Large eddy simulation of wind field and plume dispersion in building array

Shi, Rui-Feng; Cui, Guixiang; Wang, Z.S.; Xu, Chunxiao; Zhang, Z.S.

doi:10.1016/j.atmosenv.2007.10.071

Cited by 43 publications

(29 citation statements)

References 21 publications

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“…Chan et al, 2002;Gromke et al, 2008) or regular building groups (e.g. Kim and Baik, 2004;Shi et al, 2008;Wang et al, 2009;Buccolieri et al, 2010;Dejoan et al, 2010). Applied studies refer to actual (isolated) buildings or actual building groups (urban areas) (e.g.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of near-field pollutant dispersion on a high-resolution grid: A case study by LES and RANS for a building group in downtown Montreal

Gousseau¹,

Blocken²,

Stathopoulos³

et al. 2011

Atmospheric Environment

319

148

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Turbulence modeling and validation by experiments are key issues in the simulation of micro-scale atmospheric dispersion. This study evaluates the performance of two different modeling approaches (RANS standard k-ε and LES) applied to pollutant dispersion in an actual urban environment: downtown Montreal. The focus of the study is on near-field dispersion, i.e. both on the prediction of pollutant concentrations in the surrounding streets (for pedestrian outdoor air quality) and on building surfaces (for ventilation system inlets and indoor air quality). The high-resolution CFD simulations are performed for neutral atmospheric conditions and are validated by detailed wind-tunnel experiments. A suitable resolution of the computational grid is determined by grid-sensitivity analysis. It is shown that the performance of the standard k-ε model strongly depends on the turbulent Schmidt number, whose optimum value is case-dependent and a priori unknown. In contrast, LES with the dynamic subgrid-scale model shows a better performance without requiring any parameter input to solve the dispersion equation.

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Section: Introductionmentioning

confidence: 99%

CFD simulation of near-field pollutant dispersion on a high-resolution grid: A case study by LES and RANS for a building group in downtown Montreal

Gousseau¹,

Blocken²,

Stathopoulos³

et al. 2011

Atmospheric Environment

319

148

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show abstract

“…As concerns gas dispersions in confined or semi-confined areas, CFD tools have been largely applied to describe neutrally buoyant pollutant dispersions inside urban canopies, using both RANS [12][13][14][15] and Large Eddy Simulations [16,17], or to assess a building canopy model for urban climate planning [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Modeling and simulation of dense cloud dispersion in urban areas by means of computational fluid dynamics

Scargiali

Grisafi

Busciglio

et al. 2011

Journal of Hazardous Materials

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a b s t r a c tThe formation of toxic heavy clouds as a result of sudden accidental releases from mobile containers, such as road tankers or railway tank cars, may occur inside urban areas so the problem arises of their consequences evaluation.Due to the semi-confined nature of the dispersion site simplified models may often be inappropriate.As an alternative, computational fluid dynamics (CFD) has the potential to provide realistic simulations even for geometrically complex scenarios since the heavy gas dispersion process is described by basic conservation equations with a reduced number of approximations.In the present work a commercial general purpose CFD code (CFX 4.4 by Ansys ® ) is employed for the simulation of dense cloud dispersion in urban areas. The simulation strategy proposed involves a stationary pre-release flow field simulation followed by a dynamic after-release flow and concentration field simulations.In order to try a generalization of results, the computational domain is modeled as a simple network of straight roads with regularly distributed blocks mimicking the buildings. Results show that the presence of buildings lower concentration maxima and enlarge the side spread of the cloud. Dispersion dynamics is also found to be strongly affected by the quantity of heavy-gas released.

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“…Shi et al [17] performed LESs of plume dispersion within a cubic building array with a resolution of five to six grids across individual obstacle and mentioned that the mean velocity and concentration distribution profiles are successfully simulated in comparison to wind tunnel experimental data. Thus, the resolution of four grids across obstacles is still considered sufficient for representing basic turbulent behaviors around individual buildings.…”

Section: Computational Settingsmentioning

confidence: 99%

Development of local-scale high-resolution atmospheric dispersion model using large-eddy simulation. Part 4: turbulent flows and plume dispersion in an actual urban area

Nakayama

Leitl

Harms

et al. 2014

Journal of Nuclear Science and Technology

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We have developed a local-scale high-resolution atmospheric dispersion model using large-eddy simulation (LOHDIM-LES) to assess the safety at nuclear facilities and to respond to emergency situations resulting from accidental or deliberate releases of radioactive materials (e.g., a terrorist attack in an urban area). In Part 1, the unsteady behavior of a plume dispersing over a flat terrain was successfully simulated. In Parts 2 and 3, LESs of turbulent flows and plume dispersion around an isolated building and in building arrays with different obstacle densities were performed, which showed the basic performance comparable to wind tunnel experimental technique. In this study, we apply the LES model to turbulent flows and plume dispersion in an actual urban area. Although some of the turbulence and dispersion characteristics are quantitatively different from the wind tunnel experimental data, the distribution patterns are generally similar to those of the experiments. It is concluded that our LES model simulates reasonably the unsteady behavior of turbulent flows and plume dispersion even for complex heterogeneous urban areas.

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Large eddy simulation of wind field and plume dispersion in building array

Cited by 43 publications

References 21 publications

CFD simulation of near-field pollutant dispersion on a high-resolution grid: A case study by LES and RANS for a building group in downtown Montreal

CFD simulation of near-field pollutant dispersion on a high-resolution grid: A case study by LES and RANS for a building group in downtown Montreal

Modeling and simulation of dense cloud dispersion in urban areas by means of computational fluid dynamics

Development of local-scale high-resolution atmospheric dispersion model using large-eddy simulation. Part 4: turbulent flows and plume dispersion in an actual urban area

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