Lower Atmosphere Meteorology

García, M. Ángeles; Pérez, Isidro A.

doi:10.3390/atmos10100609

Cited by 2 publications

(2 citation statements)

References 13 publications

(13 reference statements)

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“…1 3 indicates the filter width. C s = 0.23 was determined by Lilly for homogeneous isotropic turbulence in the inertial sub-area.…”

Section: Smagorinsky-lilly Modelmentioning

confidence: 99%

“…Another challenge concerning street canyons is ventilation and pollutant dispersion, where the latter indicates the transportation of air pollutants through the outdoor atmosphere. In any case, both processes usually take place through the roof level in a street canyon [1,3,4]. Therefore, air quality near street canyons is often indexed as poor and that is why it is a major issue for the inhabitants.…”

Section: Introductionmentioning

confidence: 99%

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Large-Eddy Simulation of Airflow and Pollutant Dispersion in a Model Street Canyon Intersection of Dhaka City

et al. 2022

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The atmospheric flow and dispersion of traffic exhaust were numerically studied in this work while considering a model street canyon intersection of a city. The finite volume method (FVM)-based large-eddy simulation (LES) technique in line with ANSYS Fluent have been used for flow and pollutant dispersion modelling through the consideration of the atmospheric boundary layer (ABL). Hexahedral elements are considered for computational domain discretization in order to numerically solve problems using FVM-LES. The turbulence parameters were superimposed through a spectral synthesizer in the existing LES model through ANSYS Fluent as part of ’damage control’ due to the unsteady k−ϵ simulation. Initially, the code is validated with an experimental study of an urban street canyon where the width and height ratio is in unity. After validation, a model urban street canyon intersection was investigated in this work. The model shows a high pollutant concentration in the intersecting corner areas of the buildings. Additionally, the study of this model intersection shows a high level of pollutant concentration at the leeward wall of downwind building in the case of increased height of an upwind building. Most importantly, it was realized from the street intersection design that three-dimensional interconnection between the dominating canyon vortices and roof level flow plays a pivotal role in pollutant concentration level on the windward walls. The three-dimensional extent of corner eddies and their interconnections with dominating vortices were found to be extremely important as they facilitate enhanced ventilation. Corner eddies only form for the streets towards the freeway and not for the streets towards the intersection. The results and key findings of this work offer qualitative and quantitative data for the estimation, planning, and implementation of exposure mitigation in an urban environment.

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“…1 3 indicates the filter width. C s = 0.23 was determined by Lilly for homogeneous isotropic turbulence in the inertial sub-area.…”

Section: Smagorinsky-lilly Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large-Eddy Simulation of Airflow and Pollutant Dispersion in a Model Street Canyon Intersection of Dhaka City

et al. 2022

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Ambient temperature effect on the imaging quality of an aspherical airborne camera: theoretical and experimental analysis

Tian

Lin

et al. 2021

Appl. Opt.

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The ambient temperature is one of the important factors that affects the imaging quality of aspherical airborne camera. In order to evaluate the imaging quality of an airborne camera under the effect of ambient temperature and predict the influence of the ambient temperature on the modulation transfer function (MTF) of the airborne camera, on the basis of the imaging principle and the material properties of lenses of the airborne camera, this study integrates theoretical analysis, simulation analysis, and experimental tests to study the influence of ambient temperature on the imaging performance of airborne cameras. The imaging performance of an airborne camera is characterized by using the MTF. First, a mathematical model is presented to analyze the effect of ambient temperature on the MTF of the airborne camera. Then the simulation analysis and experiment tests are, respectively, proposed. The results of the mathematical model are compared, respectively, with the results of the simulation analysis and experimental test, and the comparison shows that the variation trends of the mathematical model results are in line with the simulation results and the experimental results, respectively. Therefore, the mathematical model presented in this study is effective for analyzing the influence of ambient temperature variation on the MTF of airborne cameras.

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Lower Atmosphere Meteorology

Abstract: The Atmosphere Special Issue “Lower Atmosphere Meteorology” comprises thirteen original papers dealing with different meteorological processes that occur in the layer of the atmosphere close to the surface and which can greatly affect living beings and materials [...]

Cited by 2 publications

References 13 publications

Large-Eddy Simulation of Airflow and Pollutant Dispersion in a Model Street Canyon Intersection of Dhaka City

Large-Eddy Simulation of Airflow and Pollutant Dispersion in a Model Street Canyon Intersection of Dhaka City

Ambient temperature effect on the imaging quality of an aspherical airborne camera: theoretical and experimental analysis

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