{"id":{"repo_id":"uwo","oai_identifier":"oai:uwo.scholaris.ca:20.500.14721/27581"},"canonical_url":"https://search.dev.ndltd.org/etd/uwo/oai:uwo.scholaris.ca:20.500.14721/27581","repository":{"repo_id":"uwo","name":"Western University","base_url":"https://uwo.scholaris.ca/server/oai/request"},"display":{"title":"Influence of Turbulence on the Aerodynamics of Low-Rise Buildings","abstract":"During extreme wind events, roofing failures may lead to damage of the whole structure. In order to alleviate the effect, surface pressure coefficients on the roofs have been extensively investigated. This research aims to determine the roof pressures acting on low-rise buildings with consideration of the effects of turbulence (terrain). Pressure measurements, as well as wind speed data, were taken at the Boundary Layer Wind Tunnel Laboratory (BLWTL) of the University of Western Ontario (UWO) to examine the influence of turbulence level (i.e., terrain condition) on the critical wind directions corresponding to the largest surface roof pressure coefficients for various upstream boundary layer conditions. In addition, plan dimensions and eave heights of the building were also varied. Generally, corner vortices play a vital role in generating larger suction pressures on the roof surface in flat terrain. Moreover, separation bubble at the leading edge of low-rise buildings is also significant to take into consideration for winds normal to the walls. Our objective is to examine these points in terms of area-averages used in design. The results indicate that corner vortices control larger area on the roof surface among all angles of attack in lower turbulence flow (i.e., flat terrain), whereas this effect is reduced in higher turbulence level (i.e., suburban terrain) for all plan shapes. In addition, the size of the corner vortices along both edges of the roof increases with building height for low-rise buildings, consistent with the new requirements in ASCE 7 – 16. It is also found that the critical wind directions depend significantly on the turbulence level and building height. The critical wind directions for the corner zones of low-rise building roofs are primarily due to oblique angles (i.e., corner vortices), while they are normal wind directions (i.e., bubble separation) for the edge, and interior zones, when the tributary areas are small. The magnitude of peak pressure coefficients, GCp, depend more on the integral length scales compared to the turbulence intensity, which may be important in some design scenarios.","abstract_html":"During extreme wind events, roofing failures may lead to damage of the whole structure. In order to alleviate the effect, surface pressure coefficients on the roofs have been extensively investigated. This research aims to determine the roof pressures acting on low-rise buildings with consideration of the effects of turbulence (terrain). Pressure measurements, as well as wind speed data, were taken at the Boundary Layer Wind Tunnel Laboratory (BLWTL) of the University of Western Ontario (UWO) to examine the influence of turbulence level (i.e., terrain condition) on the critical wind directions corresponding to the largest surface roof pressure coefficients for various upstream boundary layer conditions. In addition, plan dimensions and eave heights of the building were also varied. Generally, corner vortices play a vital role in generating larger suction pressures on the roof surface in flat terrain. Moreover, separation bubble at the leading edge of low-rise buildings is also significant to take into consideration for winds normal to the walls. Our objective is to examine these points in terms of area-averages used in design. The results indicate that corner vortices control larger area on the roof surface among all angles of attack in lower turbulence flow (i.e., flat terrain), whereas this effect is reduced in higher turbulence level (i.e., suburban terrain) for all plan shapes. In addition, the size of the corner vortices along both edges of the roof increases with building height for low-rise buildings, consistent with the new requirements in ASCE 7 – 16. It is also found that the critical wind directions depend significantly on the turbulence level and building height. The critical wind directions for the corner zones of low-rise building roofs are primarily due to oblique angles (i.e., corner vortices), while they are normal wind directions (i.e., bubble separation) for the edge, and interior zones, when the tributary areas are small. The magnitude of peak pressure coefficients, GCp, depend more on the integral length scales compared to the turbulence intensity, which may be important in some design scenarios.","abstract_has_math":false,"creators":["Arif, Fakhruzzaman"],"institution":"The University of Western Ontario","degree_name":"M Eng Sci","degree_level":null,"degree_discipline":"Civil and Environmental Engineering","degree_department":null,"school":null,"contributors":[],"advisors":["Kopp, Gregory A."],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-09-28","date_published":"2017-09-28","updated_at":"2026-07-27T21:55:54Z","subjects":["Building aerodynamics","Wind loads","Peak pressure coefficients","Critical wind directions","Low-rise buildings","Turbulence."],"languages":["en_ca"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/20.500.14721/27581","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Kopp, Gregory A."]},{"key":"dc:creator","label":"Author","values":["Arif, Fakhruzzaman"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-07-10T15:30:51Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-07-10T15:30:51Z"]},{"key":"dc:date.issued","label":"Date","values":["2017-09-28"]},{"key":"dc:publisher","label":"Institution","values":["The University of Western Ontario"]},{"key":"dc:type","label":"Dc Type","values":["thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil and Environmental Engineering"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M Eng Sci"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Building aerodynamics","Wind loads","Peak pressure coefficients","Critical wind directions","Low-rise buildings","Turbulence."]