Re-evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statistics
The free turbulent shear flow behind a long axisymmetric cylinder, i.e., a wake, is two-dimensional in nature and is composed of inner shear turbulence and outer potential, irrotational flow (free stream) regions. The conventional definitions of wake width, lu, are based on the mean velocity field,...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2014-09-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/9/3/9_2014jfst0035/_pdf/-char/en |
| _version_ | 1819364480661848064 |
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| author | Kuan-Huang LEE Keh-Chin CHANG |
| author_facet | Kuan-Huang LEE Keh-Chin CHANG |
| author_sort | Kuan-Huang LEE |
| collection | DOAJ |
| description | The free turbulent shear flow behind a long axisymmetric cylinder, i.e., a wake, is two-dimensional in nature and is composed of inner shear turbulence and outer potential, irrotational flow (free stream) regions. The conventional definitions of wake width, lu, are based on the mean velocity field, namely, the first order statistic of turbulence. Two alternative definitions of wake width, lS = 2yS and lF = 2yF, are proposed in terms of skewnes and flatness factors, respectively, which are considered as third- and fourth-order statistics of turbulence in this study. Between these two new definitions of wake width, lF can represent a more proper sectional range of shea turbulence in a wake. |
| first_indexed | 2024-12-24T22:59:37Z |
| format | Article |
| id | doaj.art-1566b9a9cd404f4f883dde238b28d400 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-24T22:59:37Z |
| publishDate | 2014-09-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-1566b9a9cd404f4f883dde238b28d4002022-12-21T16:35:10ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582014-09-0193JFST0035JFST003510.1299/jfst.2014jfst0035jfstRe-evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statisticsKuan-Huang LEE0Keh-Chin CHANG1Department of Aeronautics and Astronautics, National Cheng Kung UniversityDepartment of Aeronautics and Astronautics, National Cheng Kung UniversityThe free turbulent shear flow behind a long axisymmetric cylinder, i.e., a wake, is two-dimensional in nature and is composed of inner shear turbulence and outer potential, irrotational flow (free stream) regions. The conventional definitions of wake width, lu, are based on the mean velocity field, namely, the first order statistic of turbulence. Two alternative definitions of wake width, lS = 2yS and lF = 2yF, are proposed in terms of skewnes and flatness factors, respectively, which are considered as third- and fourth-order statistics of turbulence in this study. Between these two new definitions of wake width, lF can represent a more proper sectional range of shea turbulence in a wake.https://www.jstage.jst.go.jp/article/jfst/9/3/9_2014jfst0035/_pdf/-char/enwake widthskewness factorflatness factorexperimental fluid mechanicsstatistics of turbulence |
| spellingShingle | Kuan-Huang LEE Keh-Chin CHANG Re-evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statistics Journal of Fluid Science and Technology wake width skewness factor flatness factor experimental fluid mechanics statistics of turbulence |
| title | Re-evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statistics |
| title_full | Re-evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statistics |
| title_fullStr | Re-evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statistics |
| title_full_unstemmed | Re-evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statistics |
| title_short | Re-evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statistics |
| title_sort | re evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statistics |
| topic | wake width skewness factor flatness factor experimental fluid mechanics statistics of turbulence |
| url | https://www.jstage.jst.go.jp/article/jfst/9/3/9_2014jfst0035/_pdf/-char/en |
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