Comparison of various types of k–ε models for pollutant emissions around a two-building configuration

Abstract The dispersion of pollutants exhausted from a building roof stack located in a tower was investigated using various types of k–e turbulence models, i.e., a standard k–e model, a RNG k–e model and a realizable k–e model, all implemented using Fluent software. In order to determine the turbulence model that best helped reproduce pollutant plume dispersion, the most critical case was considered, namely, when wind blew perpendicularly towards the upstream tower, then placing the building in its wake. When numerical results were compared to wind tunnel experiments, it was found that the realizable k–e turbulence model yielded the best agreement with wind tunnel results for the lowest stack height, while for the highest stack height, the RNG k–e turbulence model provided greater concordance with experimental results. The realizable k–e model was the only model able to provide the correct trend for the concentration distribution in the lower region between the two buildings; however, none of the models reproduced the trend in the upper regions. The standard k–e model was generally found to be inadequate for reproducing vertical concentration distribution.

[1]  S. Murakami,et al.  COMPARISON OF VARIOUS TURBULENCE MODELS APPLIED TO A BLUFF BODY , 1993 .

[2]  Zhao Zhang,et al.  Evaluation of Various Turbulence Models in Predicting Airflow and 1 Turbulence in Enclosed Environments by CFD : Part-1 : 2 Summary of Prevalent Turbulence Models 3 4 , 2007 .

[3]  T. Shih,et al.  A new k-ϵ eddy viscosity model for high reynolds number turbulent flows , 1995 .

[4]  Fue-Sang Lien,et al.  Simulation of mean flow and turbulence over a 2D building array using high-resolution CFD and a distributed drag force approach , 2004 .

[5]  Theodore Stathopoulos,et al.  Effect of stack height and exhaust velocity on pollutant dispersion in the wake of a building , 2011 .

[6]  Yoshihiko Hayashi,et al.  Numerical simulation of velocity field and diffusion field in an urban area , 1990 .

[7]  Mohamed F. Yassin,et al.  Impact of street intersections on air quality in an urban environment , 2008 .

[8]  Xiaoguang Wang.  Numerical simulation of wind-induced dispersion of emissions from rooftop stacks , 2006 .

[9]  Theodore Stathopoulos,et al.  Effects of model scale in estimating pollutant dispersion near buildings , 1995 .

[10]  Robert N. Meroney,et al.  Gas dispersion near a cubical model building. Part I. Mean concentration measurements , 1983 .

[11]  U. Ghia,et al.  Procedure for Estimation and Reporting of Uncertainty Due to Discretization in CFD Applications , 2007 .

[12]  D. Spalding,et al.  A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows , 1972 .

[13]  Shuzo Murakami,et al.  Overview of turbulence models applied in CWE–1997 , 1998 .

[14]  Theodore Stathopoulos,et al.  Near-field pollutant dispersion in the built environment by CFD and wind tunnel simulations , 2011 .

[15]  B. Blocken,et al.  Pollutant dispersion around isolated buildings: on the prediction of convective and turbulent mass fluxes by LES and RANS , 2011 .

[16]  W. Jones,et al.  The prediction of laminarization with a two-equation model of turbulence , 1972 .

[17]  Robert N. Meroney,et al.  Concentration and flow distributions in urban street canyons: wind tunnel and computational data , 2003 .

[18]  D. Grawe,et al.  BEST PRACTICE GUIDELINE FOR THE CFD SIMULATION OF FLOWS IN THE URBAN ENVIRONMENT , 2007 .

[19]  Theodore Stathopoulos,et al.  The effect of upstream buildings on near-field pollutant dispersion in the built environment , 2011 .

[20]  Robert N. Meroney,et al.  Gas dispersion near a cubical model building. Part II. Concentration fluctuation measurements , 1983 .

[21]  Yoshihide Tominaga,et al.  AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings , 2008 .

[22]  Rex Britter,et al.  Simulations of pollutant dispersion within idealised urban-type geometries with CFD and integral models , 2007 .

[23]  Michael Schatzmann,et al.  Wind-tunnel and numerical modeling of flow and dispersion about several building shapes , 1999 .

[24]  Theodore Stathopoulos,et al.  Numerical evaluation of wind-induced dispersion of pollutants around a building , 1997 .

