The Impact of Air Fences Geometry on Air Flow around an ICE3 High Speed Train on a Double Line Railway Track with Exposure to Crosswinds

Abstract

Reduction in weight adjoined with the increase in the railway vehicle speed of travel added to the deteriorating effects of the crosswinds on the running behavior of high speed trains. During the past decade, many researchers have concentrated on examining the aerodynamic force and moment coefficients for the trains. Varieties of studies regarding the effects of crosswinds on the trains are accomplished. However, the need to restrain strong winds from disturbing trains running safety is not completed. This research is concerned with finding a proper solution for attenuating the worrying effects of the winds that hit the trains. Installation of air fences on the sides of the railway tracks is investigated. To serve the purpose, a variety of air fences with different heights, with and without the edges on top of the fences, at a variety of the edge lengths and angles are studied. The study covers double routed railway track while the air fences are installed on either side of the track. The train can be on the leeward or windward line. The problem solving is based on the Lattice-Boltzmann method. This research pioneers in using this method for the said purpose. It is found that by inserting the fences and increasing their heights for up to 1m, the drag forces decrease to 40 percent and the rolling moment coefficients decrease to 15 percent. The presence of the edge can also decrease the drag force for about 55 to 120 percent and decrease the rolling moment coefficients for about 30 to 115 percent in some cases. Variations in percentages of reduction are due to the different angles and the lengths of the edges.

Interaction Simulation of a Lateral Wall Distance on Aerodynamic Characteristics of a Simplified High-speed Train

“…In these researches, LBM simulations are combined with the Multi Objective Genetic Algorithm for aerodynamic design and characteristics of a high-speed railway windbreak. Mohebbi and Rezvani [14] also in 2018 performed effects of air fence geometry on air-flow around an ICE3 high-speed train on a double-line railway track with exposure to crosswinds. This research is concerned with finding a proper solution for attenuating the worrying effects of the winds that hit the trains based on the Lattice-Boltzmann method.…”

Influence of Marshalling Length on Aerodynamic Characteristics of Urban Emus under Crosswind

“…They found that there was a intense interaction between the marshalling length and the pressure fluctuations of the train. Mohebbi and Rezvani (2018) investigated how the height and type of air fences affects the rolling moment of train.…”

Field test and numerical reconstitution of natural winds at the tunnel entrance section of high-speed railway

“…Computational fluid dynamics (CFD) is an important method to understand the aerodynamic behaviour of HSRTs (Chen et al , 2019; Chen et al , 2021, 2022a, 2022b; Cuhadaroglu, 2009; Dang et al , 2015; Ma et al , 2018b, 2019, 2021; Kulak et al , 2018; Yang et al , 2018). For example, Mohebbi and Rezvani (2018, 2021) used CFD simulation to investigate the aerodynamic performance of trains when running in wind barriers and tried to optimum the porous barrier design considering the running safety of the train (Mohebbi and Safaee, 2022). Yang et al (2018) simulated the process of an HSRT entering a tunnel and found that the flow and pressure structure near the train undergoes a transient variation, which causes a pulse swing movement and a sudden fluctuation in aerodynamic loads.…”