Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Application of the Internal Degree of Freedom to 3D FDLB Model and Simulations of Aero-Acoustic

3차원 차분격자볼츠만 모델에의 내부자유도 적용 및 유동소음 모사

  • Kang, Ho-Keun (Institute of Marine Industry, Gyeongsang National University) ;
  • Ahn, Soo-Whan (Department of Mechanical and Aerospace Engineering, Institute of Agriculture & Life Sciences, Gyeongsang National University) ;
  • Kim, Jeong-Whan (Korea Marine Equipment Research Institute)
  • 강호근 (경상대학교 해양산업연구소) ;
  • 안수환 (경상대학교 기계항공공학부, 농생명과학연구원) ;
  • 김정환 (한국조선기자재연구원)
  • Published : 2006.10.20
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Abstract

A 3-dimensional FDLB model with additional internal degree of freedom is applied for diatomic gases such as air, in which an additional distribution function is introduced. Direct simulations of aero-acoustic by using the applied model and scheme are presented. Speed of sound is correctly recovered. As typical examples, the Aeolian tone emitted by a circular column is successfully simulated even very low Mach number flow. Acoustic pressure fluctuations with the same frequency of the Karman vortex street compared with the pressure fluctuation around a circular column is captured. Full three-dimensional acoustic wave past a compact block like pentagon, furthermore, is also emitted in y direction as dipole like sound.

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References

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