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Development of Computational Fluid/Aeroacoustic Coupling Code

Article of Honda R&D Technical Review Vol.16 No.2

Summary

A rather novel coupling method is developed for predictions of aerodynamic sound fields. The flow fields are predicted by Reynolds Averaged Navier-Stokes (RANS) and the sound propagations are computed by Linearized Euler Equations (LEE). This method enables wide range aeroacoustic analyses with the lower computational cost. All simulations are performed using unstructured grid methods because of their flexibility to fit complex geometries. To validate this method in the present work computational aeroacoustic analysis around an airfoil was carried out. Sound sources are treated universally by using turbulent vortex fluctuations which induce aeroacoustic phenomena, not by the secondary pressure fluctuations on the body surfaces. This suggests a new guidance in computational aeroacoustics.

Reference

(1) Tam, C. K. W.: Computational aeroacoustics: Issues and Methods, AIAA Journal, Vol. 33, No. 10, p. 1788-1796 (1995)
(2) Wilcox, D. C.: Simulation of Transition with a Two-Equation Turbulence Model, AIAA Journal, Vol. 32, No. 2, p. 247-255 (1994)
(3) Bechara, W., Bailly, C., Lafon, P.: Stochastic Approach to Noise Modeling for Free Turbulent Flows, AIAA Journal, Vol. 32, No. 3, p. 455-463 (1994)
(4) Pao, Y. H.: Structure of turbulent velocity and scalar fields at large wave numbers, Phys. Fluids, Vol. 8, p. 1063-1075 (1965)
(5) http://www.codiciel.fr/database/acoustic/acoustic.html
(6) Brooks, T. F., Hodgson, T. H.: Trailing Edge Noise Prediction from Measured Surface Pressures, Journal of Sound and Vibration, Vol. 78(1), p. 69-117 (1981)
(7) Manoha, E., Herrero, C., Sagaut, P., Redonnet, S.: Numerical Prediction of Airfoil Aerodynamic Noise, AIAA paper, 2002-2573, p. 1730-1742 (2002)

Author (organization or company)

Toshihiro KAMATSUCHI(Wako Research Center)

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