Decay of Vorticity in Separated Shear Layer
In this study, process of vorticity decay caused by viscous interaction in a separated shear layer was investigated based on velocity measurements and flow visualization in the immediate vicinity of the separation point of a test body. The experiment was carried out at a fixed Reynolds number of 19,...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2010-06-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/5/2/5_2_331/_pdf/-char/en |
| _version_ | 1819364502663069696 |
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| author | Katsumi MIYAKOSHI Hiroyuki HANIU Sangil KIM Kazunori TAKAI Mohammad Rofiqul ISLAM |
| author_facet | Katsumi MIYAKOSHI Hiroyuki HANIU Sangil KIM Kazunori TAKAI Mohammad Rofiqul ISLAM |
| author_sort | Katsumi MIYAKOSHI |
| collection | DOAJ |
| description | In this study, process of vorticity decay caused by viscous interaction in a separated shear layer was investigated based on velocity measurements and flow visualization in the immediate vicinity of the separation point of a test body. The experiment was carried out at a fixed Reynolds number of 19,000. The research results innovate the important aspects of clarification on vorticity decay including i) part of the vorticity in the separated shear layer behind a body are caused by viscous interaction associated with transition of velocity distribution from boundary layer like shape to free shear layer like shape in the immediate vicinity of the separation point; ii) Reynolds shear stress associated with turbulent diffusion is not concerned in the vorticity decay process in the immediate vicinity of the separation point; iii) since the Reynolds shear stress around an intermediate size vortex produced by pairing of smaller vortices is considerably large, the flow field becomes turbulent and three dimensional. |
| first_indexed | 2024-12-24T22:59:58Z |
| format | Article |
| id | doaj.art-cef4e42f62c0479d927f789eee1953a5 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-24T22:59:58Z |
| publishDate | 2010-06-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-cef4e42f62c0479d927f789eee1953a52022-12-21T16:35:09ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582010-06-015233133910.1299/jfst.5.331jfstDecay of Vorticity in Separated Shear LayerKatsumi MIYAKOSHI0Hiroyuki HANIU1Sangil KIM2Kazunori TAKAI3Mohammad Rofiqul ISLAM4Department of Mechanical Engineering, Kitami Institute of TechnologyDepartment of Mechanical Engineering, Kitami Institute of TechnologyAishin Seiki Co. LtdDepartment of Mechanical Engineering, Kitami Institute of TechnologyDepartment of Mechanical Engineering, Rajshahi University of Engineering & TechnologyIn this study, process of vorticity decay caused by viscous interaction in a separated shear layer was investigated based on velocity measurements and flow visualization in the immediate vicinity of the separation point of a test body. The experiment was carried out at a fixed Reynolds number of 19,000. The research results innovate the important aspects of clarification on vorticity decay including i) part of the vorticity in the separated shear layer behind a body are caused by viscous interaction associated with transition of velocity distribution from boundary layer like shape to free shear layer like shape in the immediate vicinity of the separation point; ii) Reynolds shear stress associated with turbulent diffusion is not concerned in the vorticity decay process in the immediate vicinity of the separation point; iii) since the Reynolds shear stress around an intermediate size vortex produced by pairing of smaller vortices is considerably large, the flow field becomes turbulent and three dimensional.https://www.jstage.jst.go.jp/article/jfst/5/2/5_2_331/_pdf/-char/enshear flowseparationviscous flowflow measurementsflow visualizationvorticity decaytransition |
| spellingShingle | Katsumi MIYAKOSHI Hiroyuki HANIU Sangil KIM Kazunori TAKAI Mohammad Rofiqul ISLAM Decay of Vorticity in Separated Shear Layer Journal of Fluid Science and Technology shear flow separation viscous flow flow measurements flow visualization vorticity decay transition |
| title | Decay of Vorticity in Separated Shear Layer |
| title_full | Decay of Vorticity in Separated Shear Layer |
| title_fullStr | Decay of Vorticity in Separated Shear Layer |
| title_full_unstemmed | Decay of Vorticity in Separated Shear Layer |
| title_short | Decay of Vorticity in Separated Shear Layer |
| title_sort | decay of vorticity in separated shear layer |
| topic | shear flow separation viscous flow flow measurements flow visualization vorticity decay transition |
| url | https://www.jstage.jst.go.jp/article/jfst/5/2/5_2_331/_pdf/-char/en |
| work_keys_str_mv | AT katsumimiyakoshi decayofvorticityinseparatedshearlayer AT hiroyukihaniu decayofvorticityinseparatedshearlayer AT sangilkim decayofvorticityinseparatedshearlayer AT kazunoritakai decayofvorticityinseparatedshearlayer AT mohammadrofiqulislam decayofvorticityinseparatedshearlayer |