{"created":"2025-02-21T03:34:58.055139+00:00","id":2006889,"links":{},"metadata":{"_buckets":{"deposit":"c08e750f-f05f-45bb-b9d2-82de3968755a"},"_deposit":{"created_by":41,"id":"2006889","owners":[41],"pid":{"revision_id":0,"type":"depid","value":"2006889"},"status":"published"},"_oai":{"id":"oai:hiroshima.repo.nii.ac.jp:02006889","sets":["1730444907710"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_title":"Unsteady Secondary Motion of Pulsatile Turbulent Flow through a Double 90°-Bend Duct","subitem_title_language":"en"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Oki, Junichi","creatorNameLang":"en"}],"familyNames":[{"familyName":"Oki","familyNameLang":"en"}],"givenNames":[{"givenName":"Junichi","givenNameLang":"en"}]},{"creatorNames":[{"creatorName":"Kuga, Yukika","creatorNameLang":"en"}],"familyNames":[{"familyName":"Kuga","familyNameLang":"en"}],"givenNames":[{"givenName":"Yukika","givenNameLang":"en"}]},{"creatorNames":[{"creatorName":"Yamamoto, Ryo","creatorNameLang":"en"}],"familyNames":[{"familyName":"Yamamoto","familyNameLang":"en"}],"givenNames":[{"givenName":"Ryo","givenNameLang":"en"}]},{"creatorNames":[{"creatorName":"Nakamura, Kazuhiro","creatorNameLang":"en"}],"familyNames":[{"familyName":"Nakamura","familyNameLang":"en"}],"givenNames":[{"givenName":"Kazuhiro","givenNameLang":"en"}]},{"creatorNames":[{"creatorName":"Yokohata, Hideaki","creatorNameLang":"en"}],"familyNames":[{"familyName":"Yokohata","familyNameLang":"en"}],"givenNames":[{"givenName":"Hideaki","givenNameLang":"en"}]},{"creatorNames":[{"creatorName":"Nishida, Keiya","creatorNameLang":"en"}],"familyNames":[{"familyName":"Nishida","familyNameLang":"en"}],"givenNames":[{"givenName":"Keiya","givenNameLang":"en"}]},{"creatorNames":[{"creatorName":"Ogata, Yoichi","creatorNameLang":"en"}],"familyNames":[{"familyName":"Ogata","familyNameLang":"en"}],"givenNames":[{"givenName":"Yoichi","givenNameLang":"en"}]}]},"item_1617186476635":{"attribute_name":"Access Rights","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_1617186499011":{"attribute_name":"Rights","attribute_value_mlt":[{"subitem_rights":"This is a post-peer-review, pre-copyedit version of an article published in Flow, Turbulence and Combustion. The final authenticated version is available online at: https://doi.org/10.1007/s10494-019-00088-y."},{"subitem_rights":"This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。"}]},"item_1617186609386":{"attribute_name":"Subject","attribute_value_mlt":[{"subitem_subject":"Turbulence","subitem_subject_scheme":"Other"},{"subitem_subject":"Pulsatile flow","subitem_subject_scheme":"Other"},{"subitem_subject":"Secondary flow","subitem_subject_scheme":"Other"},{"subitem_subject":"Particle image velocimetry","subitem_subject_scheme":"Other"},{"subitem_subject":"Swirl switching","subitem_subject_scheme":"Other"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"We investigate turbulent flow with highly pulsating axial velocity passing through a duct with both first and second bends. The time-dependent velocity fields downstream of the bends were measured using time-resolved stereo particle image velocimetry for the steady case (Reynolds number Re = 36,700) and the pulsatile case (Re = 37,800 and Womersley number α = 59.1). Proper orthogonal decomposition (POD) of the in-plane velocity data isolates the energetic structures of the secondary flow. The modes downstream of the first bend have a Dean motion (mode 0), single swirl (mode 1), and double swirl (mode 2), which agree with those of previous studies on steady turbulent flow. Downstream of the second bend, additional vortices appear in the modes owing to the secondary flow originating in the first bend. The modal structure of the pulsatile case is virtually the same as that of the steady case. To our knowledge, we are the first to find swirl switching in pulsatile flow, whereas the switching has been reported only for steady cases. We further conduct a time-frequency analysis via wavelet transformation onto the POD time coefficient, showing intermittency in energy of the mode associated with swirl switching.","subitem_description_language":"en"},{"subitem_description":"This work was partially supported by a research grant from The Hiroshima University Education and Research Support Foundation.","subitem_description_type":"Other"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_publisher":"Springer"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_1617186920753":{"attribute_name":"Source Identifier","attribute_value_mlt":[{"subitem_source_identifier":"1386-6184","subitem_source_identifier_type":"ISSN"},{"subitem_source_identifier":"1573-1987","subitem_source_identifier_type":"ISSN"}]},"item_1617187024783":{"attribute_name":"Page Start","attribute_value_mlt":[{"subitem_start_page":"817"}]},"item_1617187056579":{"attribute_name":"Bibliographic Information","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2020-04","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"833","bibliographicPageStart":"817","bibliographicVolumeNumber":"104","bibliographic_titles":[{"bibliographic_title":"Flow, Turbulence and Combustion"},{"bibliographic_title":"Flow, Turbulence and Combustion"}]}]},"item_1617258105262":{"attribute_name":"Resource Type","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_1617265215918":{"attribute_name":"Version Type","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_b1a7d7d4d402bcce","subitem_version_type":"AO"}]},"item_1617353299429":{"attribute_name":"Relation","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"10.1007/s10494-019-00088-y","subitem_relation_type_select":"DOI"}},{"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://doi.org/10.1007/s10494-019-00088-y","subitem_relation_type_select":"DOI"}}]},"item_1617605131499":{"attribute_name":"File","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2023-03-18"}],"displaytype":"simple","filename":"FlowTurbulComb_104_817.pdf","filesize":[{"value":"1.5 MB"}],"mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://hiroshima.repo.nii.ac.jp/record/2006889/files/FlowTurbulComb_104_817.pdf"},"version_id":"2319722a-ca02-43b4-b335-75b412330021"}]},"item_1732771732025":{"attribute_name":"旧ID","attribute_value":"51063"},"item_title":"Unsteady Secondary Motion of Pulsatile Turbulent Flow through a Double 90°-Bend Duct","item_type_id":"40003","owner":"41","path":["1730444907710"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-03-18"},"publish_date":"2023-03-18","publish_status":"0","recid":"2006889","relation_version_is_last":true,"title":["Unsteady Secondary Motion of Pulsatile Turbulent Flow through a Double 90°-Bend Duct"],"weko_creator_id":"41","weko_shared_id":-1},"updated":"2025-02-21T08:38:40.495108+00:00"}