Forces and flow structures evolution on a car body in a sudden crosswind

Volpe, Raffaele; Ferrand, Valérie; Silva, Arthur da; Moyne, Luis Le

doi:10.1016/j.jweia.2014.03.006

Cited by 44 publications

(17 citation statements)

References 25 publications

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“…Although the side force of the tail carriage peaks at t = 3.93 s, this maximum is maintained until t = 4.34 s when the side force is steady. Such a phenomenon of the tail carriage is visible in the investigation (Volpe et al, 2014). For the lift force, the value of the leading carriage peaks at t = 2.93 s and reaches its steady equivalent at t = 2.98 s. The value of the middle and tail carriages reaches its maximum at t = 3.19 s and t = 3.31 s, respectively.…”

Section: Aerodynamic Loadsmentioning

confidence: 82%

“…The results of the study by Cairns (1994) showed that the aerodynamic force for the transient gust does not overshoot compared with the corresponding value in the steady wind environment. Volpe, Ferrand, Da Silva, and Le Moyne (2014) determined that the yawing moment and side force coefficients were 16% and 7% higher than the corresponding established values, respectively, for different geometric shapes of a car body. The scattered features of the data from the aforementioned studies can be attributed to the difficulty in controlling gusty wind parameters in the wind tunnel test.…”

Section: Introductionmentioning

confidence: 78%

“…Different aerodynamic loads show time-resolved discrepancy as a train runs in ISTBT. The maximum side force of the leading and middle carriages is later than the instant that the whole body is entirely on the bridge in the crosswind because of the phase delay of the flow (Tsubokura et al, 2010;Volpe et al, 2014). However, other aerodynamic parameters are earlier based on this unsteady simulation.…”

Section: Aerodynamic Loadsmentioning

confidence: 95%

“…The comparison between the maximum and the steady values of five aerodynamic loads is provided in Table 2 to fully assess the transient response. The sharp shock induced by crosswind when a train runs in the ISTBT exerts a more serious influence than that from transient crosswinds (Tsubokura et al, 2010;Volpe et al, 2014). In particular, the yaw moment exceeds the corresponding steady values up to 71%, 628% and −17% for the leading, middle and tail carriages, respectively.…”

Section: Aerodynamic Loadsmentioning

confidence: 97%

See 3 more Smart Citations

Time-resolved aerodynamic loads on high-speed trains during running on a tunnel–bridge–tunnel infrastructure under crosswind

Deng

Yang

Deng

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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2020)Time-resolved aerodynamic loads on high-speed trains during running on a tunnel-bridge-tunnel infrastructure under crosswind, Engineering Applications of ABSTRACT A high-speed train will likely experience hazardous driving environments because of the transient effect of complex airflow condition when the train runs on the infrastructure scenario consisting of the tunnel-bridge-tunnel under crosswind. The evolution of aerodynamic loads and flow structure is investigated by numerical simulations. In these simulations, the arrangement of an infrastructural scenario refers to a real prototype under construction. Results indicate the flow structure and pressure distribution around a train change from a symmetrical state in the tunnel to a remarkable asymmetry state in the bridge within 0.1 s. This phenomenon causes a sharp aerodynamic shock on the train body. The coupling effect of the crosswind environment and the transformation of the train running scenario will likely affect the transient aerodynamic response. The maximum values of different aerodynamic loads exhibit time-resolved discrepancy when a train runs in ISTBT. The transient characteristics of the aerodynamic loads strengthen with the increase in wind speed but weaken with the increase in train speed. Such characteristics will likely deteriorate further if the wind direction is in the opposite direction relative to that of a moving train.

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Section: Aerodynamic Loadsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 78%

Section: Aerodynamic Loadsmentioning

confidence: 95%

Section: Aerodynamic Loadsmentioning

confidence: 97%

See 2 more Smart Citations

Time-resolved aerodynamic loads on high-speed trains during running on a tunnel–bridge–tunnel infrastructure under crosswind

Deng

Yang

Deng

et al. 2019

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

show abstract

“…Considering the importance of the transient aerodynamics, numerous researchers have carried out wind tunnel experiments (Passmore et al 2001;Zhu et al 2010) or adopted advanced test methods (Lichtneger et al 2015;Volpe et al 2014) to evaluate it. Using experiment or adopting advanced test method to study the transient aerodynamic is very complicated and time-consuming, and sometime it is cost and unable to find the reasonable solutions.…”

Section: Nomenclaturementioning

confidence: 99%

Large Eddy Simulation of the Flow-Field around Road Vehicle Subjected to Pitching Motion

Gu¹,

Huang²,

Chen³

et al. 2016

JAFM

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In order to study the aerodynamic responses of a vehicle pitching around its front wheel axle, large eddy simulation (LES) is used to investigate the flow-field around road vehicle. The numerical method is validated by 1/3-scale wind tunnel model on steady state. The LES results keep good agreement with the wind tunnel data. Furthermore, LES is applied to simulate the sinusoidal-pitching motion of vehicle body with frequency 10Hz. It can be found that the aerodynamic force coefficient and flow field changed periodically when the vehicle body takes periodically motion, whose results are completely different from the quasi-steady simulation results. When vehicle body suddenly changes direction, the hysteresis effects of the flow is clearly shown through investigating the transient flow field, aerodynamics force coefficient and pressure coefficient. The hysteresis effects of the transient flow field is also studied by vortices visualization technical, and the transient flow field from space and time is further understood.

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Multi-objective optimization of a hatchback rear end utilizing fractional factorial design algorithm

Beigmoradi

Vahdati

2019

Engineering with Computers

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Forces and flow structures evolution on a car body in a sudden crosswind

Cited by 44 publications

References 25 publications

Time-resolved aerodynamic loads on high-speed trains during running on a tunnel–bridge–tunnel infrastructure under crosswind

Time-resolved aerodynamic loads on high-speed trains during running on a tunnel–bridge–tunnel infrastructure under crosswind

Large Eddy Simulation of the Flow-Field around Road Vehicle Subjected to Pitching Motion

Multi-objective optimization of a hatchback rear end utilizing fractional factorial design algorithm

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