Special Issue "Recent Advances in Urban Ventilation Assessment and Flow Modelling"
A special issue of Atmosphere (ISSN 2073-4433).
Deadline for manuscript submissions: 31 May 2018
Dr. Jian Hang
We invite researchers to contribute original research articles, as well as review articles, dealing with all aspects of ventilation in urban areas. These contributions include recent experimental and modeling works, techniques and developments tailored to the assessment of urban ventilation and flow and pollutant dispersion in cities. We are also interested in reviews with possible future lines of investigations. Topics of interest include, but are not limited to:
ventilation efficiency and application/development of ventilation indices;
relation between indoor and outdoor ventilation;
effects of urban morphology and obstacles on ventilation;
data (meteorological and air quality) from new field campaigns in cities and wind tunnel experiments for the estimation of ventilation indices;
experimental and modeling application studies to real cities with attention to high density cities and high-rise buildings;
mitigation strategies of poor ventilation conditions and urban air pollution.
Dr. Riccardo Buccolieri
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Atmosphere is an international peer-reviewed open access monthly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
- Ventilation efficiency
- Urban morphology and obstacles
- Field and wind tunnel experiments
- Flow modelling
- Mitigation strategies
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Type of Paper: Research Article
Tentative Title: Wind tunnel experiments of flow and turbulence in idealized urban-like geometries with and without viaduct settings
Authors: Jian Hang1, Yuanyuan Lin1, Mats Sandberg2, Riccardo Buccolieri3*, Xuemei Wang1*
1 School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou, P. R. China
2 Laboratory of Ventilation and Air Quality, University of Gävle, SE-80176 Gävle, Sweden
3 Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, University of Salento, S.P. 6 Lecce-Monteroni, 73100 Lecce, Italy
Abstract: Viaduct settings in street canyons is usually employed to improve traffic efficiency, but it also influence turbulent airflows and pollutant dispersion in the urban canopy layer (UCL). This paper presents original results achieved from wind tunnel measurements which investigate the effects of viaduct settings on flow and turbulence profiles in urban-like geometries. The approaching wind is perpendicular to street axis in two-dimensional (2D) street canyon models and parallel to the main street axis in three-dimensional (3D) UCL models. Twelve test cases under neutral atmospheric conditions are considered with two typical street aspect ratios (building height/street width H/W=1 and 0.67) and with or without viaduct settings and noise barriers. Horizontal and vertical profiles of wind velocity and turbulent kinetic energy are measured by hotwire technique. Experimental results suggest that viaduct settings with or without noise barriers significantly affect turbulent airflows in street canyons, especially in regions close to the viaduct. Wind velocity and turbulent kinetic energy are increased or decreased in different regions. We thus expect an influence on pollutant dispersion too. This study confirms that planning urban obstacles, such of viaduct and noise barriers, for improving traffic efficiency and people’s comfort should be done in conjunction with a comprehensive evaluation of their effects on flow and pollutant dispersion.
Keywords: Viaduct settings; Noise barriers; Wind tunnel experiments; Hotwire; Street canyon; Urban canopy layer (UCL)
Tentative Title: Buoyancy-driven flows in heated urban-street canyons
Authors: D. Petsa a, M. Neophytou a,*, C.N. Markides b, H.J.S. Fernando c
a Environmental Fluid Mechanics Laboratory, Department of Civil and Environmental Engineering, University of Cyprus, Nicosia, Cyprus
b Clean Energy Processes (CEP) Laboratory, Department of Chemical Engineering, Imperial College, London, United Kingdom
c Environmental Fluid Dynamics Laboratories, Civil and Environmental Engineering and Geological Sciences, University of Notre Dame, Notre Dame, Indiana
Abstract: In this work we investigate buoyancy-driven flows which arise in rectangular urban street-canyon cavities as a result of differential side-wall heating. Such flows are frequently met in the urban built environment, as a result of uneven heating of building façades due to solar radiation; this uneven heating leads to different outer wall surface temperatures which then cause buoyancy-driven air flows to take place within the street-canyons. We simulated such flows in a laboratory modelled street-canyon cavity using appropriate similarity criteria; cavities of three different aspect (height-to-width) ratios, H/W – of 0.66, 1 and 2 – were investigated. Particle image velocimetry (PIV) measurements were conducted and the resulting flow fields were analysed. The results show that the flow is time-varying and appears to achieve a steady state for the square (H/W=1) and wider canyon (H/W=0.66) cavities; for the narrower canyon (H/W=2) the results show that the flow is highly unsteady. Vortical structures are observed in all geometrical configurations, with different types of vertical counterflows prevailing. In the steady case, the characteristic buoyancy-driven flow velocity of the vortex is found to scale with the square root of the buoyancy flux, B1/2, particularly for the square-canyon geometry, in good agreement with relevant quantitative results reported in the literature.
Keywords: PIV, wind, measurements,, dynamic similarity, experiments