EXP 1-2 Introduction: Difference between revisions
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= Introduction = | = Introduction = | ||
The aim of the presented wind tunnel experiment was to investigate the transport of pollutants from a ground-level line source through the openings of a street canyon by means of turbulence and advection. The main influencing variables were the roof height along the street canyon walls and the wind direction. The experiment was conducted at a scale of 1:400 and with a flow regime independent of the Reynolds number in order to be transferable to the full scale. | The aim of the presented wind tunnel experiment was to investigate the transport of pollutants from a ground-level line source through the openings of a street canyon by means of turbulence and advection. The main influencing variables were the roof height along the street canyon walls and the wind direction. The experiment was conducted at a scale of 1:400 and with a flow regime independent of the Reynolds number in order to be transferable to the full scale. | ||
Because of the non-uniform roof heights, the flow and pollutant transport were measured in two horizontal planes: at the height of the city model with uniform roof heights (corresponding to the mean height of the model with the non-uniform roof heights) and at the height corresponding to the lowest roof height of the non-uniform case. Due to the three-dimensionality of the problem, the flow and pollutant transport were also measured at the two lateral openings of the studied street canyons. | Because of the non-uniform roof heights, the flow and pollutant transport were measured in two horizontal planes: at the height of the city model with uniform roof heights (corresponding to the mean height of the model with the non-uniform roof heights) and at the height corresponding to the lowest roof height of the non-uniform case. Due to the three-dimensionality of the problem, the flow and pollutant transport were also measured at the two lateral openings of the studied street canyons. | ||
The measurement of the turbulent pollutant fluxes through the respective opening also provides the mean (advective) pollutant fluxes and velocity vector statistics as mean momentum fluxes (Reynolds stresses) and mean velocity values. The pollutant concentration statistics are also provided. | The measurement of the turbulent pollutant fluxes through the respective opening also provides the mean (advective) pollutant fluxes and velocity vector statistics as mean momentum fluxes (Reynolds stresses) and mean velocity values. The pollutant concentration statistics are also provided. | ||
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Revision as of 14:11, 3 May 2023
Pollutant transport between a street canyon and a 3D urban array as a function of wind direction and roof height non-uniformity
Introduction
The aim of the presented wind tunnel experiment was to investigate the transport of pollutants from a ground-level line source through the openings of a street canyon by means of turbulence and advection. The main influencing variables were the roof height along the street canyon walls and the wind direction. The experiment was conducted at a scale of 1:400 and with a flow regime independent of the Reynolds number in order to be transferable to the full scale.
Because of the non-uniform roof heights, the flow and pollutant transport were measured in two horizontal planes: at the height of the city model with uniform roof heights (corresponding to the mean height of the model with the non-uniform roof heights) and at the height corresponding to the lowest roof height of the non-uniform case. Due to the three-dimensionality of the problem, the flow and pollutant transport were also measured at the two lateral openings of the studied street canyons.
The measurement of the turbulent pollutant fluxes through the respective opening also provides the mean (advective) pollutant fluxes and velocity vector statistics as mean momentum fluxes (Reynolds stresses) and mean velocity values. The pollutant concentration statistics are also provided.
Contributed by: Štěpán Nosek — Institute of Thermomechanics of the CAS, v. v. i.
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