Measurement-driven Large Eddy Simulation of dispersion in street canyons of variable building height
| Autor: | Márton Balczó, Márton Koren, Balázs Istók, Miklós Balogh, Gergely Kristóf, Bálint Papp |
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| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
Renewable Energy Sustainability and the Environment Turbulence Mechanical Engineering Magnitude (mathematics) Mechanics Wind direction 01 natural sciences 010305 fluids & plasmas Eddy 0103 physical sciences Environmental science Transient (oscillation) Dispersion (water waves) 0105 earth and related environmental sciences Civil and Structural Engineering Large eddy simulation Wind tunnel |
| Zdroj: | Journal of Wind Engineering and Industrial Aerodynamics. 211:104495 |
| ISSN: | 0167-6105 |
| Popis: | The ventilation efficiency of three periodic building patterns of equal total volume and packing density is investigated: street canyons bounded by H uniform and 0.5H/1.5H variable height buildings, via wind tunnel measurements and Large Eddy Simulation. The numerical model utilizes the Transient Wind Forcing method to take the effect of eddies larger than the domain size into account, and a special Lagrangian dispersion model, which allows for the calculation of particle trajectories exceeding the periodic boundaries of the LES domain. The spatial and temporal characteristics of the concentration responses of both pulse-like and steady point sources located at the street surfaces are analyzed. It is shown that the variable building height has a favorable effect on urban ventilation in densely built areas: the average near-ground concentration can be reduced by up to 70% for the variable height buildings in a staggered arrangement. In terms of velocity, turbulence and concentration distributions, the model results are consistent with the experiments, verifying the applicability of the model for comparative air quality studies. Since the presented dispersion model is capable of handling dynamic changes in wind direction and magnitude, the accuracy of the TWF model can potentially overcome the limitations of wind tunnel tests. |
| Databáze: | OpenAIRE |
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