Improvement of the vertical mixing in chemistry transport modeling based on a 1.5-order turbulence kinetic energy-based eddy diffusivity closure scheme

Jiang, Lei; Bessagnet, Bertrand; Meleux, Frédérik; Couvidat, Florian; Tognet, Frédéric

doi:10.1016/j.atmosres.2022.106394

Cited by 2 publications

(1 citation statement)

References 47 publications

(54 reference statements)

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“…The turbulence statistical method can be expressed as a random variable V(x, t) in which the velocity field is considered position and time [8]. Using the traversal hypothesis, one can obtain microcanonical probability measure…”

Section: Turbulence As a Statistical Theorymentioning

confidence: 99%

Air Dynamic Stability of Airfoils in Lift-Type Vertical Axis Wind Turbine by Measuring Turbulence

Qian,

Li,

Xia

et al. 2023

Advances in Transdisciplinary Engineering

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Stability might be the other important target besides power efficiency. At this work, we focus on examining air dynamic stability of vertical axis wind turbine (VAWT). While our aim is on stability, we will consider it in instability aspect, specifically by measuring turbulence. The quantities are including turbulence kinetic energy, intensity, dissipation and production. Three representative airfoils have been selected, which are NACA0012, NACA23012 and NACA2412. The turbulence generated around these airfoils would be compared at different stages of running, at TSR of 0, 2, 5 and 7. Every position of the airfoil is taken into account, 360 degrees with interval of 5. Here we will apply static analysis instead of transient one because we attempt to eliminate some other effect of air flow in the meantime acquiring higher computation accuracy. At first, we would scrutinize some fundamental principles of turbulence theory. The theory is based on the structure of statistics. Unfolded, there is the kinetic energy equation that leads to the basic quantities mentioned above. Each quantity has certain meaning and role in turbulence. Then we will resent the computation method and results.

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Section: Turbulence As a Statistical Theorymentioning

confidence: 99%

Air Dynamic Stability of Airfoils in Lift-Type Vertical Axis Wind Turbine by Measuring Turbulence

Qian,

Li,

Xia

et al. 2023

Advances in Transdisciplinary Engineering

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Observed Vertical Dispersion Patterns of Particulate Matter in Urban Street Canyons and Dominant Influencing Factors

Wang,

Chen,

et al. 2024

Forests

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When developing strategies aimed at mitigating air pollution in densely populated urban areas, it is vital to accurately investigate the vertical distribution of airborne particulate matter (PM) and its primary influencing factors. For this study, field experiments were conducted to quantify the vertical distribution and dispersion processes of PM at five vertical heights related to trees—including at street level near vehicular emission sources (0.3 m), pedestrian breathing height (1.5 m), beneath the canopy (6 m), mid-canopy (9 m), and the top of the canopy (12 m)—within a street-facing building in Wuhan, China. Comparing the vertical dispersion patterns of PM with six particle sizes (PM1, PM2.5, PM4, PM7, PM10, and total suspended particulates—TSPs), larger particles exhibited more pronounced variations with height, notably TSPs (correlation coefficient of −0.95) and PM10 (−0.84). The findings consistently revealed a downward trend in PM concentrations across various particle sizes with increasing height, indicating a negative linear correlation between particle concentrations and altitude within the street canyon. For every 1% increase in vertical height, the PM2.5 concentration decreased by approximately 5.44%, the PM10 concentration decreased by 132.1%, and the TSP concentration decreased by 180.6%. These findings show potential for guiding building designers in developing effective strategies, such as optimal vent placement, in order to mitigate the intrusion of outdoor air pollution—particularly PM2.5—into indoor environments. Furthermore, this research provides novel insights for residents living in street-facing buildings and individuals with respiratory diseases, aiding them in the selection of residential floors to minimize health risks associated with exposure to respirable PM.

show abstract

Improvement of the vertical mixing in chemistry transport modeling based on a 1.5-order turbulence kinetic energy-based eddy diffusivity closure scheme

Cited by 2 publications

References 47 publications

Air Dynamic Stability of Airfoils in Lift-Type Vertical Axis Wind Turbine by Measuring Turbulence

Air Dynamic Stability of Airfoils in Lift-Type Vertical Axis Wind Turbine by Measuring Turbulence

Observed Vertical Dispersion Patterns of Particulate Matter in Urban Street Canyons and Dominant Influencing Factors

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