Large Eddy Simulation and Flow Field Analysis of Car on the Bridge under Turbulent Crosswind

Ding, Juyue; Yin, Weitan; Ma, Yunfeng

doi:10.1155/2021/7579696

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…Charuvisit et al [13] assessed the impact of a wind barrier on a vehicle traversing the turbulent airflow generated by a bridge tower in a crosswind. Ding et al [14] utilized a strategy centered on large eddy simulation (LES) to evaluate the characteristics of the flow field and the safety of vehicles on a bridge under the influence of turbulent crosswinds.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Crosswind Speed over the Runway Glide Path Using an Interpretable Local Cascade Ensemble Approach Aided by Wind Tunnel Experiments

Khattak,

Zhang,

Chan

et al. 2023

Atmosphere

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The close proximity of crosswinds to airport runways presents great hazards to landing operations. As a result, an aircraft is susceptible to encountering a loss of control. Elevated levels of turbulence are commonly linked with strong crosswind speeds over the runway glide path. Therefore, it is imperative to evaluate the factors that impact crosswind speeds. The susceptibility of the runways at Hong Kong International Airport (HKIA) to severe crosswinds is well established. This study aimed to build a scaled model of HKIA, along with its surrounding terrain/buildings, within a TJ-3 ABL wind tunnel to compute the crosswind speeds under different wind directions over the runway glide path. Subsequently, utilizing the outcomes of the experiment, a cutting-edge local cascade ensemble (LCE) model was employed in conjunction with a tree-structured Parzen estimator (TPE) to evaluate the crosswind speed over the north runway glide path. The comparative analysis of the TPE-LCE model was also conducted with other machine learning models. The TPE-LCE model demonstrated superior predictive capabilities in comparison to alternative models, as assessed by MAE (0.490), MSE (0.381), RMSE (0.617), and R2 (0.855). The SHAP analysis, which utilized TPE-LCE predictions, revealed that two factors, specifically “Effect of Terrain/Buildings” and “Distance from Runway,” exhibiting noteworthy influence over the probability of encountering elevated crosswind speeds over the runway glide path. The optimal conditions for high-crosswind speeds were found to be characterized by the absence of nearby terrain features or structures, a smaller distance from HKIA’s north runway threshold, and with a wind direction ranging from 125 to 180 degrees.

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Section: Introductionmentioning

confidence: 99%

Assessment of Crosswind Speed over the Runway Glide Path Using an Interpretable Local Cascade Ensemble Approach Aided by Wind Tunnel Experiments

Khattak,

Zhang,

Chan

et al. 2023

Atmosphere

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Large Eddy Simulation of the Flow Past a Soccer Ball

Iftikhar

Sherbaz

Sehole

et al. 2022

Mathematical Problems in Engineering

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The football game is the most popular, played, and loved sport around the world. The advent of technological breakthroughs and the continuous increase in consumer demand have led to a revolution in football’s design and manufacturing process. In the past, studies in soccer ball aerodynamics mainly were limited to the investigation of lift and drag forces inside a wind tunnel apparatus. A few researchers have analyzed the flow around the different soccer balls using computational fluid dynamics simulations with the Reynolds-Averaged-Navier–Stokes equations model. This study primarily intends to simulate a modern soccer ball (Adidas Telstar 18) using the Large Eddy Simulations technique. The whole research is divided into two phases. In the first phase, the flow around a smooth sphere is simulated numerically to validate the meshing strategy, boundary conditions, and solution methodology. The same modeling approach is used in the later stage to simulate the flow around a soccer ball. The effect of panels and seam on the boundary layer flow separation and overall turbulent flow structure around the soccer ball are visualized. The results indicate that the large-eddy simulations help predict the flow intricacies by resolving small eddies near the panels.

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Numerical Simulation of Wind Load on Prefabricated Buildings Using Computational Fluid Dynamics

Li,

Wang

2023

HSET

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At present, the wind tunnel experiment is more and more widely used, but it is rarely used in the construction industry. Therefore, this thesis is to study the wind load of prefabricated buildings by numerical simulation. First, the application field of wind load numerical simulation is analyzed. Next, the numerical model is used to simulate the average wind pressure distribution on the building surface of single tower, tower G and tower F. The turbulence model is established based on fluid mechanics, which makes the obtained data more accurate and can converge quickly. Finally, the wind load interference effects of two fabricated towers and a single tower are analyzed. The experimental results show that the moment coefficient interference factor of tower F remains between 0.696~1.125 and that of tower G remains between 0.291~1.043. When the wind direction angle is 90°, the maximum values of the building base torque and the base bending moment around the X axis appear simultaneously, and the moment around the Y axis is not 0, which will change the stress of the building on the base. If the wind direction angle becomes 0°, the two fabricated towers will interact to reduce the impact on the base moment of the upstream building. Meanwhile, the wind pressure interference factor on the wall surface of prefabricated buildings remains between [-1, 1.5]. When the buildings in the upstream are blocked, the wind pressure interference factor may become 0. However, the shape coefficient of negative pressure on the inner wall of the building will increase rapidly due to the narrow channel effect. This thesis will analyze the wind load on the surface of prefabricated buildings through numerical simulation, which will help the wind engineering team build safer prefabricated buildings.

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Large Eddy Simulation and Flow Field Analysis of Car on the Bridge under Turbulent Crosswind

Cited by 3 publications

References 27 publications

Assessment of Crosswind Speed over the Runway Glide Path Using an Interpretable Local Cascade Ensemble Approach Aided by Wind Tunnel Experiments

Assessment of Crosswind Speed over the Runway Glide Path Using an Interpretable Local Cascade Ensemble Approach Aided by Wind Tunnel Experiments

Large Eddy Simulation of the Flow Past a Soccer Ball

Numerical Simulation of Wind Load on Prefabricated Buildings Using Computational Fluid Dynamics

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