A comparison of contaminant plume statistics from a Gaussian puff and urban CFD model for two large cities

Pullen, Julie; Boris, J. P.; Young, T. R.; Patnaik, Gopal; Iselin, John P.

doi:10.1016/j.atmosenv.2004.10.043

Cited by 57 publications

(23 citation statements)

References 14 publications

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“…An excellent agreement with temperature measurements can be achieved by using fine tuned subgrid-scale surface parameterizations (Kinouchi and Yoshitani 2001); however, these models still do not allow the exact analyses of contaminant transport in an urban atmosphere as local emission levels are strongly dependent on fine flow structures such as urban canyon effects, building-specific lofting, and eddies in the wakes of buildings (Pullen et al 2005).…”

mentioning

confidence: 98%

Adaptation of Pressure Based CFD Solvers for Mesoscale Atmospheric Problems

Kristóf

Rácz

Balogh

2008

Boundary-Layer Meteorol

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General purpose Computational Fluid Dynamics (CFD) solvers are frequently used in small-scale urban pollution dispersion simulations without a large extent of vertical flow. Vertical flow, however, plays an important role in the formation of local breezes, such as urban heat island induced breezes that have great significance in the ventilation of large cities. The effects of atmospheric stratification, anelasticity and Coriolis force must be taken into account in such simulations. We introduce a general method for adapting pressure based CFD solvers to atmospheric flow simulations in order to take advantage of their high flexibility in geometrical modelling and meshing. Compressibility and thermal stratification effects are taken into account by utilizing a novel system of transformations of the field variables and by adding consequential source terms to the model equations of incompressible flow. Phenomena involving mesoscale to microscale coupled effects can be analyzed without model nesting, applying only local grid refinement of an arbitrary level. Elements of the method are validated against an analytical solution, results of a reference calculation, and a laboratory scale urban heat island circulation experiment. The new approach can be applied with benefits to several areas of application. Inclusion of the moisture transport phenomena and the surface energy balance are important further steps towards the practical application of the method.

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confidence: 98%

Adaptation of Pressure Based CFD Solvers for Mesoscale Atmospheric Problems

Kristóf

Rácz

Balogh

2008

Boundary-Layer Meteorol

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“…While "on demand" CFD calculations are not practical for these applications, there are a number of research groups investigating the use of computational fluid dynamics (CFD) models for fast response applications. Ideas range from coarse resolution simulations using drag [13,38] to library approaches where a large number of cases are pre-computed and results for specific cases are interpolated from the library [46,54].…”

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confidence: 99%

Evaluation of the QUIC-URB fast response urban wind model for a cubical building array and wide building street canyon

et al. 2008

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This paper describes the QUIC-URB fast response urban wind modeling tool and evaluates it against wind tunnel data for a 7 × 11 cubical building array and wide building street canyon. QUIC-URB is based on the Röckle diagnostic wind modeling strategy that rapidly produces spatially resolved wind fields in urban areas and can be used to drive urban dispersion models. Röckle-type models do not solve transport equations for momentum or energy; rather, they rely heavily on empirical parameterizations and mass conservation. In the model-experiment comparisons, we test two empirical building flow parameterizations within the QUIC-URB model: our implementation of the standard Röckle (SR) algorithms and a set of modified Röckle (MR) algorithms. The MR model attempts to build on the strengths of the SR model and introduces additional physically based, but simple parameterizations that significantly improve the results in most regions of the flow for both test cases. The MR model produces vortices in front of buildings, on rooftops and within street canyons that have velocities that compare much more favorably to the experimental results. We expect that these improvements in the wind field will result in improved dispersion calculations in built environments.

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“…Actually, OPANA V4 includes a sophisticated CFD code (based on the MIMO model (University of Karlsruhe (Germany), 1996; Moussiopoulos et al 2005;Pullen et al 2005;Pospisil et al 2004;Ehrhard et al 2000)) which runs in diagnostic mode over a 1× 1-km model domain over highly dense populated areas in cities (Madrid, Las Palmas de Gran Canaria, etc.). The CFD code is called MICROSYS (San José et al 2007a, b) and has a resolution of 1-10 m, receiving traffic emission data from a sophisticated cellular automata model (CAMO)-developed also by the ESMG-FI-UPM (San José et al 2007a, b).…”

Section: Application and Resultsmentioning

confidence: 99%

The Use of Modern Third-Generation Air Quality Models (MM5-EMIMO-CMAQ) for Real-Time Operational Air Quality Impact Assessment of Industrial Plants

José

Pérez

Morant

et al. 2009

Water Air Soil Pollut: Focus

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In many cases, a substantial proportion of large industrial emissions are located in the surrounding areas of cities and are the cause of an important part of air concentrations over the city and surrounding areas. The need to have a tool to analyze and manage these concentrations is the main objective of this contribution. In this paper, we show the implementation of an adapted version of the MM5-CMAQ (Byun et al. 1998, Description of the Models-3 Community Multiscale Air Quality (CMAQ) model.

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A comparison of contaminant plume statistics from a Gaussian puff and urban CFD model for two large cities

Cited by 57 publications

References 14 publications

Adaptation of Pressure Based CFD Solvers for Mesoscale Atmospheric Problems

Adaptation of Pressure Based CFD Solvers for Mesoscale Atmospheric Problems

Evaluation of the QUIC-URB fast response urban wind model for a cubical building array and wide building street canyon

The Use of Modern Third-Generation Air Quality Models (MM5-EMIMO-CMAQ) for Real-Time Operational Air Quality Impact Assessment of Industrial Plants

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