Journal of KSNVE (소음진동)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Numerical Simulation of Acoustic Field Interacting between a Vortex Ring and a Rigid Sphere

원형 고리와와 강체구의 상호작용에 의한 음향장 수치해석

  • 유기완 (한국과학기술원 기계기술연구소) ;
  • 이덕주 (한국과학기술원 항공우주공학과)
  • Published : 1997.04.01
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Abstract

The flow and acoustic fields due to a vortex ring interaction with a rigid sphere are simulated numerically. The flow field is regarded as three-dimensional inviscid and incompressible. The vorticity is assumed to be concentrated inside the finite core of vortex filament. The vortex filament curve, described by parabolic blending curve function, is used to effectively solve the modified Biot-Savart equation. The interaction between a vortex ring and a rigid sphere using the parabolic blending curve is calculated. The trajectory of the vortex ring is obtained with several different initial positions between the ring and the sphere. The force variations acting on the sphere are calculated by using the boundary integral method. Finally, we can also obtain the acoustic signals at the far field observation positions from the force variations acting on the rigid surface. We can find that the dipole axis of the directivity patterns are rotated during the interacting phenomena.

Keywords

References

  1. Proc. Roy. Soc. (London) v.211A no.1107 On Sound Generated Aerodynamically. I. General Theory Lighthill M. J.
  2. Journal of the Acoustical Society of America v.36 no.1 Theory of Vortex Sound Powell A.
  3. Journal of Fluid Mechanics v.71 Contribution to the Theory of Aerodynamic Sound, with Application to Excess Jet Noise and the Theory of the Flute Howe M. S.
  4. Journal of Fluid Mechanics v.85 On Vortex Sound at Low Mach Number M$\"{o}$hring W.
  5. Proc. Roy. Soc. (London) v.231A The Influence of Solid Boundaries upon Aerodynamic Sound Curle N.
  6. Phil. Trans. Roy. Soc. v.A264 Sound Generation by Turbulence and Surface in Arbitrary Motion Ffowcs Williams J. E.;Hawkings D. C.
  7. Journal of Fluid Mechanics v.43 Scattering of Aerodynamic Noise by a Semi-Infinite Compliant Plate Crighton D. G.;Leppington F. G.
  8. Journal of Fluid Mechanics v.155 Acoustic Wave Emitted by a Vortex Ring Passing Near the Edge of a Half Plane Kambe T.;Minota T.;Ikushima Y.
  9. Journal of Sound and Vibration v.72 The Influence of Solid Bodies on Low Mach Number Vortex Sound Obermeier F.
  10. Journal of Sound and Vibration v.119 Acoustic Waves Emitted by a Vortex Ring Passing Near a Circular Cylinder Minota T.;Kambe T.
  11. Physics of Fluids v.8 Localized-Induction Concept on a Curved Vortex and Motion of an Elliptic Vortex Ring Arms R. J.;Hama F. R.
  12. Journal of Fluid Mechanics v.109 The Evolution of an Elliptic Vortex Ring Dhanak M. R.;de Bernardinis B.
  13. The 1st International Conference on Flow Interaction Numerical Simulation of Evolution of a Vortex Ring and Its Interactions with a Rigid Sphere Ryu K. W.;Lee D. J.
  14. AIAA 96-0876 Sound Generation from Evolution of Elliptic Vortex Ring and a Vortex Ring Interaction with a Rigid Sphere Ryu K. W.;Lee D. J.
  15. Journal of Aircraft v.19 no.2 Prediction of Subsonic Aerodynamic Characteristics: A Case for Low-Order Panel Methods Maskew B.
  16. Fluid Dynamics Research v.3 Acoustic emission from interaction of a vortex ring with a sphere Minota T.;Kambe T.;Murakami T.