Abstract
In this paper, the distribution of dipole sound sources at the bogie section of high speed trains are predicted numerically. The three-dimensional unsteady flow around a train is solved by the large eddy simulation technique. The time history of vortices show that the unstable shear layer separated at the leading edge of the bogie section releases vortices periodically. A compact Green's function adapted to the shape is also given numerically by solving Laplace equation. By coupling the instantaneous flow properties with the compact Green's function, the distribution of dipole sources is obtained. The results show that a strong dipole source is generated at the trailing edge of the bogie section where the shape changes greatly and the variation of flow over time is also great.
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