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The University of Southampton
Engineering

Research project: Aerodynamic noise of high-speed train bogies

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Numerical simulation and noise control of the bogie aerodynamic noise

For train speeds above about 300 km/h the noise contribution from aerodynamic sources becomes important and it increases rapidly for further increases of speed. The train bogie region is one of the major contributors to the overall aerodynamic noise. However, due to the complex geometry of the bogie and its complicated working condition, field measurements and simulations of its aerodynamic noise are very difficult.

This project aims to investigate the noise generation mechanisms, including the main noise source region, the frequency characteristics of the source, and the key factors that affect its generation. Computational fluid dynamics (CFD) and computational aeroacoustics (CAA) are used, and one of the goals is to explore a feasible numerical simulation process with reliable accuracy.

The simulation of the aerodynamic noise of the bogie can be divided into two steps:

1) Flow field simulation

The flow field simulation forms the basis of the aerodynamic noise predictions. A grid system with sufficiently fine boundary layer grid and acceptable grid quality and quantity throughout the domain is developed to discretise the bogie region.   

For the turbulence model, the Delayed Detached Eddy Simulation (DDES) is chosen considering the trade-off between computational cost and accuracy.  The fluid flow field is simulated and the noise source information is extracted during the simulation.

Side view of the vortex structure of the bogie
Side view of the vortex structure of the bogie
Bottom view of the vortex structure of the bogie
Bottom view of the vortex structure of the bogie

2) Far field noise simulation

The pressure fluctuation on the bogie surface, which is extracted in the first step, is taken as the input of the Ffowcs Williams-Hawkings (FW-H) equation, which is used to calculate the far field noise.

Finally, some noise reduction measures will be developed based on the results of the numerical simulations.

The project is sponsored by Southwest Jiaotong University (SWJTU), Chengdu, China.

Schematic of the noise simulation
Schematic of the noise simulation

Associated research themes

Railway noise and vibration

Related research groups

Dynamics Group
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