Quadrant analysis of turbulence in a rectangular cavity with large aspect ratios
By using particle image velocimetry techniques, this paper presents new insights on the turbulence structure and time-averaged flows in a rectangular cavity with large aspect ratios. The three cavity aspect ratios (L=D, where L = cavity length, D = cavity depth) used in this study are 9.9, 13.0, and...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/137316 |
| _version_ | 1811689087948554240 |
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| author | Guan, Dawei Agarwal, Prakash Chiew, Yee-Meng |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Guan, Dawei Agarwal, Prakash Chiew, Yee-Meng |
| author_sort | Guan, Dawei |
| collection | NTU |
| description | By using particle image velocimetry techniques, this paper presents new insights on the turbulence structure and time-averaged flows in a rectangular cavity with large aspect ratios. The three cavity aspect ratios (L=D, where L = cavity length, D = cavity depth) used in this study are 9.9, 13.0, and 18.9. The time-averaged velocity fields and Reynolds shear stress distributions within the cavity show that the flow pattern and turbulence structures are strongly affected by the cavity aspect ratio. The quadrant dynamic analysis of velocity fluctuations on the cavity shear layers and cavity downstream edge for the three cavities is conducted. Considering all of the bursting events with hole size parameter, H = 0 in the measured planes, sweeps are found to have the highest probability of occurrence within the zone of the shear layer, and ejections dominate almost all of the areas within the cavity and a certain depth of flow immediately above the shear layer. For the highmagnitude events (H = 1), quadrant dominances are almost inverted for all of the measured planes. The quadrant shear stress distributions show that the opposing events are approximately balanced for these regions on the cavity shear layers and along the cavity downstream edge. |
| first_indexed | 2024-10-01T05:42:32Z |
| format | Journal Article |
| id | ntu-10356/137316 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:42:32Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1373162020-03-17T05:14:49Z Quadrant analysis of turbulence in a rectangular cavity with large aspect ratios Guan, Dawei Agarwal, Prakash Chiew, Yee-Meng School of Civil and Environmental Engineering Engineering::Civil engineering Turbulence Quadrant Analysis By using particle image velocimetry techniques, this paper presents new insights on the turbulence structure and time-averaged flows in a rectangular cavity with large aspect ratios. The three cavity aspect ratios (L=D, where L = cavity length, D = cavity depth) used in this study are 9.9, 13.0, and 18.9. The time-averaged velocity fields and Reynolds shear stress distributions within the cavity show that the flow pattern and turbulence structures are strongly affected by the cavity aspect ratio. The quadrant dynamic analysis of velocity fluctuations on the cavity shear layers and cavity downstream edge for the three cavities is conducted. Considering all of the bursting events with hole size parameter, H = 0 in the measured planes, sweeps are found to have the highest probability of occurrence within the zone of the shear layer, and ejections dominate almost all of the areas within the cavity and a certain depth of flow immediately above the shear layer. For the highmagnitude events (H = 1), quadrant dominances are almost inverted for all of the measured planes. The quadrant shear stress distributions show that the opposing events are approximately balanced for these regions on the cavity shear layers and along the cavity downstream edge. Accepted version 2020-03-17T05:14:49Z 2020-03-17T05:14:49Z 2018 Journal Article Guan, D., Agarwal, P., & Chiew, Y.-M. (2018). Quadrant analysis of turbulence in a rectangular cavity with large aspect ratios. Journal of Hydraulic Engineering, 144(7), 04018035-. doi:10.1061/(ASCE)HY.1943-7900.0001480 0733-9429 https://hdl.handle.net/10356/137316 10.1061/(ASCE)HY.1943-7900.0001480 2-s2.0-85046245926 7 144 en Journal of Hydraulic Engineering © 2018 ASCE. All rights reserved. This paper was published in Journal of Hydraulic Engineering and is made available with permission of ASCE. application/pdf |
| spellingShingle | Engineering::Civil engineering Turbulence Quadrant Analysis Guan, Dawei Agarwal, Prakash Chiew, Yee-Meng Quadrant analysis of turbulence in a rectangular cavity with large aspect ratios |
| title | Quadrant analysis of turbulence in a rectangular cavity with large aspect ratios |
| title_full | Quadrant analysis of turbulence in a rectangular cavity with large aspect ratios |
| title_fullStr | Quadrant analysis of turbulence in a rectangular cavity with large aspect ratios |
| title_full_unstemmed | Quadrant analysis of turbulence in a rectangular cavity with large aspect ratios |
| title_short | Quadrant analysis of turbulence in a rectangular cavity with large aspect ratios |
| title_sort | quadrant analysis of turbulence in a rectangular cavity with large aspect ratios |
| topic | Engineering::Civil engineering Turbulence Quadrant Analysis |
| url | https://hdl.handle.net/10356/137316 |
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