Study of flow characteristics in tunnels induced by canyon wind

Chen, Tao; Li, Yaozhuang; Luan, Dia; Jiao, Ao; Yang, Lanting; Fan, Chuangang; Shi, Long

doi:10.1016/j.jweia.2020.104236

Cited by 30 publications

(5 citation statements)

References 47 publications

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“…(1) Lidar can measure and record wind parameters in the field for a long time, and in view of the effective ratio β, measurements taken can obtain higher quality data when the weather is clear. (2) The wind field data during the measuring period were selected and analyzed, and it is found that the wind field parameter showed nonuniform characteristics in time and height. (3) The nondimensional wind speed profile was divided into three types (mussy, linear, and piecewise exponential pattern), and the regularity of power exponent is not obvious.…”

Section: Discussionmentioning

confidence: 99%

“…Vertical wind and turbulence profiles The research on mountainous valley wind parameters by scholars mainly applies the methods of wind tunnel terrain model test, numerical simulation, and field measurement. Wind tunnel terrain model test is widely used, but there is room for improvement in accuracy because of characteristic flow simulation and scaling model making [1][2][3]. With the development of computer technology and computational fluid dynamic (CFD), numerical simulation methods have been applied more and more widely, and their reliability has also been verified [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on Wind Field Characteristics Measured by Lidar in a U-Shaped Valley at a Bridge Site

Wang

et al. 2021

Applied Sciences

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Currently, research on wind fields of U-shaped valleys is rarely reported, and anemometers or wind observation towers are usually used for field measurement, but the measured position is limited and the cost is high. In order to study the wind characteristics in a mountainous U-shaped valley, a long-range, all-weather, high-precision Wind3D 6000 lidar was placed at a bridge site located in a U-shaped valley. Then, according to the data effective ratio and wind speed, nearly 6 months of original data ranging from 0 m to 810 m were analyzed statistically. It was found that the spatio-temporal distribution of wind speed and direction is obviously not uniform, and the wind parameters are correlated among different virtual wind towers (VWTs). By classification, the effective data of midspan position is taken as the research object, and the wind speed profile is divided into three categories. Type-1 shows disorderly characteristics; Type-2 shows a linear relationship; and Type-3 shows a nonlinear relationship. The wind direction is consistent with the main wind direction at the bridge site and the average wind direction of different VWTs has a high consistency. The concept of wind-direction deflection rate is put forward to describe the variation of wind direction with height. These measured wind parameters could be used as a reference for bridge wind-resistant design.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Wind Field Characteristics Measured by Lidar in a U-Shaped Valley at a Bridge Site

Wang

et al. 2021

Applied Sciences

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“…On the basis of FDS simulation of the flow field in the tunnel affected by external wind, Yi [8] et al carried out small-size experiments and obtained a dimensionless flame length prediction model under the influence of environmental wind. Chen [9] 's research shows that the gas flow characteristics in tunnels induced by ambient wind are mainly affected by the hydraulic diameter of the tunnel, and there is little difference in gas flow characteristics in tunnels with different shapes but the same hydraulic diameter. Yao [10] studied the influence of ambient wind on the pool fire combustion characteristics (MLRPUA) in the open environment and tunnel.…”

Section: Introductionmentioning

confidence: 99%

Effects of Environmental Wind on Natural Smoke Exhaust in a Tunnel with One Blocked End

Chen

Weng

Liu

2022

Advances in Transdisciplinary Engineering

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In order to investigate the effect of environmental wind on a tunnel with one blocked end fire under natural ventilation, a series of numerical simulations were conducted using large eddy simulation method in this study. The tunnel model is established by using the numerical simulation software FDS, and 36 groups of working conditions such as wind speed of 0-5m / s and wind angle of 45-135 are simulated. Combined with the simulation results of smoke spread, temperature and velocity vector, the smoke flow characteristics and temperature distribution characteristics in the tunnel with one blocked are analyzed, and some effects of the changes of ambient wind speed and direction on natural smoke exhaust in a tunnel with one blocked end are obtained.

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“…The results show that the CFD method can draw the same conclusion as the wind tunnel test when using the appropriate calculation model (Cao et al, 2012;Tamura and Kareem, 2013). It is worth noting that the research has shown that the wind parameter profile in the mountainous gorge area does not meet the power-law or logarithmic law distribution, but there is no in-depth analysis of its reasonable profile model (Holtslag, 1984;Barnéoud and Ek, 2020;Chen et al, 2020). Therefore, it is still necessary to use the measured data to study the wind field of this complex terrain, which has important reference value for further understanding and summarizing the wind field characteristics of the deep gorge area.…”

Section: Introductionmentioning

confidence: 99%

Combined wind profile characteristics based on wind parameters joint probability model in a mountainous gorge

Zhang

Jiang

et al. 2022

Nat Hazards

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Long-span bridges in mountainous areas are greatly disturbed by wind, and the wind field in the mountain gorge bridge site is extremely complex. Therefore, it is of great engineering significance to accurately evaluate the wind field characteristics of this kind of terrain. In this paper, to enhance understanding of this kind of wind field, the wind field in a mountainous gorge is measured for a long time using wind radar, and the mean wind parameters is statistically analyzed.The results show that the mean wind parameters vary greatly under different wind directions, and the wind speed profile does not meet the power-law model. Therefore, a mixed model suitable for the wind speed profile in a mountainous gorge is proposed. Additionally, GEV distribution and Logistic distribution are found to be suitable for describing the distribution characteristics of wind speed and angle of attack, respectively. In addition, considering the correlation between wind parameters, this paper also constructs the joint probability model of wind speed and angle of attack at different heights by the Copula function. Thus, a combined wind parameters profile model is developed under different exceedance probabilities based on the inverse first-order reliability method (IFORM). This study can provide a reference for the construction of the joint probability model of wind parameters.

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Study of flow characteristics in tunnels induced by canyon wind

Cited by 30 publications

References 47 publications

Research on Wind Field Characteristics Measured by Lidar in a U-Shaped Valley at a Bridge Site

Research on Wind Field Characteristics Measured by Lidar in a U-Shaped Valley at a Bridge Site

Effects of Environmental Wind on Natural Smoke Exhaust in a Tunnel with One Blocked End

Combined wind profile characteristics based on wind parameters joint probability model in a mountainous gorge

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