Numerical simulation of flow control around a circular cylinder by installing a wedge-shaped device upstream
The effect of a triangular wedge upstream of a circular cylinder has been investigated, and the findings are presented herein. The triangular wedge is equilateral in plan form, and the Reynolds number based on the diameter of the main cylinder is approximately 200. Contours of vorticity clearly show...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/148657 |
| _version_ | 1826119624107753472 |
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| author | Han, Xiaoshuang Wang, Jie Zhou, Bo Zhang, Guiyong Tan, Soon-Keat |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Han, Xiaoshuang Wang, Jie Zhou, Bo Zhang, Guiyong Tan, Soon-Keat |
| author_sort | Han, Xiaoshuang |
| collection | NTU |
| description | The effect of a triangular wedge upstream of a circular cylinder has been investigated, and the findings are presented herein. The triangular wedge is equilateral in plan form, and the Reynolds number based on the diameter of the main cylinder is approximately 200. Contours of vorticity clearly show that two entirely different wake patterns exist between the wedge and the main cylinder. There also exists a critical spacing ratio and side length ratio at which the wake flow pattern shifts from one within the cavity mode to one within the wake impingement mode. For a relatively small side length ratio of lω/D = 0.20 and 0.27, where the side length refers to the length of one side of the triangular wedge, the drag and lift coefficients decrease monotonically with the spacing ratio. There is a sudden jump of the drag and lift coefficients at larger side length ratios of lω/D = 0.33 and 0.40. This study shows that at a spacing ratio of L/D = 2.8 (where L is the distance between the vertex of the wedge and the center of the cylinder) and a wedge side length of lω/D = 0.40, the reduction of the amplitude of lift and mean drag coefficient on the main cylinder are 71.9% and 60.1%, respectively. |
| first_indexed | 2024-10-01T05:03:28Z |
| format | Journal Article |
| id | ntu-10356/148657 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:03:28Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1486572021-05-31T07:26:57Z Numerical simulation of flow control around a circular cylinder by installing a wedge-shaped device upstream Han, Xiaoshuang Wang, Jie Zhou, Bo Zhang, Guiyong Tan, Soon-Keat School of Civil and Environmental Engineering Engineering::Civil engineering Flow Control Drag Reduction The effect of a triangular wedge upstream of a circular cylinder has been investigated, and the findings are presented herein. The triangular wedge is equilateral in plan form, and the Reynolds number based on the diameter of the main cylinder is approximately 200. Contours of vorticity clearly show that two entirely different wake patterns exist between the wedge and the main cylinder. There also exists a critical spacing ratio and side length ratio at which the wake flow pattern shifts from one within the cavity mode to one within the wake impingement mode. For a relatively small side length ratio of lω/D = 0.20 and 0.27, where the side length refers to the length of one side of the triangular wedge, the drag and lift coefficients decrease monotonically with the spacing ratio. There is a sudden jump of the drag and lift coefficients at larger side length ratios of lω/D = 0.33 and 0.40. This study shows that at a spacing ratio of L/D = 2.8 (where L is the distance between the vertex of the wedge and the center of the cylinder) and a wedge side length of lω/D = 0.40, the reduction of the amplitude of lift and mean drag coefficient on the main cylinder are 71.9% and 60.1%, respectively. Published version 2021-05-31T07:26:57Z 2021-05-31T07:26:57Z 2019 Journal Article Han, X., Wang, J., Zhou, B., Zhang, G. & Tan, S. (2019). Numerical simulation of flow control around a circular cylinder by installing a wedge-shaped device upstream. Journal of Marine Science and Engineering, 7(12). https://dx.doi.org/10.3390/JMSE7120422 2077-1312 https://hdl.handle.net/10356/148657 10.3390/JMSE7120422 2-s2.0-85082842014 12 7 en Journal of Marine Science and Engineering © 2019 The Author(s). Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). application/pdf |
| spellingShingle | Engineering::Civil engineering Flow Control Drag Reduction Han, Xiaoshuang Wang, Jie Zhou, Bo Zhang, Guiyong Tan, Soon-Keat Numerical simulation of flow control around a circular cylinder by installing a wedge-shaped device upstream |
| title | Numerical simulation of flow control around a circular cylinder by installing a wedge-shaped device upstream |
| title_full | Numerical simulation of flow control around a circular cylinder by installing a wedge-shaped device upstream |
| title_fullStr | Numerical simulation of flow control around a circular cylinder by installing a wedge-shaped device upstream |
| title_full_unstemmed | Numerical simulation of flow control around a circular cylinder by installing a wedge-shaped device upstream |
| title_short | Numerical simulation of flow control around a circular cylinder by installing a wedge-shaped device upstream |
| title_sort | numerical simulation of flow control around a circular cylinder by installing a wedge shaped device upstream |
| topic | Engineering::Civil engineering Flow Control Drag Reduction |
| url | https://hdl.handle.net/10356/148657 |
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