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_ca"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/20.500.14721/27581"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The thesis cover page in the PDF document includes references to Western University’s previous institutional repository platform, known as Scholarship@Western, and links to that platform (beginning with ir.lib.uwo.ca). In citing or referring to this thesis, use the DOI or handle from this page instead. Sample citation: Author name, \"Thesis title.\" (Year). Western University Open Repository. https://doi.org/10.71858/123456."]},{"key":"dc:description.abstract","label":"Abstract","values":["During extreme wind events, roofing failures may lead to damage of the whole structure. In order to alleviate the effect, surface pressure coefficients on the roofs have been extensively investigated. This research aims to determine the roof pressures acting on low-rise buildings with consideration of the effects of turbulence (terrain). Pressure measurements, as well as wind speed data, were taken at the Boundary Layer Wind Tunnel Laboratory (BLWTL) of the University of Western Ontario (UWO) to examine the influence of turbulence level (i.e., terrain condition) on the critical wind directions corresponding to the largest surface roof pressure coefficients for various upstream boundary layer conditions. In addition, plan dimensions and eave heights of the building were also varied. Generally, corner vortices play a vital role in generating larger suction pressures on the roof surface in flat terrain. Moreover, separation bubble at the leading edge of low-rise buildings is also significant to take into consideration for winds normal to the walls. Our objective is to examine these points in terms of area-averages used in design. The results indicate that corner vortices control larger area on the roof surface among all angles of attack in lower turbulence flow (i.e., flat terrain), whereas this effect is reduced in higher turbulence level (i.e., suburban terrain) for all plan shapes. In addition, the size of the corner vortices along both edges of the roof increases with building height for low-rise buildings, consistent with the new requirements in ASCE 7 – 16. It is also found that the critical wind directions depend significantly on the turbulence level and building height. The critical wind directions for the corner zones of low-rise building roofs are primarily due to oblique angles (i.e., corner vortices), while they are normal wind directions (i.e., bubble separation) for the edge, and interior zones, when the tributary areas are small. The magnitude of peak pressure coefficients, GCp, depend more on the integral length scales compared to the turbulence intensity, which may be important in some design scenarios."]},{"key":"dc:title","label":"Title","values":["Influence of Turbulence on the Aerodynamics of Low-Rise Buildings"]}]}],"canonical_facts":{"dc:contributor.advisor":["Kopp, Gregory A."],"dc:creator":["Arif, Fakhruzzaman"],"dc:date.accessioned":["2025-07-10T15:30:51Z"],"dc:date.available":["2025-07-10T15:30:51Z"],"dc:date.issued":["2017-09-28"],"dc:description":["The thesis cover page in the PDF document includes references to Western University’s previous institutional repository platform, known as Scholarship@Western, and links to that platform (beginning with ir.lib.uwo.ca). In citing or referring to this thesis, use the DOI or handle from this page instead. Sample citation: Author name, \"Thesis title.\" (Year). Western University Open Repository. https://doi.org/10.71858/123456."],"dc:description.abstract":["During extreme wind events, roofing failures may lead to damage of the whole structure. In order to alleviate the effect, surface pressure coefficients on the roofs have been extensively investigated. This research aims to determine the roof pressures acting on low-rise buildings with consideration of the effects of turbulence (terrain). Pressure measurements, as well as wind speed data, were taken at the Boundary Layer Wind Tunnel Laboratory (BLWTL) of the University of Western Ontario (UWO) to examine the influence of turbulence level (i.e., terrain condition) on the critical wind directions corresponding to the largest surface roof pressure coefficients for various upstream boundary layer conditions. In addition, plan dimensions and eave heights of the building were also varied. Generally, corner vortices play a vital role in generating larger suction pressures on the roof surface in flat terrain. Moreover, separation bubble at the leading edge of low-rise buildings is also significant to take into consideration for winds normal to the walls. Our objective is to examine these points in terms of area-averages used in design. The results indicate that corner vortices control larger area on the roof surface among all angles of attack in lower turbulence flow (i.e., flat terrain), whereas this effect is reduced in higher turbulence level (i.e., suburban terrain) for all plan shapes. In addition, the size of the corner vortices along both edges of the roof increases with building height for low-rise buildings, consistent with the new requirements in ASCE 7 – 16. It is also found that the critical wind directions depend significantly on the turbulence level and building height. The critical wind directions for the corner zones of low-rise building roofs are primarily due to oblique angles (i.e., corner vortices), while they are normal wind directions (i.e., bubble separation) for the edge, and interior zones, when the tributary areas are small. The magnitude of peak pressure coefficients, GCp, depend more on the integral length scales compared to the turbulence intensity, which may be important in some design scenarios."],"dc:identifier.uri":["https://hdl.handle.net/20.500.14721/27581"],"dc:language.iso":["en_ca"],"dc:publisher":["The University of Western Ontario"],"dc:subject":["Building aerodynamics","Wind loads","Peak pressure coefficients","Critical wind directions","Low-rise buildings","Turbulence."],"dc:title":["Influence of Turbulence on the Aerodynamics of Low-Rise Buildings"],"dc:type":["thesis"],"thesis:degree_discipline":["Civil and Environmental Engineering"],"thesis:degree_name":["M Eng Sci"]},"updated_at":"2026-07-27T21:55:54Z"}