{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/24022"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/24022","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Study of reduced order models for vortex-induced vibration and comparison with CFD results","abstract":"Vortex-induced vibration (VIV) is a dynamic phenomenon that can occur when there is fluid flow past a bluff body with flexibility. Over time, VIV can cause fatigue damage, so it may be desirable to suppress these vibrations. It is important to understand how the system behaves when trying to control vibrations; a reduced order model may be an effective way to study the system dynamics. Developing a data driven model from simulation and/or experimental results can be difficult, but there are existing phenomenological models that attempt to describe VIV, several of which will be explored in this thesis. These models consist of a structural equation representing a simple sprung bluff body coupled to a wake equation representing the effects of the surrounding fluid on the oscillator; the latter is generally a nonlinear oscillator exhibiting limit cycle behavior. The coupling, structural equation, and type of nonlinearity in the wake equation vary between different models, and the effects of these differences will be explored. The parameters of these equations must be identified, and then results from these models will be compared with the results obtained from a high fidelity CFD simulation to determine the relative quality of each reduced order model. The deficiencies of each model and the effects they produce will also be explored. Finally, the most important traits of each reduced order model will be identified, and, finally, the best reduced order model, with specific parameter values, will be presented.","abstract_html":"Vortex-induced vibration (VIV) is a dynamic phenomenon that can occur when there is fluid flow past a bluff body with flexibility. Over time, VIV can cause fatigue damage, so it may be desirable to suppress these vibrations. It is important to understand how the system behaves when trying to control vibrations; a reduced order model may be an effective way to study the system dynamics. Developing a data driven model from simulation and/or experimental results can be difficult, but there are existing phenomenological models that attempt to describe VIV, several of which will be explored in this thesis. These models consist of a structural equation representing a simple sprung bluff body coupled to a wake equation representing the effects of the surrounding fluid on the oscillator; the latter is generally a nonlinear oscillator exhibiting limit cycle behavior. The coupling, structural equation, and type of nonlinearity in the wake equation vary between different models, and the effects of these differences will be explored. The parameters of these equations must be identified, and then results from these models will be compared with the results obtained from a high fidelity CFD simulation to determine the relative quality of each reduced order model. The deficiencies of each model and the effects they produce will also be explored. Finally, the most important traits of each reduced order model will be identified, and, finally, the best reduced order model, with specific parameter values, will be presented.","abstract_has_math":false,"creators":["Olenek, Christopher W."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Vakakis, Alexander F.","Bergman, Lawrence A."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-25T15:06:00Z","date_published":"2011-05-25T15:06:00Z","updated_at":"2026-07-22T22:25:24Z","subjects":["vortex-induced vibration"],"languages":["en"],"rights":["Copyright 2011 Christopher W. Olenek"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/24022","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Vakakis, Alexander F.","Bergman, Lawrence A."]},{"key":"dc:creator","label":"Author","values":["Olenek, Christopher W."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-25T15:06:00Z","2011-05"]},{"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":["vortex-induced vibration"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2011 Christopher W. Olenek"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/24022"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Vortex-induced vibration (VIV) is a dynamic phenomenon that can occur when there is fluid flow past a bluff body with flexibility. Over time, VIV can cause fatigue damage, so it may be desirable to suppress these vibrations. It is important to understand how the system behaves when trying to control vibrations; a reduced order model may be an effective way to study the system dynamics. Developing a data driven model from simulation and/or experimental results can be difficult, but there are existing phenomenological models that attempt to describe VIV, several of which will be explored in this thesis. These models consist of a structural equation representing a simple sprung bluff body coupled to a wake equation representing the effects of the surrounding fluid on the oscillator; the latter is generally a nonlinear oscillator exhibiting limit cycle behavior. The coupling, structural equation, and type of nonlinearity in the wake equation vary between different models, and the effects of these differences will be explored. The parameters of these equations must be identified, and then results from these models will be compared with the results obtained from a high fidelity CFD simulation to determine the relative quality of each reduced order model. The deficiencies of each model and the effects they produce will also be explored. Finally, the most important traits of each reduced order model will be identified, and, finally, the best reduced order model, with specific parameter values, will be presented.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-04-28T14:29:37Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 OLENEK_CHRISTOPHER.pdf: 3769305 bytes, checksum: 7bcb3d1f8380458039f14e66a319f699 (MD5)","Made available in DSpace on 2011-05-25T15:06:00Z (GMT). No. of bitstreams: 2 OLENEK_CHRISTOPHER.pdf: 3769299 bytes, checksum: 09a9b6a7d22f9196976559c6b42bcd27 (MD5) license.txt: 4068 bytes, checksum: fb2539bf1410b64794e83b50a224a0d5 (MD5)"]},{"key":"dc:title","label":"Title","values":["Study of reduced order models for vortex-induced vibration and comparison with CFD results"]}]}],"canonical_facts":{"dc:contributor":["Vakakis, Alexander F.","Bergman, Lawrence A."],"dc:creator":["Olenek, Christopher W."],"dc:date":["2011-05-25T15:06:00Z","2011-05"],"dc:description":["Vortex-induced vibration (VIV) is a dynamic phenomenon that can occur when there is fluid flow past a bluff body with flexibility. Over time, VIV can cause fatigue damage, so it may be desirable to suppress these vibrations. It is important to understand how the system behaves when trying to control vibrations; a reduced order model may be an effective way to study the system dynamics. Developing a data driven model from simulation and/or experimental results can be difficult, but there are existing phenomenological models that attempt to describe VIV, several of which will be explored in this thesis. These models consist of a structural equation representing a simple sprung bluff body coupled to a wake equation representing the effects of the surrounding fluid on the oscillator; the latter is generally a nonlinear oscillator exhibiting limit cycle behavior. The coupling, structural equation, and type of nonlinearity in the wake equation vary between different models, and the effects of these differences will be explored. The parameters of these equations must be identified, and then results from these models will be compared with the results obtained from a high fidelity CFD simulation to determine the relative quality of each reduced order model. The deficiencies of each model and the effects they produce will also be explored. Finally, the most important traits of each reduced order model will be identified, and, finally, the best reduced order model, with specific parameter values, will be presented.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-04-28T14:29:37Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 OLENEK_CHRISTOPHER.pdf: 3769305 bytes, checksum: 7bcb3d1f8380458039f14e66a319f699 (MD5)","Made available in DSpace on 2011-05-25T15:06:00Z (GMT). No. of bitstreams: 2 OLENEK_CHRISTOPHER.pdf: 3769299 bytes, checksum: 09a9b6a7d22f9196976559c6b42bcd27 (MD5) license.txt: 4068 bytes, checksum: fb2539bf1410b64794e83b50a224a0d5 (MD5)"],"dc:identifier":["http://hdl.handle.net/2142/24022"],"dc:language":["en"],"dc:rights":["Copyright 2011 Christopher W. Olenek"],"dc:subject":["vortex-induced vibration"],"dc:title":["Study of reduced order models for vortex-induced vibration and comparison with CFD results"],"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":"2026-07-22T22:25:24Z"}