Numerical Simulation of Unsteady Flow and Flow Induced Sound of Airfoil and Wing/Plate Junction by LES and FW-H Acoustic Analogy

Abstract:

Numerical simulation of unsteady flow and flow-induced sound of an airfoil and a wing/plate junction are performed in the paper by large eddy simulation (LES) and FW-H acoustic analogy. The vortical flows around a NACA0015 airfoil at two angles of attack (0°and 8°) are simulated and analyzed by vortex identification. Simultaneously, the wall pressure fluctuations of the airfoil are computed. At two angles of attack, the flow induced sound of the airfoil is predicted. The computed power spectra agree well with experimental measurements. So the capability of large eddy simulation in predicting unsteady flow and flow induced sound is validated. Subsequently, the horse-shoe vortex around a wing/plate junction in water is computed. Furthermore, the calculations of wall pressure fluctuations and flow induced sound of the junction model at three velocities are accomplished. The predicted results are compared favorably with measured data in large circulation water channel. So the numerical approach for flow induced sound of wing/plate junction in water is validated. It shows that the numerical simulation method in the paper is credible.

• Periodical: Applied Mechanics and Materials (Volumes 444-445)
• Pages: 479-485
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.444-445.479
• Online since: October 2013
• Authors: Nan Zhang, Shi Jin Lv, Hua Xie, Sheng Li Zhang
• Keywords: Acoustic Analogy, Airfoil, Flow Induced Sound, Horse-Shoe Vortex, LES, Pressure Fluctuation, Wing/Plate Junction

References

[1] Wang, M. and Moin, P., Computation of Trailing-Edge Flow and Noise Using Large-Eddy Simulation, AIAA Journal, Vol. 38, No. 12, 2000, p.2201–2209.

DOI: 10.2514/2.895

[2] Manoha, E., Herrero, C., Sagaut, P. and Redonnet, S., Numerical Prediction of Airfoil Aerodynamic Noise, AIAA Paper 2002-2573, (2002).

DOI: 10.2514/6.2002-2573

[3] Oberai, A., Roknaldin, F. and Hughes, Th., Computation of Trailing-Edge Noise Due to Turbulent Flow over an Airfoil, AIAA Journal, Vol. 40, No. 11, 2002, p.2206–2216.

DOI: 10.2514/3.15312

[4] Olivier Marsden, Christophe Bogey and Christophe Bailly, Direct Noise Computation of the Turbulent Flow Around a Zero-Incidence Airfoil, AIAA Journal, Vol. 46, No. 4, April 2008, pp.874-882.

DOI: 10.2514/1.29825

[5] J. Winkler and S. Moreau, LES of the trailing-edge flow and noise of a NACA6512-63 airfoil at zero angle of attack, Center for Turbulence Research, Proceedings of the Summer Program, 2008, pp.331-342.

[6] William J. Devenport, JoshuaK. Staubs, StewartA.L. Glegg, Sound radiation from real airfoils in turbulence, Journal of Sound and Vibration 329, 2010, p.3470–3483.

DOI: 10.1016/j.jsv.2010.02.022