Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)

Korean Society of Ocean Engineers (한국해양공학회)
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Numerical Simulation of the Aeolian Tone Generated from Two-dimensional Circular Cylinder

2차원 원주로부터 발생하는 Aeolian tone의 수치계산

  • Kang, Ho-Keun (School of Transport Vehicle Engineering.Institute of Marine Industry, Gyeongsang National University) ;
  • Ro, Ki-Deok (School of Transport Vehicle Engineering.Institute of Marine Industry, Gyeongsang National University) ;
  • Son, Yeong-Tae (Graduate School, Gyeongsang National University)
  • 강호근 (경상대학교 수송기계공학부.해양산업 연구소) ;
  • 노기덕 (경상대학교 수송기계공학부.해양산업 연구소) ;
  • 손영태 (경상대학교 대학원)
  • Published : 2002.10.25
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Abstract

Acoustic sounds generated by a uniform flow around a two-dimensional circular cylinder at Re=200 are simulated using finite difference lattice Boltzmann method. A third-order-accurate up-wind scheme is used for spartial derivatives, and a second-order-accurate Runge-Kutta scheme is used for time marching. The results show that in capturing very small acoustic pressure fluctuation with same frequency of Karman vortex street compared with the pressure fluctuation around a circular cylinder. The propagation velocity of acoustic sound is presented that acoustic which approaches tire upstream due to Doppler effect in the uniform flow slowly propagates, while that for the downstream quickly propagates. It is also apparent that the size of sound pressure is proportional for central distance $r^{-1/2}$ of the cylinder.

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