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The drag force distribution within regular arrays of cubes and its relation to cross ventilation – Theoretical and experimental analyses
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science. Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, University of Salento, Lecce, Italy.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
Department of Physics and Astronomy, University of Bologna, Bologna, Italy.
2019 (English)In: Journal of Wind Engineering and Industrial Aerodynamics, ISSN 0167-6105, E-ISSN 1872-8197, Vol. 189, p. 91-103Article in journal (Refereed) Published
Abstract [en]

A novel set of wind tunnel measurements of the drag force and its spatial distribution along aligned arrays of cubes of height H and planar area index λ p (air gap between cubes) equal to 0.028 (5H) to 0.69 (0.2H) is presented and analysed. Two different types of measurements are compared: one type where the drag force is obtained using the standard load cell method, another type where the drag force is estimated by measuring the pressure difference between windward and the leeward façades. Results show that the drag force is nearly uniformly distributed for lower λ p (0.028 and 0.0625), it decreases up to 50% at the second row for λ p = 0.11, and it sharply decreases for larger λ p (from 0.25 to 0.69) where the force mostly acts on the first row. It follows that for the lowest λ p the drag force typically formulated as a drag area corresponds to the total frontal area of the array, whereas for large λ p the drag area corresponds to the area of the first row. By assessing the driving pressure for ventilation from the drag force, the analysis is extended to estimate the cross ventilation as an example of application of this type of measurements. 

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 189, p. 91-103
Keywords [en]
Cross ventilation, Cubic building arrays, Drag area, Drag distribution, Interference factor, Standard load cell, Geometry, Ventilation, Wind tunnels, Aligned arrays, Cubic building, Experimental analysis, Pressure differences, Standard loads, Wind tunnel measurements, Drag
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:hig:diva-30516DOI: 10.1016/j.jweia.2019.03.022ISI: 000467392500008Scopus ID: 2-s2.0-85064004026OAI: oai:DiVA.org:hig-30516DiVA, id: diva2:1343657
Funder
EU, Horizon 2020, 689954Available from: 2019-08-19 Created: 2019-08-19 Last updated: 2019-08-20Bibliographically approved

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Sandberg, MatsWigö, Hans

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