Large Eddy Simulations of a Typical European High-Speed Train Inside Tunnels

2004 ◽  
Author(s):  
Ben Diedrichs ◽  
Mats Berg ◽  
Siniša Krajnović
Keyword(s):  
High Speed ◽  
Large Eddy Simulations ◽  
High Speed Train ◽  
Large Eddy

Predicting high-speed feedback mechanisms in rectangular cavities using lattice-Boltzmann very-large eddy simulations

2021 ◽  
pp. 106908
Author(s):  
Simone Mancini ◽  
Alexander Kolb ◽  
Ignacio Gonzalez-Martino ◽  
Damiano Casalino
Keyword(s):  
Lattice Boltzmann ◽  
High Speed ◽  
Large Eddy Simulations ◽  
Feedback Mechanisms ◽  
Large Eddy

Large-Eddy Simulations and Measurements of a Small-Scale High-Speed Coflowing Jet

AIAA Journal ◽  
2010 ◽  
Vol 48 (5) ◽  
pp. 963-974 ◽  
Author(s):  
Simon Eastwood ◽  
Paul Tucker ◽  
Hao Xia ◽  
Paul Dunkley ◽  
Peter Carpenter
Keyword(s):  
High Speed ◽  
Large Eddy Simulations ◽  
Small Scale ◽  
Large Eddy

Aerodynamic Noise Reduction Analysis in High-Speed Train Cab

2014 ◽  
Vol 1049-1050 ◽  
pp. 1022-1025
Author(s):  
Xiao Feng Zhang ◽  
You Gang Xiao ◽  
Liang Sun ◽  
Yu Shi
Keyword(s):  
High Speed ◽  
Power Flow ◽  
Simulation Method ◽  
Aerodynamic Noise ◽  
High Speed Train ◽  
Interior Decoration ◽  
Eddy Simulation ◽  
Head Surface ◽  
Large Eddy ◽  
Fluctuation Pressure

In order to reduce aerodynamic noise in high-speed train cab,the SEA model of cab is established. The fluctuation pressures from train head surface are calculated by large eddy simulation method. Using fluctuation pressure as excitation force, power flow caused by airflow among sub-systems of SEA model of cab is obtained. Two schemes are put forward to reduce the aerodynamic noise in cab, namely interior decoration modification and windowpane thickness increase. The results show that when a layer of splint with 0.01 m thickness, 0.5 loss factor is added to the original decoration in cab, the overall sound pressure level (SPL) at driver head location will reduce 1.23 dB(A). When the cab windowpane thickness is increased to 5 mm from 4 mm, the overall SPL at the driver head location will reduce 0.87 dB(A).

Shape Optimization of High-Speed Train Pantograph Insulators for Low Aerodynamic Noise

2012 ◽  
Vol 249-250 ◽  
pp. 646-651
Author(s):  
Xiao Yan Yang ◽  
You Gang Xiao ◽  
Yu Shi
Keyword(s):  
Shape Optimization ◽  
Sound Pressure Level ◽  
High Speed ◽  
Sound Pressure ◽  
Pressure Level ◽  
Aerodynamic Noise ◽  
High Speed Train ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Elliptical Section

With large eddy simulation(LES) and Lighthill-Curle acoustic theory, the aerodynamic noises radiated from pantograph insulators with rectangular, circular, elliptical section were calculated, and the optimal pantograph insulator shape was obtained. The results show that in the same model, the sound pressure level (SPL) spectrum at different monitoring points are basically the same, but the amplitude is different. In different models, the SPL spectrum are different. As for rectangular, circular, elliptical section insulators, the frequency with maximum SPL reduces gradually. For reducing aerodynamic noise, the elliptical section insulator is optimal, and the long elliptical axis should be consistent with air flow. The pantograph with bigger and less components is helpful to reduce the aerodynamic noise.

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