{"created":"2023-06-20T15:11:40.589438+00:00","id":41376,"links":{},"metadata":{"_buckets":{"deposit":"3fced6c6-6083-4753-bcdc-cea65b70df76"},"_deposit":{"created_by":1,"id":"41376","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"41376"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00041376","sets":["1887:1893","1896:1898:1913:1915"]},"author_link":["489766","489761","489763","489764","489765","489760","489767","489762"],"item_3_alternative_title_2":{"attribute_name":"その他のタイトル（英）","attribute_value_mlt":[{"subitem_alternative_title":"Investigation of natural transition in a flat plate boundary layer using hydrogen bubble method"}]},"item_3_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2000-12","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"54","bibliographicPageStart":"51","bibliographicVolumeNumber":"47","bibliographic_titles":[{"bibliographic_title":"航空宇宙技術研究所特別資料"},{"bibliographic_title":"Special Publication of National Aerospace Laboratory","bibliographic_titleLang":"en"}]}]},"item_3_description_14":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"27-28 Sept. 1999 (25th). 27-28 Mar. 2000 (26th)","subitem_description_type":"Other"}]},"item_3_description_15":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）（英）","attribute_value_mlt":[{"subitem_description":"27-28 Sept. 1999 (25th). 27-28 Mar. 2000 (26th)","subitem_description_type":"Other"}]},"item_3_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"主流乱れを条件として平板境界層における自然遷移を水素気泡についてPIV(粒子画像速度測定)手法を使って検討した。主流乱れの撹乱が境界層内に流れ方向に長く伸びた低速領域、いわゆるストリーク構造、を生成し、この構造が下流で発達してスパン方向のうねり運動を伴って乱流へと崩壊する。本研究は、非モーダル理論ではせん断流中における壁垂直方向の速度撹乱が、流れ方向に大きな速度撹乱を誘起すると説明している。リフトアップ機構の検討に焦点を当てた。流れ方向速度と壁垂直方向速度の時間-スパン方向の瞬間分布を求めるため、画像処理と立体画像から気泡の3次元的位置を検出するアルゴリズムを含む新規方法を開発した。本情報は、速度場におけるストリーク構造を可視化し、また自然遷移過程おけるリフトアップ機構を明らかにした。","subitem_description_type":"Abstract"}]},"item_3_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"Investigation of natural transition in a flat plate boundary layer subjected to free stream turbulence has been done using the PIV (Particle Image Velocimetry) technique for hydrogen bubbles. The disturbances of the free stream turbulence generate streamwise elongated regions of low streamwise velocity, so called streaky structures, in the boundary layer and this structures develop downstream and breakdown to turbulence with spanwise waviness motions. This study is focused on the investigation of the lift-up mechanism that explains in the non-modal theory that the wall-normal velocity disturbance in a shear flow induces the large streamwise velocity disturbance. A new method that includes image processing and algorithm to detect three-dimensional positions of bubbles from the stereo images has been developed to obtain instantaneous time-spanwise distributions of the streamwise velocity and the wall-normal velocity. This information makes the streaky structure visible in the velocity fields and reveals the lift-up mechanism in the natural transition process.","subitem_description_type":"Other"}]},"item_3_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: AA0028636016","subitem_description_type":"Other"}]},"item_3_description_33":{"attribute_name":"レポート番号","attribute_value_mlt":[{"subitem_description":"レポート番号: NAL SP-47","subitem_description_type":"Other"}]},"item_3_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"航空宇宙技術研究所"}]},"item_3_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"National Aerospace Laboratory (NAL)"}]},"item_3_source_id_21":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0289-260X","subitem_source_identifier_type":"ISSN"}]},"item_3_source_id_24":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN10097345","subitem_source_identifier_type":"NCID"}]},"item_3_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"信州大学"},{"subitem_text_value":"東北大学流体科学研究所"},{"subitem_text_value":"Royal Institute of Technology"},{"subitem_text_value":"東北大学流体科学研究所"}]},"item_3_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"Shinshu University"},{"subitem_text_language":"en","subitem_text_value":"Institute of Fluid Science, Tohoku University"},{"subitem_text_language":"en","subitem_text_value":"Royal Institute of Technology"},{"subitem_text_language":"en","subitem_text_value":"Institute of Fluid Science, Tohoku University"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"松原, 雅春"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"稲澤, 歩"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Lundell, Fredrik"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"小濱, 泰昭"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Matsubara, Masaharu","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Inasawa, Ayumu","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Lundell, Fredrik","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Kohama, Yasuaki","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-02-10"}],"displaytype":"detail","filename":"nalsp0047016.pdf","filesize":[{"value":"1.6 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"nalsp0047016.pdf","url":"https://jaxa.repo.nii.ac.jp/record/41376/files/nalsp0047016.pdf"},"version_id":"0ba55cdc-7fa8-436b-9c2e-a1d17d511f5a"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"平板境界層","subitem_subject_scheme":"Other"},{"subitem_subject":"自然遷移","subitem_subject_scheme":"Other"},{"subitem_subject":"水素気泡法","subitem_subject_scheme":"Other"},{"subitem_subject":"主流乱れ","subitem_subject_scheme":"Other"},{"subitem_subject":"過渡成長","subitem_subject_scheme":"Other"},{"subitem_subject":"PIV手法","subitem_subject_scheme":"Other"},{"subitem_subject":"粒子画像速度測定","subitem_subject_scheme":"Other"},{"subitem_subject":"低速度領域","subitem_subject_scheme":"Other"},{"subitem_subject":"ストリーク構造","subitem_subject_scheme":"Other"},{"subitem_subject":"うねり運動","subitem_subject_scheme":"Other"},{"subitem_subject":"リフトアップ機構","subitem_subject_scheme":"Other"},{"subitem_subject":"速度撹乱","subitem_subject_scheme":"Other"},{"subitem_subject":"画像処理","subitem_subject_scheme":"Other"},{"subitem_subject":"flat plate boundary layer","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"natural transition","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"hydrogen bubble method","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"free stream turbulence","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"transient growth","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"PIV technique","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"particle image velocimetry","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"low velocity region","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"streaky structure","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"waviness motion","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"liftup mechanism","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"velocity disturbance","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"image processing","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"technical report","resourceuri":"http://purl.org/coar/resource_type/c_18gh"}]},"item_title":"水素気泡法による平板境界層の自然遷移の観察","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"水素気泡法による平板境界層の自然遷移の観察"}]},"item_type_id":"3","owner":"1","path":["1893","1915"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"41376","relation_version_is_last":true,"title":["水素気泡法による平板境界層の自然遷移の観察"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-20T21:01:55.033679+00:00"}