Numerical Simulation of Wind-induced Dispersion of Emissions from Rooftop Stacks PDF Download
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Author: Xiaoguang Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The precise prediction of plume concentration distribution on or near buildings is very important for building engineers to design proper exhaust stacks and set proper air intakes to avoid adverse air quality impacts. The present study simulates the dispersion of emissions from stacks in the neutrally stable atmospheric boundary layer (ABL) by FLUENT 6.1, a commercial computational fluid dynamics (CFD) code. Three case studies have been conducted. The first case involves a simulation of plume dispersion from one isolated stack. The second case is concerned with a simulation of plume dispersion from a flush stack located at the roof center of a cubic building. The third case involves a simulation of plume dispersion from a short stack located on the rooftop of a rectangular building with some rooftop structures. Numerical results are compared with some empirical formulae, such as the Gaussian model and ASHRAE model, and validated with some experimental data. The effects of the momentum ratio, the stack height, and the turbulent characteristics caused by the building on the plume behavior are discussed. Some numerical parametric studies have been carried out.
Author: Xiaoguang Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The precise prediction of plume concentration distribution on or near buildings is very important for building engineers to design proper exhaust stacks and set proper air intakes to avoid adverse air quality impacts. The present study simulates the dispersion of emissions from stacks in the neutrally stable atmospheric boundary layer (ABL) by FLUENT 6.1, a commercial computational fluid dynamics (CFD) code. Three case studies have been conducted. The first case involves a simulation of plume dispersion from one isolated stack. The second case is concerned with a simulation of plume dispersion from a flush stack located at the roof center of a cubic building. The third case involves a simulation of plume dispersion from a short stack located on the rooftop of a rectangular building with some rooftop structures. Numerical results are compared with some empirical formulae, such as the Gaussian model and ASHRAE model, and validated with some experimental data. The effects of the momentum ratio, the stack height, and the turbulent characteristics caused by the building on the plume behavior are discussed. Some numerical parametric studies have been carried out.
Author: Ye Li
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 0
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Book Description
A detailed and comprehensive numerical study of wind-induced pollutant dispersion around buildings has been carried out. Research in this area was reviewed and analyzed. The results from various studies were compared. Based on the review and the comparison with various studies, a more effective methodology for the numerical evaluation of dispersion of pollutants around buildings has been proposed. Computed results of a two-layer approach show various degrees of improvement for the concentration field in the wake region and on the back wall of the building. Results from two-layer approach also show improvement on the building roof for along-wind direction. However, the two-layer approach does not seem to work well for roof concentration along the cross-wind direction; this is probably due to the drawback of the isotropic turbulence model used. The previous numerical studies on pollutant dispersion around rectangular buildings only investigated the concentration profiles for along-wind direction or vertical direction, and these were only for limited situations. A systematic examination of pollutant concentration in the wake of a rectangular building has been carried out for two different release sources. The concentration profiles have been investigated for along-wind, across-wind and vertical directions for various locations. The numerical simulation results have been compared with those from the experiments and from the Modified Gaussian Model. Results from numerical simulation generally agree well with those from the experiments. It was found that the numerical simulation predicts ground level pollutant concentrations better than the Modified Gaussian Model in the near building wake area. The influence of numerical errors on the computed results and the effects of thresholds in the demoralization and convergence process have been investigated for the first time in the area of numerical simulation of pollutant dispersion around buildings.
Author: Charalambos Baniotopoulos
Publisher: Springer Science & Business Media
ISBN: 3709109531
Category : Technology & Engineering
Languages : en
Pages : 353
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Book Description
The book presents a state-of-the-art in environmental aerodynamics and the structural design of wind energy support structures, particularly from a modern computational perspective. Examples include real-life applications dealing with pollutant dispersion in the building environment, pedestrian-level winds, comfort levels, relevant legislation and remedial measures. Design methodologies for wind energy structures include reliability assessment and code frameworks.
Author: Theodore Stathopoulos
Publisher:
ISBN: 9782896312900
Category :
Languages : en
Pages : 71
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Publisher:
ISBN: 9782896312917
Category : Air quality
Languages : en
Pages : 71
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Category :
Languages : en
Pages :
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Category : Dissertations, Academic
Languages : en
Pages : 306
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"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Author: Girma T. Bitsuamlak
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Category :
Languages : en
Pages :
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Category :
Languages : en
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Author: Mauricio Chavez Yanez
Publisher:
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Category :
Languages : en
Pages :
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