[25]  W. Rodi.  Comparison of LES and RANS calculations of the flow around bluff bodies , 1997 .

[26]  Catherine Gorle,et al.  Stack gas dispersion measurements with large-scale PIV, aspiration probes and light scattering techniques and comparison with CFD , 2009 .

[27]  Riccardo Buccolieri,et al.  Numerical simulation of atmospheric pollutant dispersion in an urban street canyon: Comparison between RANS and LES , 2011 .

[28]  Bert Blocken,et al.  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 , 2011 .

[29]  Yoshihide Tominaga,et al.  Numerical simulation of dispersion around an isolated cubic building: Comparison of various types of k–ɛ models , 2009 .

[30]  S. Orszag,et al.  Development of turbulence models for shear flows by a double expansion technique , 1992 .

[31]  Mats Sandberg,et al.  The influence of building height variability on pollutant dispersion and pedestrian ventilation in idealized high-rise urban areas , 2012 .

[32]  Refrigerating.  1993 ASHRAE handbook : fundamentals , 1993 .

[33]  Fue-Sang Lien,et al.  Progress and challenges in the development of physically-based numerical models for prediction of flow and contaminant dispersion in the urban environment , 2006 .

[34]  Y. Tominaga,et al.  Numerical simulation of dispersion around an isolated cubic building: Model evaluation of RANS and LES , 2010 .

[35]  Richard Griffiths,et al.  Field and wind tunnel investigations of plume dispersion around single surface obstacles , 2003 .

[36]  Theodore Stathopoulos,et al.  Application of computational fluid dynamics in building performance simulation for the outdoor environment: an overview , 2011 .

[37]  Theodore Stathopoulos,et al.  A wind tunnel study of the effect of downstream buildings on near-field pollutant dispersion , 2012 .

[38]  Helen ApSimon,et al.  A numerical study of atmospheric pollutant dispersion in different two-dimensional street canyon configurations , 2003 .

[39]  Elisa Canepa,et al.  An overview about the study of downwash effects on dispersion of airborne pollutants , 2004, Environ. Model. Softw..

[40]  M. Nallasamy,et al.  Turbulence models and their applications to the prediction of internal flows: a review , 1987 .

[41]  Theodore Stathopoulos,et al.  Influence of turbulence models on pollutant dispersion studies around a building complex , 2010 .

[42]  Koichi Sada,et al.  Numerical calculation of flow and stack-gas concentration fluctuation around a cubical building , 2002 .

[43]  Yoshihide Tominaga,et al.  Turbulent Schmidt numbers for CFD analysis with various types of flowfield , 2007 .

[44]  Alan Robins,et al.  Effects of Reynolds number on stack plume trajectories simulated with small scale models in a wind tunnel , 2009 .

[45]  N. G. Wright,et al.  Non-linear k–ε turbulence model results for flow over a building at full-scale , 2003 .

[46]  J. Lumley,et al.  A new Reynolds stress algebraic equation model , 1994 .

[47]  Theodore Stathopoulos,et al.  Numerical simulation of pollutant dispersion around a building complex , 2010 .

[48]  Chang Nyung Kim,et al.  Numerical Investigation of Indoor CO2 Concentration Distribution in an Apartment , 2011 .

[49]  K. Kwok,et al.  A Hybrid RANS and Kinematic Simulation of Wind Load Effects on Full-Scale Tall Buildings , 2011 .

[50]  Dennis Y.C. Leung,et al.  Characteristics of air exchange in a street canyon with ground heating , 2006 .

[51]  Ryozo Ooka,et al.  CFD analysis of pollutant dispersion around buildings: Effect of cell geometry , 2009 .

[52]  Marcos S. P. Gomes,et al.  Wind tunnel investigation on the retention of air pollutants in three-dimensional recirculation zones in urban areas , 2007 .

[53]  Theodore Stathopoulos,et al.  Numerical evaluation of pollutant dispersion in the built environment: comparisons between models and experiments , 2008 .

[54]  T. Stathopoulos,et al.  CFD simulation of the atmospheric boundary layer: wall function problems , 2007 .

[55]  Zhen Huang,et al.  Impact of building configuration on air quality in street canyon , 2005 .

[56]  Yan Yang,et al.  Numerical simulations of flow and pollution dispersion in urban atmospheric boundary layers , 2008, Environ. Model. Softw..