Influence of Right Triangular Prism Rough Beds on Hydraulic Jumps
A hydraulic jump phenomenon is exciting in turbulent flow as it causes large-scale turbulence and high-energy loss. This paper investigates the hydraulic jump characteristics of right triangular prism rough beds. The renormalization group RNG <i>k</i>-<i>ε</i> turbulent model...
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MDPI AG
2024-01-01
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| Online Access: | https://www.mdpi.com/2076-3417/14/2/594 |
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| author | Cong Ty Trinh Jianmin Zhang Cong Trieu Tran |
| author_facet | Cong Ty Trinh Jianmin Zhang Cong Trieu Tran |
| author_sort | Cong Ty Trinh |
| collection | DOAJ |
| description | A hydraulic jump phenomenon is exciting in turbulent flow as it causes large-scale turbulence and high-energy loss. This paper investigates the hydraulic jump characteristics of right triangular prism rough beds. The renormalization group RNG <i>k</i>-<i>ε</i> turbulent model and the volume of fluid (VOF) method in a CFD model are utilized to simulate hydraulic jumps. A total of 210 numerical simulations of four new types of rough beds were performed with an initial Froude number (<i>Fr</i><sub>1</sub>) ranging from 4.8 to 9.4, the non-dimensionless wave steepness values of 0.67 ≤ <i>t</i>/<i>s</i> ≤ 1.33, and the distances between roughness elements of 0 ≤ <i>L</i><sub>s</sub>/<i>y</i><sub>1</sub> ≤ 2.67. This study found that arranging the right triangular prism rough elements in a stilling basin increased bed shear stress and energy loss. At the same time, they reduced sequent depth and jump length by about 22% and 50% compared to a smooth bed, respectively. In addition, the entropy production rates are also used to analyze energy dissipation, which clearly shows that the characteristic shape of a rough bed significantly influences the hydraulic jump length. Equations and plots that specify the relationships between the hydraulic jumps and study parameters are helpful guidelines for defining the rough bed dimension when designing or repairing a stilling basin for low-head irrigation works and highway sewers. |
| first_indexed | 2024-03-08T09:58:51Z |
| format | Article |
| id | doaj.art-7fcc6b3f062e43588947126da9151d3e |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-08T09:58:51Z |
| publishDate | 2024-01-01 |
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| spelling | doaj.art-7fcc6b3f062e43588947126da9151d3e2024-01-29T13:42:58ZengMDPI AGApplied Sciences2076-34172024-01-0114259410.3390/app14020594Influence of Right Triangular Prism Rough Beds on Hydraulic JumpsCong Ty Trinh0Jianmin Zhang1Cong Trieu Tran2State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, ChinaHydraulic Engineering Department, Hanoi University of Civil Engineering, 55 Giai Phong, Hanoi 12400, VietnamA hydraulic jump phenomenon is exciting in turbulent flow as it causes large-scale turbulence and high-energy loss. This paper investigates the hydraulic jump characteristics of right triangular prism rough beds. The renormalization group RNG <i>k</i>-<i>ε</i> turbulent model and the volume of fluid (VOF) method in a CFD model are utilized to simulate hydraulic jumps. A total of 210 numerical simulations of four new types of rough beds were performed with an initial Froude number (<i>Fr</i><sub>1</sub>) ranging from 4.8 to 9.4, the non-dimensionless wave steepness values of 0.67 ≤ <i>t</i>/<i>s</i> ≤ 1.33, and the distances between roughness elements of 0 ≤ <i>L</i><sub>s</sub>/<i>y</i><sub>1</sub> ≤ 2.67. This study found that arranging the right triangular prism rough elements in a stilling basin increased bed shear stress and energy loss. At the same time, they reduced sequent depth and jump length by about 22% and 50% compared to a smooth bed, respectively. In addition, the entropy production rates are also used to analyze energy dissipation, which clearly shows that the characteristic shape of a rough bed significantly influences the hydraulic jump length. Equations and plots that specify the relationships between the hydraulic jumps and study parameters are helpful guidelines for defining the rough bed dimension when designing or repairing a stilling basin for low-head irrigation works and highway sewers.https://www.mdpi.com/2076-3417/14/2/594CFD methodentropy productionhydraulic jumpsrough beds |
| spellingShingle | Cong Ty Trinh Jianmin Zhang Cong Trieu Tran Influence of Right Triangular Prism Rough Beds on Hydraulic Jumps Applied Sciences CFD method entropy production hydraulic jumps rough beds |
| title | Influence of Right Triangular Prism Rough Beds on Hydraulic Jumps |
| title_full | Influence of Right Triangular Prism Rough Beds on Hydraulic Jumps |
| title_fullStr | Influence of Right Triangular Prism Rough Beds on Hydraulic Jumps |
| title_full_unstemmed | Influence of Right Triangular Prism Rough Beds on Hydraulic Jumps |
| title_short | Influence of Right Triangular Prism Rough Beds on Hydraulic Jumps |
| title_sort | influence of right triangular prism rough beds on hydraulic jumps |
| topic | CFD method entropy production hydraulic jumps rough beds |
| url | https://www.mdpi.com/2076-3417/14/2/594 |
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