Numerical Simulation of the Aerodynamic Noise of the Leading Bogie of a High-Speed Train

Numerical simulations of the noise radiated by a train bogie under the leading car of a high-speed train are carried out using Computational Fluid Dynamics (CFD) and Computational Aeroacoustics (CAA). In order to reduce the grid size and increase the grid quality, a hybrid grid is used to discretize the computational domain. The Delayed Detached Eddy Simulation method with Spalart–Allmaras turbulence model is used to simulate the unsteady flow field. The aerodynamic results show that the shear layer detached from upstream of the bogie cavity is critical for the aerodynamic noise generation of the leading car. The time-varying surface pressure is collected during the unsteady simulation and then used as input for the far field noise calculation, which uses the Ffowcs Williams and Hawkings equation. The one-third octave noise spectra show broadband characteristics with the contribution from low frequencies being dominant. The results show that the bogie cavity contributes more to the sound power than the bogie itself.