Numerical simulation of laboratory tornado simulator that can produce translating tornado-like wind flow

Yuan, Fangping; Yan, Guirong Grace; Honerkamp, Ryan; Isaac, Kakkattukuzhy M.; Zhao, Ming; Mao, Xiaoyong

doi:10.1016/j.jweia.2019.05.001

Cited by 33 publications

(9 citation statements)

References 31 publications

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“…The wind-induced vibration of the building-elevator system comes from both average wind velocity and fluctuating wind velocity. The former one can be determined by the tornado wind profile of a certain wind scale for the distributions of tangential velocities and radial velocities along height, z, with the adjustment coefficients listed in Table 2 for the velocity inlet proposed by Yuan et al 25 As for the latter, it can be generated artificially where the target Davenport power spectrum density (PSD) function (see Equation 1a), the spatial correlation function 32 (see Equation 1b), and the fourth-order autoregressive filtering method 33 can be used.…”

Section: Generation Of Wind Force Time Historymentioning

confidence: 99%

Tornado‐induced vibration assessment of construction elevator attached to high‐rise buildings

He,

Gao,

Liang

et al. 2024

Structural Design Tall Build

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SummaryAs one of major construction facilities, the safety concern about elevator outer‐attached to slender high‐rise buildings during construction needs to be seriously addressed. To specifically identify the risk of such slender building–elevator systems in extreme tornado wind field, a safety assessment strategy using the critical velocity envelope is systematically developed. To overcome the difficulties in modeling such building–elevator system, a modified generalized flexural‐shear model developed previously was employed to reach an efficient estimate on the response of a case high‐rise building under simulated tornado wind excitations. To account for the effect of the flexibility of high‐rise building on the response of its attached construction elevator, the response of the elevator was obtained by finite element analysis with applied wind forces, as well as the displacement excitations at its supports with the building. To simulate the typical failure modes of elevator in all states, some critical reference velocity‐based envelopes were generated for the safety assessment where the factors of wind velocity, wind direction, and cage level are systematically addressed. The safety envelopes of the building–elevator system were proved to be instinctively efficient for the assessment of its wind resistance under various scenarios.

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Section: Generation Of Wind Force Time Historymentioning

confidence: 99%

Tornado‐induced vibration assessment of construction elevator attached to high‐rise buildings

He,

Gao,

Liang

et al. 2024

Structural Design Tall Build

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“…While previous studies have focused on low-rise buildings and other structures under translating tornadoes [5][6][7][8], there have been few studies on the impact of tornadoes on high-speed trains. Suzuki and Okura [9] conducted a pressure measurement test on a single train car model, with a shape similar to that of a highspeed train, passing through a simulated tornado.…”

Section: Introductionmentioning

confidence: 99%

Study of the effect of wind angles on the aerodynamic characteristics of high-speed trains subjected to a translating simulated tornado

Li,

Gan,

Zhang

et al. 2024

Front. Phys.

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The probability of high-speed trains being hit by tornadoes is increasing. Therefore, this paper studies the effect of wind angles on the aerodynamic characteristics of a high-speed train subjected to a translating simulated tornado. A small six-dimensional force/torque sensor was used to measure the aerodynamic force and moment of a high-speed train model at a reduced scale of 1:150. The models, consisting of high-speed train heads and cars with different aerodynamic shapes, displayed non-stationary characteristics in their respective aerodynamic force and moment coefficient time histories. The variation trends of the ensemble time-varying mean of the pitching moment coefficient of a high-speed train car and head, for wind angles smaller than 60° and 45°, respectively, are different from those for other wind angles. The lift force coefficient ensemble time-varying mean of the high-speed train head is asymmetrical along the longitudinal axis when the wind angle is smaller than 60°, which is different from that of the high-speed train car. The maximum values of the ensemble time-varying mean of the force and moment coefficient of the high-speed train are almost equal under different movement directions of the tornado simulator at each wind angle, which is also true for the minimum value of the force and moment coefficient of the high-speed train. The ensemble time-varying variance of the force and moment coefficient of the high-speed train model in the region of −200 mm–200 mm is greater than that in other regions. This study can contribute to a more comprehensive and accurate understanding of the interaction between tornadoes and high-speed trains.

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“…Recent advancements in the area of TLVs have seen a surge in numerical analyses. Three-dimensional numerical simulations based on Ward-type chambers have been performed by Lewellen et al, (2000), Ishihara et al, (2011), Liu et al, (2018, 2020, and Yuan et al, (2019). Gairola and Bitsuamlak, (2019) and Verma and Selvam, (2021) proposed simplified numerical setups to elucidate velocity fields within TLV generators.…”

Section: Introductionmentioning

confidence: 99%

Axisymmetric modeling to efficiently simulate tornado-like vortex in Ward-type chamber using OpenFOAM

FUJIWARA,

HATTORI,

EGUCHI

2024

Mechanical Engineering Journal

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Tornadoes represent a substantial hazard to nuclear power plant infrastructures, particularly in terms of potential damage caused by wind-borne debris. A comprehensive understanding of the three-dimensional flow structure of tornadoes is essential to assess such hazards. Ward-type tornado-like vortex (TLV) generators have been used to provide experimental insight into the influence of wind loading on potential debris and infrastructures. However, these experiments address challenges arising from highly turbulent and three-dimensional flow structures. Recent advancements in the area of TLVs have seen a surge in numerical analyses. Three-dimensional simulations are capable of reproducing the flow field, although the computational requirements appear to be prohibitive for hazard assessment applications. A numerically proficient model that could reproduce the velocity profile from TLV generators is highly regarded. To achieve this, axisymmetric modeling of TLV in a Ward-type chamber is attempted. This paper uses the VorTECH facility at Texas Tech University, a large-scale Ward-type TLV generator, as a reference case. Through a series of simulations, the critical role of the mesh resolution in the development of the boundary layer is revealed. The axisymmetric model underestimated the experimentally observed pressure at the core center while showing good agreement for the core width and velocity distribution for both single-cell and two-cell TLV flow fields. Through alterations in the domain configuration, including the influence of the inflow, floor roughness, and the presence of a honeycomb rectifier, the effect of such factors on the velocity profiles near the touchdown region was identified. The boundary layer development by the inflow inside the confluence region, the floor roughness of the touchdown region, and flow resistance at the rectifier should be carefully discussed to develop a reproducible axisymmetric TLV model.

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Numerical simulation of laboratory tornado simulator that can produce translating tornado-like wind flow

Cited by 33 publications

References 31 publications

Tornado‐induced vibration assessment of construction elevator attached to high‐rise buildings

Tornado‐induced vibration assessment of construction elevator attached to high‐rise buildings

Study of the effect of wind angles on the aerodynamic characteristics of high-speed trains subjected to a translating simulated tornado

Axisymmetric modeling to efficiently simulate tornado-like vortex in Ward-type chamber using OpenFOAM

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