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

Mohebbi, Masoud; Rezvani, Mohammad Ali

doi:10.1177/0954409717699502

Cited by 28 publications

(10 citation statements)

References 30 publications

(47 reference statements)

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“…This problem's GA objective functions are expressed to minimize all aerodynamic coefficients as specified at the literature. 15 Figures 3 to 5 present the effects of barriers distance relative to drag, lift, and roll coefficients. As noted, the considering distances of two barriers were from 11.9 to 18.5 m. It must mention that due to the high number of production results, Figures 3 to 6 present the variations of aerodynamic coefficients to barrier distance based on the porous level equal to 17%.…”

Section: Resultsmentioning

confidence: 99%

“…13 In these decades, powerful computers grow, and using them in academic and industrial research has increased. Some researchers, including Hemida and Krajnovic, 14 Mohebbi and Rezvani, [15][16][17] Ashton and Revall 18 have studied on the aerodynamic performance of high-speed trains under extreme cross wind conditions using Large Eddy Simulation (LES), Lattice Boltzmann Method (LBM), and Detached Eddy Simulation (DES).…”

Section: Introductionmentioning

confidence: 99%

“…[26][27][28] Usually, the use of barriers has been considered positive in mitigating the evapotranspiration, 28 wind-erosion control, 29,30 wind load reduction on engineering structures. 31,32 Mohebbi and Rezvani 15 found that the appropriate windbreaks geometry makes them more efficient and increases overall performance. Hashmi et al have done an experimental measurement on a stationary model of class 390 Pendolino train at 1:25 scale under wind incidence angles and in the existence of different windbreaks.…”

Section: Introductionmentioning

confidence: 99%

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The optimum model determination of porous barriers in high-speed tracks

Mohebbi

Safaee

2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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In the railway industry, safety is an essential factor that has been modified by all societies and railroad managers. Against the background of increasing speed of rolling stock, risk factors such as cross wind and train stability have received more extensive attention. In this study, the porous wind barriers that are widely used in this industry have been surveyed. Also, to decrease the harmful effects of crosswind, the work attempts to find an optimum porous barrier design. This numerical simulation was based on a modern computational fluid dynamic in microscopic space model called the Lattice Boltzmann Method. Also, to find the optimum type of barrier design, the Multi-Objective Genetic Algorithm had been used. Two aspects of barrier design, including the porosity levels and distance between barriers, have been studied and, finally, a candidate design proposed for the barriers. It was found that porousity levels up to 15% have a positive effect in reducing the lift force coefficient, but beyond that it has a negative effect. On the other hand, increasing the porosity level leads to a decrease in the drag coefficient. The velocity vectors, velocity counter, vorticity, and turbulence intensity of the flow field around the model plotted for the candidate barrier.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The optimum model determination of porous barriers in high-speed tracks

Mohebbi

Safaee

2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…5–11 There are three main research methods, namely full-scale vehicle test, 12 wind tunnel test, 13–15 and numerical simulation. 11,16,17 Factors affecting the aerodynamic characteristics of a train in crosswind are as follows: Reynolds number, 3,13,18 yaw angle, 14,19,20 embankment, 10,11,21 train nose shape, 22,23 train length, 24 windbreak wall, 25,26 etc. From the point of view of saving time and cost, numerical simulation is an effective method for simulating train aerodynamic performance in crosswind.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the effect of damaged windows on aerodynamic characteristics of passenger trains under strong crosswind

Niu

Wang

Liu

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Sand and gravel blown up by strong wind will cause damage to windows. Following up, it will cause the change in the flow field around a train immediately, which has a significant impact on the aerodynamic performance of the train. Delayed detached-eddy simulation based on the shear stress transport κ-ω turbulence model was used to investigate the aerodynamic characteristics of passenger vehicles under crosswind, and the effect of damaged windows on the train aerodynamic performance and flow field around the train was analyzed and compared. The grid generation and numerical method are verified in the previous studies. Results show that the aerodynamic performance of a passenger vehicle is significantly affected by damaged windows on both sides of the passenger vehicle, both the aerodynamic lateral force and overturning moment of the passenger vehicle were decreased, and this has a small effect on the aerodynamic performance of the downstream passenger vehicle. Fluctuation of the aerodynamic lift, lateral force, and overturning moment of a vehicle with damaged windows on both sides of the vehicle is significantly increased. Damaged windows do not change the existence of the main vortices around vehicles, but the size, location, and strength of the main vortices are obviously changed, especially when windows on both sides of the vehicle are damaged. Therefore, when windows on the windward side of the vehicles are damaged, opening or broking windows on the leeward side of the vehicles will help reduce the risk of vehicles overturning and derailment.

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“…Overall, such windbreaks can be customised according to the wind speed, wind pressure and the surrounding topological conditions. Generally, wind barriers have been examined through the use of four techniques; full-scale field tests (Richardson and Richards, 1995); wind tunnel tests (Chu et al, 2013;Tomasini et al, 2015); numerical modelling (Mohebbi and Rezvani, 2017) and analytical methods (Avila-Sanchez et al, 2016). Schulte-Werning et al (2002) draws on research conducted within the TRANSAERO project that involved carrying out experimental studies to report an initial analysis of the influence of windbreaks.…”

Section: Introductionmentioning

confidence: 99%

Wind tunnel testing on a train model subjected to crosswinds with different windbreak walls

Hashmi

Hemida

Soper

2019

Journal of Wind Engineering and Industrial Aerodynamics

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Crosswind stability of high-speed trains has been a prominent research topic for several decades, primarily motivated by the frequent rail-related accidents under strong crosswinds. In this study, the influence of different windbreak walls on train aerodynamic properties whilst subjected to crosswinds was assessed. The experimental campaign measured surface pressures on a stationary 1:25 model-scale of Class 390 Pendolino train under varying wind incidence angles with different windbreak walls inside a wind tunnel. For the first time, the work considers transition regions in windbreak walls, where transition regions refer to random geometrical changes in the distance between the train and the windbreak wall. Differences in pressure distribution on the train surface with and without different windbreak walls are evident. Forces on the train are calculated using the mean pressure coefficients. Overall, at a yaw angle of 90°, the tallest windbreak wall usually provided lowest mean pressure distribution on the surface of the model train due to the shielding effects; while the windbreak wall with a transition region of 90° usually produced the highest mean pressure distribution, comparatively. At a yaw angle of 30°, the results from windbreak walls with transition regions were relatively uniform indicating a smooth pressure distribution.

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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

Cited by 28 publications

References 30 publications

The optimum model determination of porous barriers in high-speed tracks

The optimum model determination of porous barriers in high-speed tracks

Numerical study on the effect of damaged windows on aerodynamic characteristics of passenger trains under strong crosswind

Wind tunnel testing on a train model subjected to crosswinds with different windbreak walls

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