CFD simulations of the effect of evaporative cooling from water bodies in a micro-scale urban environment: Validation and application studies

Abstract Computational fluid dynamics (CFD) simulations of the evaporative cooling effect from water surfaces in a micro-scale urban environment were evaluated via validation and application studies with various configurations. First, the basic ability of CFD simulations to reproduce the evaporative cooling on a simplified small-scale water surface in a boundary layer was investigated. Next, the prediction accuracy of the vapor transport mechanism from a water surface within an array of building was evaluated. It was confirmed that the vapor transport mechanism influenced by the complex wind flow around buildings could be reproduced by the current CFD code within a given accuracy. Finally, a numerical analysis that combined CFD and radiative heat transfer analysis was conducted for predicting the thermal environment around an actual residential neighborhood with a pond. The results were compared to experimental data. The experimental air temperature distribution around the pond was qualitatively reproduced via CFD. The maximum temperature decrease induced by the water surface was approximately 2 °C at the pedestrian level. For a wind velocity of approximately 3 m/s at a height of 10 m, the effect of the evaporative cooling propagates downwind over an unobstructed distance of 100 m.

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

[2]  R. Ooka,et al.  Study on mitigation measures for outdoor thermal environment on present urban blocks in Tokyo using coupled simulation , 2009 .

[3]  Bje Bert Blocken,et al.  On the effect of wind direction and urban surroundings on natural ventilation of a large semi-enclosed stadium , 2010 .

[4]  Guangming Li,et al.  Evaluation of human thermal comfort near urban waterbody during summer , 2010 .

[5]  Akashi Mochida,et al.  Prediction of wind environment and thermal comfort at pedestrian level in urban area , 2006 .

[6]  A. Pullin,et al.  Urban greening to cool towns and cities: a systematic review of the empirical evidence. , 2010 .

[7]  Claire L. Smith,et al.  Designing urban spaces and buildings to improve sustainability and quality of life in a warmer world , 2008 .

[8]  K. Narita,et al.  Study of the effects of a river on the thermal environment in an urban area , 1991 .

[9]  P. Richards,et al.  Appropriate boundary conditions for computational wind engineering models using the k-ε turbulence model , 1993 .

[10]  H. Akbari,et al.  Cool surfaces and shade trees to reduce energy use and improve air quality in urban areas , 2001 .

[11]  G. Steeneveld,et al.  Refreshing the role of open water surfaces on mitigating the maximum urban heat island effect , 2014 .

[12]  D. Groleau,et al.  Modeling the influence of vegetation and water pond on urban microclimate , 2006 .

[13]  Bje Bert Blocken,et al.  Pedestrian wind comfort around buildings : comparison of wind comfort criteria based on whole-flow field data for a complex case study , 2013 .

[14]  Servando Álvarez Domínguez,et al.  Modelling microclimate in urban environments and assessing its influence on the performance of surrounding buildings , 2004 .

[15]  T. Oke.  The energetic basis of the urban heat island , 1982 .

[16]  B. Launder,et al.  The numerical computation of turbulent flows , 1990 .

[17]  Bert Blocken,et al.  Coupled urban wind flow and indoor natural ventilation modelling on a high-resolution grid: A case study for the Amsterdam ArenA stadium , 2010, Environ. Model. Softw..

[18]  B. Givoni.  Impact of planted areas on urban environmental quality: A review , 1991 .

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

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

[21]  Nobuya Nishimura,et al.  NOVEL WATER FACILITIES FOR CREATION OF COMFORTABLE URBAN MICROMETEOROLOGY , 1998 .

[22]  Jörg Franke,et al.  The COST 732 Best Practice Guideline for CFD simulation of flows in the urban environment: a summary , 2011 .

[23]  E. A. Hathway,et al.  The interaction of rivers and urban form in mitigating the Urban Heat Island effect: A UK case study , 2012 .

[24]  A. Arnfield.  Two decades of urban climate research: a review of turbulence, exchanges of energy and water, and the urban heat island , 2003 .

[25]  R. Granger,et al.  Modelling hourly rates of evaporation from small lakes , 2011 .

[26]  Lisette Klok,et al.  The surface heat island of Rotterdam and its relationship with urban surface characteristics , 2012 .

[27]  Ranhao Sun,et al.  How can urban water bodies be designed for climate adaptation , 2012 .

[28]  H Hamid Montazeri,et al.  CFD evaluation of new second-skin facade concept for wind comfort on building balconies : case-study for the Park Tower in Antwerp , 2013 .

[29]  F. Haghighat,et al.  Approaches to study Urban Heat Island – Abilities and limitations , 2010 .

[30]  Hamid Montazeri,et al.  CFD simulation and validation of urban microclimate: A case study for Bergpolder Zuid, Rotterdam , 2015 .

[31]  G. Steeneveld,et al.  Modeling the influence of open water surfaces on the summertime temperature and thermal comfort in the city , 2013 .

[32]  William H. Snyder,et al.  The critical Reynolds number for rough-wall boundary layers , 2002 .

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

[34]  Yoshihide Tominaga,et al.  CFD Simulation of Near-Field Pollutant Dispersion in the Urban Environment: A Review of Current Modeling Techniques , 2013 .

[35]  Zheng-Tong Xie,et al.  Large-eddy simulation for flow and dispersion in urban streets , 2009 .

[36]  P. Schuepp,et al.  The effects of small water bodies on the atmospheric heat and water budgets over the MacKenzie River Basin , 2004 .

[37]  M. Bruse,et al.  Simulating surface–plant–air interactions inside urban environments with a three dimensional numerical model , 1998 .

[38]  Akira Hoyano,et al.  Experimental study of cooling effects of a passive evaporative cooling wall constructed of porous ceramics with high water soaking-up ability , 2010 .

[39]  Borong Lin,et al.  Numerical simulation studies of the different vegetation patterns' effects on outdoor pedestrian thermal comfort , 2006 .

[40]  Yoshihide Tominaga,et al.  CFD Modeling of Pollution Dispersion in Building Array: Evaluation of turbulent scalar flux modeling in RANS model using LES results , 2012 .

[41]  T. Oke,et al.  An evapotranspiration‐interception model for urban areas , 1991 .

[42]  H. Timmermans,et al.  CFD analysis of transpirational cooling by vegetation: Case study for specific meteorological conditions during a heat wave in Arnhem, Netherlands , 2015 .

[43]  J. Carmeliet,et al.  Coupled CFD, radiation and porous media model for evaluating the micro-climate in an urban environment , 2014 .

[44]  H. Taha.  Urban climates and heat islands: albedo, evapotranspiration, and anthropogenic heat , 1997 .

[45]  Shuzo Murakami,et al.  Environmental design of outdoor climate based on CFD , 2006 .

[46]  P. Bradshaw,et al.  Momentum transfer in boundary layers , 1977 .

[47]  Yoshihide Tominaga,et al.  CFD modeling of pollution dispersion in a street canyon: Comparison between LES and RANS , 2011 .

[48]  Gerald Mills,et al.  Progress toward sustainable settlements: a role for urban climatology , 2006 .

[49]  Jan Carmeliet,et al.  Comparative assessment of various heat island mitigation measures , 2014 .

[50]  Dominique Derome,et al.  Coupled CFD, radiation and porous media transport model for evaluating evaporative cooling in an urban environment , 2012 .

[51]  V. Dorer,et al.  Urban Physics: Effect of the micro-climate on comfort, health and energy demand , 2012 .

[52]  Valéry Masson,et al.  Impact of urban heat island on regional atmospheric pollution , 2006 .