한국전산유체공학회:학술대회논문집
- 한국전산유체공학회 2006년도 추계 학술대회논문집
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- Pages.22-25
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- 2006
Direct Simulations of Aerodynamic Sounds by the Finite Difference and Finite Volume Lattice Boltzmann Methods
- Tsutahara, Michihisa (Graduate School of Science and Technology, Kobe University) ;
- Tamura, Akinori (Graduate School of Science and Technology, Kobe University) ;
- Motizuki, Kazumasa (Graduate School of Science and Technology, Kobe University) ;
- Kondo, Takamasa (Graduate School of Science and Technology, Kobe University)
- 발행 : 2006.10.13
초록
Direct simulations of aerodynamic sound, especially sound emitted by rapidly rotating elliptic cylinder by the finite difference lattice Boltzmann method (FDLBM). Effect of pile-fabrics for noise reduction is also studied by the finite volume LBM (FVLBM) using an unstructured grid. Second order time integration and third order upwind scheme are shown to be enough for these simulations. Sound sources are detected to be doublets for both cases. For the elliptic cylinder, the doublet is generated in the interaction between the vortex and the edge. For the circular cylinders, they are generated synchronizing with the Karman vortex street, and it is also shown that the pile-fabrics covering the surface of the cylinder reduces the strength of the source.