: 99%

Inflow broadband noise from an isolated symmetric airfoil interacting with incident turbulence

Kim

Lee

Cheong

2015

Journal of Fluids and Structures

View full text Add to dashboard Cite

Comparison of sound power radiation from isolated airfoils and cascades in a turbulent flow

Cited by 40 publications

References 12 publications

Synthetic Turbulence Methods for Leading Edge Noise Predictions

Synthetic Turbulence Methods for Leading Edge Noise Predictions

An advanced synthetic eddy method for the computation of aerofoil–turbulence interaction noise

Inflow broadband noise from an isolated symmetric airfoil interacting with incident turbulence

Contact Info

Product

Resources

About