Numerical simulation of sand transfer in wind storm using the Eulerian-Lagrangian two-phase flow model

Sarafrazi, Vahid; Talaee, Mohammad Reza

doi:10.1140/epje/i2019-11809-8

Cited by 10 publications

(2 citation statements)

References 29 publications

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“…The critical starting wind speed of sand particle was 5.0 m·s −1 . Aeolian sand flow is a two-phase flow [ 26 ]; there are three basic forms of sand movement: surface creep, saltation movement, and suspension movement. Among them, saltation movement is the most important form of aeolian sand movement, and the saltation sand materials account for more than half or even 3/4 of the total amount of sand in aeolian sand flow.…”

Section: Methodsmentioning

confidence: 99%

Wind Dynamic Characteristics and Wind Tunnel Simulation of Subgrade Sand Hazard in the Shannan Wide Valley of the Sichuan–Tibet Railway

Xie

Zhang

Pang

2022

IJERPH

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The Shannan wide valley section of the Sichuan–Tibet Railway is located in the middle reaches of the Yarlung Zangbo River, where sand hazard is severe. A wind tunnel simulation experiment was conducted by establishing a subgrade model and performing field observation to carry out research on the dynamic environment of blown sand and the sand hazard formation mechanism of subgrade in the Shannan wide valley. Observation results showed that the sand-moving wind of the Shannan wide valley was chiefly derived from the ENE direction, and the resultant sand transport direction was WSW. Wind speed, the frequency of sand-moving wind, the sand drift potential, and the maximum possible sand transport quantity were relatively high in the spring. Meanwhile, the dynamic of the wind-blown sand flow was further enhanced in the spring, particularly influenced by the flow action of the Yarlung Zangbo River. Thus, sand hazard mainly occurred in the spring. The Sichuan–Tibet Railway subgrade evidently changed the wind speed, the wind-blown sand flow field, and conditions of transport and accumulation. Within the distance of 5 times the model height in the windward direction and at the subgrade top center to 20 times the model height of the leeward direction was the wind speed deceleration zone, resulting in sand particle sediments. A wind speed acceleration zone appeared on the subgrade windward slope shoulder, resulting in wind-blown sand flow erosion. This study provides a scientific basis for sand hazard prevention and control in the Sichuan–Tibet Railway.

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Section: Methodsmentioning

confidence: 99%

Wind Dynamic Characteristics and Wind Tunnel Simulation of Subgrade Sand Hazard in the Shannan Wide Valley of the Sichuan–Tibet Railway

Xie

Zhang

Pang

2022

IJERPH

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“…Railway is one of the conventional ways for transferring goods and passengers in all over the world and decreasing the travel time is an important factor for attracting passengers. In high speed trains the aerodynamic loads are not negligible, therefore some important phenomena such as cross wind, slipstream, aerodynamic loads (lift and drag), pressure waves in tunnels, train nose aerodynamic shape and their side effects are under focused by researchers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Flying ballast is another aerodynamic hazard in high speed railway transportation that has attracted the attention of researchers.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of flying ballast at high speed railway applying track vibration

Talaee

Hakimzadeh

2020

Mechanics & Industry

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In this paper the complete approach is introduced for study of Ballast flying in wind tunnel considering track vibrations and aerodynamic loads. The air velocity profile under high speed train with speed of 300 km/h is introduced using an analytical approach and the intensity of under train wind is defined. About 50 kg of Iranian high speed railway ballast is adopted by random sampling and classified according to mass and aerodynamic shape. The critical velocities of ballast moving are measured by wind tunnel for all classification to obtain the ballast flying probability factor (BFPF) at two modes of with and without track vibration. Also, the conventional ballast flying risk mitigation methods in wind tunnel are reviewed and a new strategy for ballast flying risk mitigation is introduced and tested, based on the design of track surface by a special sieved group of ballasts with minimum flying probability factor. Results show that the BFPF increases in presence of vibration and the minimum value of BFPF is occurred at mass range of 150–200 g. It's stated that application of this group on the track surface may prevent from ballast flying due to passing of train with maximum speeds of 300 km/h.

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Numerical simulation on flow field, wind erosion and sand sedimentation patterns over railway subgrades

et al. 2022

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Numerical simulation of sand transfer in wind storm using the Eulerian-Lagrangian two-phase flow model

Cited by 10 publications

References 29 publications

Wind Dynamic Characteristics and Wind Tunnel Simulation of Subgrade Sand Hazard in the Shannan Wide Valley of the Sichuan–Tibet Railway

Wind Dynamic Characteristics and Wind Tunnel Simulation of Subgrade Sand Hazard in the Shannan Wide Valley of the Sichuan–Tibet Railway

Experimental study of flying ballast at high speed railway applying track vibration

Numerical simulation on flow field, wind erosion and sand sedimentation patterns over railway subgrades

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