The Proceedings of the Fluids engineering conference
Online ISSN : 2424-2896
2009
Session ID : 0211
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0211 Low-frequency pressure fluctuation in a compressible plane turbulent boundary layer
Daisuke WATANABEHiroshi MAEKAWAHajime TAKAMI
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CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract
Spatial direct numerical simulations are used to study the development of turbulent structures and the resultant sound emission mechanism in a compressible boundary layer, for a high-speed train model conducted in a moving model facility, where the free stream velocity is 500Km/h (corresponding Mach number is 0.41). Disturbances of compressible isotropic turbulence are superimposed on the laminar profile at the inlet boundary layer in the computational box. The Reynolds number at the inlet based on the displacement thickness is 1640, which meets the measurement of the boundary layer undergoing transition. Simulation results show that the inlet disturbances affect the transition and the low-frequency velocity/pressure fluctuations. Low frequency waves are generated in the turbulent boundary layer and radiated toward an open area.
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© 2009 The Japan Society of Mechanical Engineers
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