Accelerating flow simulations in the built environment by using the fast fluid dynamics initializer

Zhang, Chi; Wen, Chih-Yung; Juan, Yu-Hsuan; Lee, Yee-Ting; Chen, Zhengwei; Yang, An-Shik; Li, Zhengtong

doi:10.1016/j.buildenv.2024.111274

Building and Environment

2024

DOI: 10.1016/j.buildenv.2024.111274

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Accelerating flow simulations in the built environment by using the fast fluid dynamics initializer

Chi Zhang,

Chih-Yung Wen,

Yu-Hsuan Juan

et al.

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2024

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Cited by 2 publications

References 77 publications

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Wind characteristics around a skyway bridge of high-rise buildings

Chen,

Su,

Juan

2024

Physics of Fluids

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To respond the expansion of urban centers, the proliferation of high-rise buildings demands a better understanding of the aerodynamic phenomena around skyway bridges connecting these structures. This analysis, utilizing the advanced computational fluid dynamics verified by wind tunnel test data, investigates the wind characteristics around such bridges, crucial for structural stability, pedestrian comfort, and aerodynamic efficiency. This study focuses on the interactions between a 2 × 2 building array with a building height-to-street width ratio of 30 and a skyway bridge, investigating those factors such as bridge influence, building structures, building height, and bridge position. Using the three-dimensional steady Reynolds-averaged Navier–Stokes equations along with the Reynolds stress model for turbulence closure, the results show that the presence of skyway bridge significantly modifies local wind patterns. Wind speed and turbulence intensity are impacted differently based on the bridge's upstream or downstream settings. Downstream bridges tend to reduce wind speeds due to the sheltering effects, while upstream placement of bridge can enhance wind flow, affecting both the structural design and pedestrian comfort. Additionally, building height variations adjacent to the bridge influence wind velocity and pressure profiles, with taller buildings intensifying wind speeds at lower levels because of the channeling effects. These insights are pivotal for optimizing the skyway bridge designs to improve airflow distribution, enhance environmental sustainability, and ease wind-caused disturbances, offering a guideline for future architectural and urban planning in high-rise districts.

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Wind characteristics around a skyway bridge of high-rise buildings

Chen,

Su,

Juan

2024

Physics of Fluids

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Numerical simulation of three physical fields in counter‐current ultrasound

Li,

Ma,

et al. 2024

J Food Process Engineering

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Power ultrasound is a kind of green and environmentally friendly processing technology. Still, because of its uneven distribution of acoustic pressure in the propagation medium, the large‐scale industrial application of ultrasound is limited. In order to make more effective use of ultrasound waves, this paper uses a counter‐current ultrasound‐assisted extraction container as the geometric model of simulation, calculates the distribution of the acoustic pressure field in the container by COMSOL Multiphysics software, and investigates the effect of acoustic pressure on the fluid field, and temperature field. The simulation results showed that the acoustic pressure increased with the increase of ultrasound power and frequency, tended to balance with the rise of propagation distance, and the cavitation effect was more likely to occur. The propagation of ultrasound in the fluid medium increased the velocity and vorticity of the fluid, which was conducive to the generation of mixing effects. Under the ultrasound pulse working mode for 4 min, the fluid temperature on the central axis increased in a stepped order, with a maximum increase of 19.3°C. We can see that the establishment of the simulation model provides some theoretical guidance for the more practical application of ultrasound in the food industry.Practical ApplicationsThe limitation of ultrasound application mainly lies in the nonuniform distribution of acoustic pressure when ultrasound propagates in the fluid medium. Therefore, mastering the distribution of multiple physical fields in the reaction zone through simulation has important technical support and theoretical guiding significance for designing efficient ultrasound‐assisted extraction equipment and large‐scale industrial production of ultrasound.

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Accelerating flow simulations in the built environment by using the fast fluid dynamics initializer

Cited by 2 publications

References 77 publications

Wind characteristics around a skyway bridge of high-rise buildings

Wind characteristics around a skyway bridge of high-rise buildings

Numerical simulation of three physical fields in counter‐current ultrasound

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