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http://dx.doi.org/10.3744/SNAK.2006.43.5.586

Application of the Internal Degree of Freedom to 3D FDLB Model and Simulations of Aero-Acoustic  

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)
Publication Information
Journal of the Society of Naval Architects of Korea / v.43, no.5, 2006 , pp. 586-596 More about this Journal
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.
Keywords
Finite difference lattice Boltzmann model; Aero-acoustic; Aeolian tone; Specific heat ratio; Internal degree of freedom;
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Times Cited By KSCI : 1  (Citation Analysis)
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