A Fast Approach for Predicting Aerodynamic Noise Sources of High-Speed Train Running in Tunnel

Abstract

The aerodynamic noise of high-speed trains passing through a tunnel has gradually become an important issue. Numerical approaches for predicting the aerodynamic noise sources of high-speed trains running in tunnels are the key to alleviating aerodynamic noise issues. In this paper, two typical numerical methods are used to calculate the aerodynamic noise of high-speed trains. These are the static method combined with non-reflective boundary conditions and the dynamic mesh method combined with adaptive mesh. The fluctuating pressure, flow field and aerodynamic noise source are numerically simulated using the above methods. The results show that the fluctuating pressure, flow field structure and noise source characteristics obtained using different methods, are basically consistent. Compared to the dynamic mesh method, the pressure, vortex size and noise source radiation intensity, obtained by the static method, are larger. The differences are in the tail car and its wake. The two calculation methods show that the spectral characteristics of the surface noise source are consistent. The maximum difference in the sound pressure level is 1.9 dBA. The static method is more efficient and more suitable for engineering applications.

Numerical simulation and prediction of aerodynamic noise of high-speed trains

“…Computational Aerodynamic Acoustics (CAA) uses numerical computational methods to study the non-constant flow mechanism of noise generated by the interaction between fluid and solid boundaries in order to provide a systematic theoretical basis for noise prediction and improvement. 17 For high-speed trains with complex shapes and many components, ANSYS Fluent software is used to solve the generation and propagation processes of aerodynamic noise separately using a hybrid solution method.…”

“…Computational Aerodynamic Acoustics (CAA) uses numerical computational methods to study the non-constant flow mechanism of noise generated by the interaction between fluid and solid boundaries in order to provide a systematic theoretical basis for noise prediction and improvement. 17 For high-speed trains with complex shapes and many components, ANSYS Fluent software is used to solve the generation and propagation processes of aerodynamic noise separately using a hybrid solution method.(a) Firstly, the steady-state calculation is carried out using the Standard k−ε turbulence model to obtain the steady-state solution of the external flow field of the high-speed train. The steady state solution is used as an initial value for subsequent transient calculations.(b) For the transient part (sound field calculation), the Lighthill stress tensor (Tij) on the vehicle surface is calculated by Large Eddy Simulation (LES) with the steady state solution of the flow field as the initial state in order to construct the Lighthill equation.…”