Effects of reynolds stress on flow noise from vortex/hydrofoil interactions
Acoustic field generated by a single vortex approaching a hydrofoil is studied. A combined vortex/RANS simulation for the near-field unsteady vorticity is developed to include effects from RANS Reynolds stresses. The far-field acoustics is calculated using a vortex sound formula with the near-field vorticity as the source. The results show that at a higher incident angle when the RANS shows a substantial region with strong Reynolds stresses, there is a significant increase in the sound level due to enhanced unsteady vorticity in the shed vortices near the trailing edge.
Key wordshydroacoustics vortex method hydrofoil vortex sound
Unable to display preview. Download preview PDF.
- Morris, P. J., Long, L. N., Bangalore, A., and Wang, Q., A Parallel Three-Dimensional Computational Aeroacoustics Method Using Nonlinear Disturbance Equations, Vol. 133, 1997, pp. 56–74.Google Scholar
- Cottet, G.-H., and Koumoutsakos, P., Vortex Methods, Theory and Practice, Cambridge University Press, 2000.Google Scholar
- Shen, W. Z., and Sorensen, J. N., Aeroacoustic Modeling of Turbulent Airoil Flows, Vol. 39, No. 6, 2001, pp. 1057–1064.Google Scholar
- Z. C. Zheng, Far-field Acoustic Pressure from a System of Discrete Vortices with Time-Varying Circulation, AIAA Paper 2005-3005, 11th AIAA/CEAS Aeroacoustics Conference, May 23-25, 2005, Monterey, CA.Google Scholar