Numerical-Experimental Analysis of Wind-Break Fences for High Speed Railway Lines

Cheli, F.; Ripamonti, F.; Schito, P.; Tomasini, G.

doi:10.4203/ccp.98.160

Cited by 2 publications

(3 citation statements)

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“…They concluded that windbreaks have significant effects in reducing the flow of air that comes back to the cars. Cheli et al 6 with wind tunnel experiments proved that for Reynolds number less than 1 Â 10 6 the aerodynamic force coefficients have negligible dependence on the variations of the Reynolds number. These tests were performed while the train was travelling along a track that was equipped with windbreaks.…”

Section: Introductionmentioning

confidence: 98%

“…But such tests provide limited information about the flow structure and patterns over the surface of the wagon. 4 Bocciolone et al 5 and Cheli et al 6 have shown that windbreaks can drastically reduce the risk of overturning of vehicles. The process of reaching at such conclusion included placing a model train in between windshields and measuring the aerodynamic coefficients.…”

Section: Introductionmentioning

confidence: 99%

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Two-dimensional analysis of the influence of windbreaks on airflow over a high-speed train under crosswind using lattice Boltzmann method

Mohebbi

Rezvani

2017

Proceedings of the Institution of Mechanical Engineers, Part F:

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This research is concerned with identifying the effects of windbreak geometry on attenuating aerodynamic loads that can be strong enough to disturb the running safety of high-speed trains. The idea is to suggest the proper geometry for the windbreaks that can make them more efficient and increase their overall performance. Generally speaking, the desired windbreak is the one that can minimize the aerodynamic forces on the surface of trains. In order to reach such an aim, the flow of air around an Intercity-Express 3 high-speed train has been estimated through a two-dimensional modeling by using the lattice Boltzmann method. The flow of crosswind that hits the train is considered as turbulent. The geometry of the windbreaks including the height, the slot, and the edge angles has been investigated. It has been concluded that the windbreak performance, among other parameters, is highly dependent on its height and edge angle. This research expedites the trail for finding suitable choices of windbreak geometries that can in turn provide a reliable degree of running safety of the railway fleet.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Two-dimensional analysis of the influence of windbreaks on airflow over a high-speed train under crosswind using lattice Boltzmann method

Mohebbi

Rezvani

2017

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…Diedrichs 9,10 performed CFD computations and discussed in detail the aerodynamics of high-speed trains. Cheli et al 11 used wind tunnel tests to prove that for a Reynolds number (Re) up to 1 Â 10 6 , force coefficients are slightly sensitive to changes in Re for the case of a train running on a track equipped with fences. Barcala and Meseguer 12 studied the effect of parapets on the aerodynamic loads experienced by a vehicle on a bridge using two-dimensional tests carried out in a wind tunnel.…”

Section: Introductionmentioning

confidence: 99%

A two-dimensional computational parametric analysis of the sheltering effect of fences on a railway vehicle standing on a bridge and experiencing crosswinds

Sesma

Larraona

Viñolas

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part F:

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In a crosswind scenario, the risk of high-speed trains overturning increases when they run on viaducts since the aerodynamic loads are higher than on the ground. In order to increase safety, vehicles are sheltered by fences that are installed on the viaduct to reduce the loads experienced by the train. Windbreaks can be designed to have different heights, and with or without eaves on the top. In this paper, a parametric study with a total of 12 fence designs was carried out using a two-dimensional model of a train standing on a viaduct. To asses the relative effectiveness of sheltering devices, tests were done in a wind tunnel with a scaled model at a Reynolds number of 1 Â 10 5 , and the train's aerodynamic coefficients were measured. Experimental results were compared with those predicted by Unsteady Reynoldsaveraged Navier-Stokes (URANS) simulations of flow, showing that a computational model is able to satisfactorily predict the trend of the aerodynamic coefficients. In a second set of tests, the Reynolds number was increased to 12 Â 10 6 (at a free flow air velocity of 30 m/s) in order to simulate strong wind conditions. The aerodynamic coefficients showed a similar trend for both Reynolds numbers; however, their numerical value changed enough to indicate that simulations at the lower Reynolds number do not provide all required information. Furthermore, the variation of coefficients in the simulations allowed an explanation of how fences modified the flow around the vehicle to be proposed. This made it clear why increasing fence height reduced all the coefficients but adding an eave had an effect mainly on the lift force coefficient. Finally, by analysing the time signals it was possible to clarify the influence of the Reynolds number on the peak-to-peak amplitude, the time period and the Strouhal number.

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Numerical-Experimental Analysis of Wind-Break Fences for High Speed Railway Lines

Cited by 2 publications

References 0 publications

Two-dimensional analysis of the influence of windbreaks on airflow over a high-speed train under crosswind using lattice Boltzmann method

Two-dimensional analysis of the influence of windbreaks on airflow over a high-speed train under crosswind using lattice Boltzmann method

A two-dimensional computational parametric analysis of the sheltering effect of fences on a railway vehicle standing on a bridge and experiencing crosswinds

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