{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/121372"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/121372","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Resolvent-based framework for jet noise reduction of a low bypass ratio coannular nozzle","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01","abstract_has_math":false,"creators":["Woo, Jaywon"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Aerospace Engineering","degree_department":null,"school":null,"contributors":["Bodony, Daniel J"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-08","date_published":"2023-08","updated_at":"2026-07-22T22:24:57Z","subjects":["Cfd","Jnr","Computational Aeroacoustics","Resolvent Analysis","Jet Noise","Mixed-streams Nozzle"],"languages":["en","eng"],"rights":["Copyright 2023 Jaywon Woo"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/121372","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Bodony, Daniel J"]},{"key":"dc:creator","label":"Author","values":["Woo, Jaywon"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2023-08","2023-07-19"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Aerospace 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":["Cfd","Jnr","Computational Aeroacoustics","Resolvent Analysis","Jet Noise","Mixed-streams Nozzle"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2023 Jaywon Woo"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/121372"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01","The student, Jaywon Woo, accepted the attached license on 2023-07-16 at 20:01.","The student, Jaywon Woo, submitted this Thesis for approval on 2023-07-16 at 20:13.","This Thesis was approved for publication on 2023-07-19 at 16:21.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19704 on 2023-12-04 at 17:18:48","The development of jet noise reduction (JNR) techniques is critical to the integration of supersonic aircraft into commercial travel and transportation. Prescribing JNR methods remains inherently difficult as the reduction of sound is frequently accompanied by a reduction in nozzle performance. This paper utilizes resolvent analysis as a reduced-order modeling technique for the purpose of assessing jet noise reduction concepts on a low bypass ratio coannular nozzle design. An automated framework is built to facilitate the computation of resolvent gain values for varying nozzle conditions and geometries. Specifically, parametric studies are conducted on the mixing duct length and extraction ratio parameters of the nozzle design. RANS mean flow data, used as input for the resolvent computation, are validated against experimental data for the same nozzle configuration. Verification of the linear operator used to define the resolvent is established through comparisons with well-known analytical solutions. Subsequently, the resolvent analysis is verified by comparing sets of singular values and forcing/response modes against corresponding plots reported in the literature. Gain profiles computed for a range of nozzle mixing duct lengths are found to be insensitive to this design parameter. Likewise, gain profiles are also found to be insensitive to variations in extraction ratio at constant thrust. Both of these behaviors are found to be consistent with experimental data suggesting an insubstantial change in noise when varying these nozzle operating parameters. Applying resolvent analysis as a means to assess JNR potential shows promise for comparative design studies, though other nozzle designs and/or operating conditions are needed to positively affirm this."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Resolvent-based framework for jet noise reduction of a low bypass ratio coannular nozzle"]}]}],"canonical_facts":{"dc:contributor":["Bodony, Daniel J"],"dc:creator":["Woo, Jaywon"],"dc:date":["2023-08","2023-07-19"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01","The student, Jaywon Woo, accepted the attached license on 2023-07-16 at 20:01.","The student, Jaywon Woo, submitted this Thesis for approval on 2023-07-16 at 20:13.","This Thesis was approved for publication on 2023-07-19 at 16:21.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19704 on 2023-12-04 at 17:18:48","The development of jet noise reduction (JNR) techniques is critical to the integration of supersonic aircraft into commercial travel and transportation. Prescribing JNR methods remains inherently difficult as the reduction of sound is frequently accompanied by a reduction in nozzle performance. This paper utilizes resolvent analysis as a reduced-order modeling technique for the purpose of assessing jet noise reduction concepts on a low bypass ratio coannular nozzle design. An automated framework is built to facilitate the computation of resolvent gain values for varying nozzle conditions and geometries. Specifically, parametric studies are conducted on the mixing duct length and extraction ratio parameters of the nozzle design. RANS mean flow data, used as input for the resolvent computation, are validated against experimental data for the same nozzle configuration. Verification of the linear operator used to define the resolvent is established through comparisons with well-known analytical solutions. Subsequently, the resolvent analysis is verified by comparing sets of singular values and forcing/response modes against corresponding plots reported in the literature. Gain profiles computed for a range of nozzle mixing duct lengths are found to be insensitive to this design parameter. Likewise, gain profiles are also found to be insensitive to variations in extraction ratio at constant thrust. Both of these behaviors are found to be consistent with experimental data suggesting an insubstantial change in noise when varying these nozzle operating parameters. Applying resolvent analysis as a means to assess JNR potential shows promise for comparative design studies, though other nozzle designs and/or operating conditions are needed to positively affirm this."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/121372"],"dc:language":["en","eng"],"dc:rights":["Copyright 2023 Jaywon Woo"],"dc:subject":["Cfd","Jnr","Computational Aeroacoustics","Resolvent Analysis","Jet Noise","Mixed-streams Nozzle"],"dc:title":["Resolvent-based framework for jet noise reduction of a low bypass ratio coannular nozzle"],"dc:type":["text"],"thesis:degree_discipline":["Aerospace Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:57Z"}