The running safety for high speed trains involves the evaluation of the overturning risk associated to crosswind aerodynamic forces. This study uses a numerical CFD tool to predict the shielding effect of wind-break fences on an ETR500 high speed train. The analysis of the aerodynamic performances of the train is conducted by varying some design parameters of the wind-breaks as the height of the barrier, the fence porosity and the inclination of the barrier slots. The shielding effect has been evaluated by analyzing the aerodynamic forces acting on the train. As a result it has been found that the shielding effect of a wind break fence can be maintained by reducing the porosity of the slots, while inclination has less influence on the aerodynamic forces on the train
The running safety for high speed trains involves the evaluation of the overturning risk associated to crosswind aerodynamic forces. This study uses a numerical CFD tool to predict the shielding effect of wind-break fences on an ETR500 high speed train. The analysis of the aerodynamic performances of the train is conducted by varying some design parameters of the wind breaks as the height of the barrier, the fence porosity and the inclination of the barrier slots. The shielding effect has been evaluated by analyzing the aerodynamic forces acting on the train. As a result it has been found that the shielding effect of a wind break fence can be maintained by reducing the porosity of the slots, while inclination has less influence on the aerodynamic forces on the train
One of the main countermeasures to the problem of crosswind in railway vehicles is the introduction of windbreaks in the windiest points of a railway line. However, in some cases due to the morphology of the terrain or because operational reasons, gaps can be found in the stretch of windbreaks with a consequently reduction of efficiency. The goal of this work is to develop a methodology for the evaluation of the effects on the safety to crosswind of high-speed trains running in a track where a gap is present in barriers. An innovative numerical-experimental procedure has been developed based on experimental full-scale tests, wind tunnel tests, CFD with moving mesh and multi-body simulations. An "amplification function", defined as a non-dimensional function which represents the amplification effect due to the gap was evaluated for different scenarios. This amplification function is then combined with the force, obtained with the stochastic methodology for the evaluation of the aerodynamic force in presence of turbulent wind. The new forces accounting for the gap presence in the windbreak barriers, are the input of the multi-body model used for the evaluation of the train stability by computing the CWC, it means, the critical wind speeds that leads the vehicle to overcome the overturning safety limit threshold. The results for a highspeed train and porous windbreaks with gap of different dimensions have shown a reduction in CWC values.
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