Wind effects on roofs: a joint event between UK Wind Engineering Society and the Romanian Association for Wind Engineering (ARIV)

Published on 30 June 2022

4pm UK Time, 14th July, online event

The roofs of structures often go unnoticed by passers-by, only occasionally being the subject of comment on the most iconic of buildings. For wind engineers, their importance is never underestimated and this joint talk between the UK Wind Engineering Society and the Romanian Association for Wind Engineering shows just how true that is.

From the influence on urban winds of roof shape across arrays of low-rise buildings to the wind loads on the roof of a football stadium, roofs both influence and are susceptible to the wind.

After these two lectures, which will be delivered online, there will be an opportunity to pose questions to the speakers and take part in what we hope will be the first in a series of joint lectures between WES and ARIV.

We look forward to welcoming you - sign up here for free.  

Event Title: Wind effects on roofs:  a joint event between UK Wind Engineering Society and the Romanian Association for Wind Engineering (ARIV)

From the WES side:

Speaker: Matthew Coburn, The University of Southampton

Title: Numerical Simulations of Boundary-Layer Airflow over Pitched-Roof Buildings

Synopsis: Arrays of buildings with pitched roofs are common in urban and suburban areas of European cities. Large eddy simulations were performed to predict the boundary-layer flows over flat and pitched-roof cuboids to gain a greater understanding of the impact of pitched roofs on urban boundary layers. The simulation methodology was validated for an array of flat roof cuboids. Further simulations showed that changes in the type of grid conformity had a negligible effect on the mean flow field and turbulent stresses, while having a visible, but small, effect on the dispersive stresses for a given packing density. Comparisons were made for flat and 45-degree pitched roof cuboid arrays at packing densities of 16.7% and 33.3%. It was concluded that the interactions between pitched-roof buildings and their effect on the urban boundary layer were considerably different to those of flat-roof buildings. The pitched roofs at packing density 33.3% led to significant changes in the mean flow field, the Reynolds stresses, and the aerodynamic drag. Further work investigated the effects of changes in turbulence level and atmospheric thermal stratification in the approaching flow. Importantly, it was found that in comparison to a flat-roof array, the pitched-roof one at a packing density 33.3% evidently increased the friction velocity and greatly reduced the effects of stable stratification conditions and changes in inflow turbulence level.

On the ARIV (Romanian) side: 

Speaker: Andrei Georgescu

Title: Experimental study of the wind action on Steaua Bucharest stadium roof

Synopsis: In this talk, Andrei Georgescu will introduce some of the issues that emerged during the  process of designing and building of the physical model, as well as, the solutions that were used to address them. Some of the capabilities of the Boundary Layer Wind Tunnel used to perform the experiments, will also be discussed in association with the requests of the beneficiary. Finally, some general conclusions are drawn on the accuracy of modeling some physical phenomena in the wind tunnel. 

Bio: Dr Andrei-Mugur Georgescu graduated, in 1987, the Building Services Faculty of the Technical University of Civil Engineering Bucharest (UTCB). In 1999, he obtained his PhD degree in Technical Sciences / Hydraulics and Fluid Mechanics from the same university. Since 1990 he is a member of the academic staff of the UTCB. At present he is a full professor and head of the Hydraulics, Sanitary Engineering and Environmental Protection Department. His current areas of research include Wind engineering; Measurements and data acquisition techniques in fluid mechanics; Water distribution system analysis; Wind and marine current turbines. He is the Vice president of the Romanian Wind Engineering Association (ARIV), member of the Renewable Energy Committee of the Romanian Academy, member of the International Association for Hydro-Environment Engineering and Research (IAHR) and member of the International Water Association (IWA).