Dispersion of localised releases in a street network (DIPLOS)

Lead Research Organisation: University of Southampton
Department Name: Faculty of Engineering & the Environment

Abstract

Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.
 
Description The character of the scalar dispersion from a localized source in an array of rectangular buildings strongly depends on the position of the source relative to the street network and the wind direction.

In the simulated case with wind direction 0°, where the scalar source lies in a street perpendicular to the mean flow, the scalar is transported above the canopy by the recirculation in the street canyon. The streamwise scalar flux above the canopy is then larger than the corresponding flux below the roof level. The vertical concentration variance sz at the plume centreline is larger than 1H and is increasing with the distance from the source.

The asymmetry of the experimental results and a computational sensitivity study showed that a small change of the wind direction between 1° and 3° can strongly affect the plume shape. We should take into account such uncertainties into the quick prediction models.
When the scalar source is located in the street parallel to the mean wind direction, as in the simulated 90° case, the scalar is advected by the mean flow inside the street and transported upwards by turbulence and by recirculating flow in the spanwise streets. The streamwise scalar flux within the canopy is larger than the corresponding flux above and the sz at the plume centreline is smaller than 1H within the simulated domain.
Exploitation Route The obtained knowledge will be shared through publication, conferences/workshops etc; also through partnership with others.
Sectors Aerospace, Defence and Marine,Energy,Environment,Security and Diplomacy
URL http://www.diplos.org
 
Description 1. The developed approaches have been used in the DSTL part-time phd project 'Modelling the production and transport of vapour from explosives in an indoor environment considering effects of mechanical and natural ventilation'. The project is conducted by DSTL employee Mr Tim Foat under Dr ZT Xie's supervision. 2. The developed technology has been used in Wessex Petroleum Limited (WP), and has successfully approved WP Fuel Solutions' new concept - a more effective bottom filtration pipework for fuel tanks. 3. The research output resulted in a new research project ( Air Quality Around Tall Buildings in London) with industry company RWDI funded by London City Council, 2018-19.
First Year Of Impact 2015
Sector Aerospace, Defence and Marine,Energy,Environment
Impact Types Policy & public services
 
Description Breathing City: Future Urban Ventilation Network
Amount £507,945 (GBP)
Funding ID NE/V002082/1 
Organisation Natural Environment Research Council 
Sector Public
Country United Kingdom
Start 09/2020 
End 08/2023
 
Description Fluid dynamics of Urban Tall-building clUsters for Resilient built Environments (FUTURE)
Amount £364,640 (GBP)
Funding ID EP/V010514/1 
Organisation Engineering and Physical Sciences Research Council (EPSRC) 
Sector Public
Country United Kingdom
Start 01/2021 
End 12/2023
 
Description ARCHER eCSE 
Organisation Engineering and Physical Sciences Research Council (EPSRC)
Department ARCHER Service
Country United Kingdom 
Sector Academic/University 
PI Contribution the developed code will be made accessible to the ARCHER community.
Collaborator Contribution technique support, etc.
Impact to come.
 
Description Newton Research Collaboration Programme 14/03/2017-14/03/2018 with Brazilian partners 
Organisation Federal University of Espírito Santo
Country Brazil 
Sector Academic/University 
PI Contribution The collaboration between UFES in Brazil and the University of Southampton in the UK will allow for partaking LES, DNS and wind tunnel experimental data obtained in a previous project developed by the University of Southampton with UK partners. It will also allow for sharing knowledge and experience already gained by both teams about the methodologies involved in using turbulence models. Turbulence modelling is a big challenge, enhancing the knowledge of LES and DNS will certainly help the UK engineering community. The UK Met Office, DSTL and NCAS (National Centre for Atmospheric Science) are the partners of the DIPLOS project for which the Applicant is the Southampton PI. These partners will attend the final DIPLOS workshop in Mar/2017 in Southampton. Contribution from the co-Applicant's team will benefit to these partners. In addition, the Applicant is a member of NCAS, a committee member of the UK Wind Engineering Society and is currently supported by DSTL through a few Phd student projects. The proposed project will be beneficial to all of these collaborations.
Collaborator Contribution The co-Applicant's team will test the Applicant's recently developed tool - a Numerical Environmental Wind Tunnel Of Newtonian fluid (NEWTON) for a wider range of applications, such as thermal stratification effects. Brazil has several research funding agencies which, in time, can be used to fund further research on the topic. In addition, the Supercomputing Centre for Industrial Innovation (YEMOJA), which is the largest in Latin America, is fully accessible to the Brazilian research group including academic visitors.
Impact The two teams will publish 5 journal and conference papers. These will have impacts for the international engineering community and the general public.
Start Year 2007
 
Description Supervising a DSTL employee as a Part-Time PhD student in Southampton 
Organisation Defence Science & Technology Laboratory (DSTL)
Country United Kingdom 
Sector Public 
PI Contribution The title of the part-time phd research of DSTL is 'Modelling the production and transport of vapour from explosives in an indoor environment considering effects of mechanical and natural ventilation'. The phd student Tim Foat has successfully passed his first milestone viva. My research team provides expertise, and computer resources.
Collaborator Contribution Tim Foat in turn inputs industry drivers, reported conf papers with Southampton as co-institution, and is writing joint papers with Southampton.
Impact A joint conference paper (DSTL+ Southampton) was reported in the 68th Annual Meeting of the APS Division of Fluid Dynamics. http://meetings.aps.org/Meeting/DFD15/Event/255644
Start Year 2014
 
Description co-supervising a phd student in Eindhoven University of Technology 
Organisation Eindhoven University of Technology
Country Netherlands 
Sector Academic/University 
PI Contribution co-supervising a phd student in Eindhoven University of Technology
Collaborator Contribution In turn the partner will co-publish paper with me, provide experimental data etc.
Impact To come
Start Year 2006
 
Description collaboration with DSTL 
Organisation Defence Science & Technology Laboratory (DSTL)
Country United Kingdom 
Sector Public 
PI Contribution The university of Southampton will provide 50% of two phd studentships (and other relevant support), which will be co-supervised with DSTL.
Collaborator Contribution DSTL ill provide 50% of two phd studentships.
Impact this collaboration has just started and we are recruiting the phd students.
Start Year 2014