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논문 기본 정보

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학술저널
저자정보
저널정보
대한기계학회 Journal of Mechanical Science and Technology Journal of Mechanical Science and Technology Vol.20 No.12
발행연도
2006.12
수록면
2,292 - 2,314 (23page)

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Efficient numerical method is developed for the prediction of aerodynamic noise generation and propagation in low Mach number flows such as aeolian tone noise. The proposed numerical method is based on acoustic/viscous splitting techniques of which acoustic solvers use simplified linearised Euler equations, full linearised Euler equations and nonlinear perturbation equations as acoustic governing equations. All of acoustic equations are forced with immersed surface dipole model which is developed for the efficient computation of aerodynamic noise generation and propagation in low Mach number flows in which dipole source, originating from unsteady pressure fluctuation on a solid surface, is known to be more efficient than quadrupole sources. Multi-scale overset grid technique is also utilized to resolve the complex geometries. Initially, aeolian tone from single cylinder is considered to examine the effects that the immersed surface dipole models combined with the different acoustic governing equations have on the overall accuracy of the method. Then, the current numerical method is applied to the simulation of the aeolian tones from twin cylinders aligned perpendicularly to the mean flow and separated 3 diameters between their centers. In this configuration, symmetric vortices are shed from twin cylinders, which leads to the anti-phase of the lift dipoles and the in-phase of the drag dipoles. Due to these phase differences, the directivity of the fluctuating pressure from the lift dipoles shows the comparable magnitude with that from the drag dipoles at 10 diameters apart from the origin. However, the directivity at 100 diameters shows that the lift-dipole originated noise has larger magnitude than, but still comparable to, that of the drag-dipole one. Comparison of the numerical results with and without mean flow effects on the acoustic wave emphasizes the effects of the sheared background flows around the cylinders on the propagating acoustic waves, which is not generally considered by the classic acoustic analogy methods. Through the comparison of the results using the immersed surface dipole models with those using point sources, it is demonstrated that the current methods can allow for the complex interactions between the acoustic wave and the solid wall and the effects of the mean flow on the acoustic waves.
#Computational Aeroacoustics #Tone Noise #Twin-Cylinder #Immersed Surface Dipole #Viscous/Acoustic Splitting Method

목차

1. Introduction
2. Fundamental Equations
3. Numerical Methods
4. Numerical Results for Aeolian Tones from Single Cylinders
5. Numerical Results for Aeolian Tones from Twin Cylinders
6. Conclusions
Acknowledgments
References

참고문헌 (36)

참고문헌 신청
Bayliss, A. and Turkel, E., 1982 "Far Field Boundary Conditions for Compressible Flow," Journal of Computational Physics, Vol.48, pp.182~199. google schola Bin, J., Cheong, C. and Lee, S., 2004, "Optimized Boundary Treatment of Curved Walls for High-Order Computational Aeroacoustics Schemes," AIAA Journal, Vol.42, No.2, pp.414~417. google schola Blake, W. K. 1986, Mechanics of Flow-Induced Sound and Vibration, Academic Press, INC., Vol.1 pp.280~283. google schola Blevins, R. D. and Ressler, M. M., 1993, "Experimentals on Acoustic Resonance in Heat Exchanger Tube Bundles," Journal of Sound Vibration, Vol.164, No.3, pp.503~533. google schola Benhamadouche, S. and Laurence, D., 2003, "LES, Coarse LES, and Transient RANS Comparisons on the Flow Across a tube Bundle," International Journal of Heat and Fluid Flow, Vol.24, pp.470~479. google schola

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