{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/90652"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/90652","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Experimental study of turbulence past thin tabs","abstract":"The turbulence past thin tabs of rectangular, triangular, and ellipsoidal geometries is experimentally investigated using particle image velocimetry at Reynolds number Re=2000 and Re=12900 based on the tabs height and freestream velocity. Turbulence statistics including streamwise velocity, turbulent kinetic energy (TKE), and vortex swirling strength are obtained in the symmetry plane of each tab. The results show a strong dependency of the tab geometry on the strength of the induced vortical structures at the low Re. The turbulent flow regime at high Re promotes high shear stress and TKE production right past the tabs, where the rectangular tab induces greater mixing. The spanwise vortices from the rectangular tab have an average vortex cores radius 20% larger and nearly 30% greater circulation as compared to those from the ellipsoidal tab. Compared to the ones produced by the triangular tab, the core radius is 25% larger and the circulation is almost 50% higher. Our results also show, for the rst time, that hairpin structures are possible in triangular tabs. Finally, we conclude that geometrical singularity plays an important role in the strength of the primary vortical structures shed by the tabs.","abstract_html":"The turbulence past thin tabs of rectangular, triangular, and ellipsoidal geometries is experimentally investigated using particle image velocimetry at Reynolds number Re=2000 and Re=12900 based on the tabs height and freestream velocity. Turbulence statistics including streamwise velocity, turbulent kinetic energy (TKE), and vortex swirling strength are obtained in the symmetry plane of each tab. The results show a strong dependency of the tab geometry on the strength of the induced vortical structures at the low Re. The turbulent flow regime at high Re promotes high shear stress and TKE production right past the tabs, where the rectangular tab induces greater mixing. The spanwise vortices from the rectangular tab have an average vortex cores radius 20% larger and nearly 30% greater circulation as compared to those from the ellipsoidal tab. Compared to the ones produced by the triangular tab, the core radius is 25% larger and the circulation is almost 50% higher. Our results also show, for the rst time, that hairpin structures are possible in triangular tabs. Finally, we conclude that geometrical singularity plays an important role in the strength of the primary vortical structures shed by the tabs.","abstract_has_math":false,"creators":["Pagan Vazquez, Axy E"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Chamorro, Leonardo P."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-07-07T19:58:04Z","date_published":"2016-07-07T19:58:04Z","updated_at":"2026-07-22T22:26:34Z","subjects":["Experimental Fluid Mechanics","Turbulence","Particle Image Velocimetry","Vortex Generators"],"languages":["en"],"rights":["Copyright 2016 by Axy Pagan-Vazquez."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/90652","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Chamorro, Leonardo P."]},{"key":"dc:creator","label":"Author","values":["Pagan Vazquez, Axy E"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2016-07-07T19:58:04Z","2016-04-27","2016-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Experimental Fluid Mechanics","Turbulence","Particle Image Velocimetry","Vortex Generators"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2016 by Axy Pagan-Vazquez."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/90652"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The turbulence past thin tabs of rectangular, triangular, and ellipsoidal geometries is experimentally investigated using particle image velocimetry at Reynolds number Re=2000 and Re=12900 based on the tabs height and freestream velocity. Turbulence statistics including streamwise velocity, turbulent kinetic energy (TKE), and vortex swirling strength are obtained in the symmetry plane of each tab. The results show a strong dependency of the tab geometry on the strength of the induced vortical structures at the low Re. The turbulent flow regime at high Re promotes high shear stress and TKE production right past the tabs, where the rectangular tab induces greater mixing. The spanwise vortices from the rectangular tab have an average vortex cores radius 20% larger and nearly 30% greater circulation as compared to those from the ellipsoidal tab. Compared to the ones produced by the triangular tab, the core radius is 25% larger and the circulation is almost 50% higher. Our results also show, for the rst time, that hairpin structures are possible in triangular tabs. Finally, we conclude that geometrical singularity plays an important role in the strength of the primary vortical structures shed by the tabs.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-07-07 without embargo terms","The student, Axy Pagan Vazquez, accepted the attached license on 2016-04-26 at 01:03.","The student, Axy Pagan Vazquez, submitted this Thesis for approval on 2016-04-26 at 06:27.","This Thesis was approved for publication on 2016-04-27 at 14:51.","DSpace SAF Submission Ingestion Package generated from Vireo submission #9493 on 2016-07-07 at 13:33:07","Made available in DSpace on 2016-07-07T19:58:04Z (GMT). No. of bitstreams: 3 PAGANVAZQUEZ-THESIS-2016.pdf: 82856263 bytes, checksum: 59c767aeb758c04e65f4fa299600122f (MD5) Source_Codes.zip: 207083 bytes, checksum: 585dfe76964acdfbbe30514e8138df9a (MD5) LICENSE.txt: 4208 bytes, checksum: 8be557435f0cb0b8315531b24905d8cd (MD5) Previous issue date: 2016-04-27"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Experimental study of turbulence past thin tabs"]}]}],"canonical_facts":{"dc:contributor":["Chamorro, Leonardo P."],"dc:creator":["Pagan Vazquez, Axy E"],"dc:date":["2016-07-07T19:58:04Z","2016-04-27","2016-05"],"dc:description":["The turbulence past thin tabs of rectangular, triangular, and ellipsoidal geometries is experimentally investigated using particle image velocimetry at Reynolds number Re=2000 and Re=12900 based on the tabs height and freestream velocity. Turbulence statistics including streamwise velocity, turbulent kinetic energy (TKE), and vortex swirling strength are obtained in the symmetry plane of each tab. The results show a strong dependency of the tab geometry on the strength of the induced vortical structures at the low Re. The turbulent flow regime at high Re promotes high shear stress and TKE production right past the tabs, where the rectangular tab induces greater mixing. The spanwise vortices from the rectangular tab have an average vortex cores radius 20% larger and nearly 30% greater circulation as compared to those from the ellipsoidal tab. Compared to the ones produced by the triangular tab, the core radius is 25% larger and the circulation is almost 50% higher. Our results also show, for the rst time, that hairpin structures are possible in triangular tabs. Finally, we conclude that geometrical singularity plays an important role in the strength of the primary vortical structures shed by the tabs.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-07-07 without embargo terms","The student, Axy Pagan Vazquez, accepted the attached license on 2016-04-26 at 01:03.","The student, Axy Pagan Vazquez, submitted this Thesis for approval on 2016-04-26 at 06:27.","This Thesis was approved for publication on 2016-04-27 at 14:51.","DSpace SAF Submission Ingestion Package generated from Vireo submission #9493 on 2016-07-07 at 13:33:07","Made available in DSpace on 2016-07-07T19:58:04Z (GMT). No. of bitstreams: 3 PAGANVAZQUEZ-THESIS-2016.pdf: 82856263 bytes, checksum: 59c767aeb758c04e65f4fa299600122f (MD5) Source_Codes.zip: 207083 bytes, checksum: 585dfe76964acdfbbe30514e8138df9a (MD5) LICENSE.txt: 4208 bytes, checksum: 8be557435f0cb0b8315531b24905d8cd (MD5) Previous issue date: 2016-04-27"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/90652"],"dc:language":["en"],"dc:rights":["Copyright 2016 by Axy Pagan-Vazquez."],"dc:subject":["Experimental Fluid Mechanics","Turbulence","Particle Image Velocimetry","Vortex Generators"],"dc:title":["Experimental study of turbulence past thin tabs"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:34Z"}