Numerical evaluation of turbulent flow in a circular conduit along a side weir
Abstract Side weir is used as a slot in the side wall of the main channel to direct excess water that is above the weir crest. Such structures are used in control of flow level in irrigation, drainage networks and urban sewage disposal systems. Furthermore, circular channels are pretty important bec...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2019-12-01
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| Series: | Applied Water Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s13201-019-1117-3 |
| _version_ | 1818920994156314624 |
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| author | Meysam Bagherifar Ayoub Emdadi Hamed Azimi Babak Sanahmadi Saeid Shabanlou |
| author_facet | Meysam Bagherifar Ayoub Emdadi Hamed Azimi Babak Sanahmadi Saeid Shabanlou |
| author_sort | Meysam Bagherifar |
| collection | DOAJ |
| description | Abstract Side weir is used as a slot in the side wall of the main channel to direct excess water that is above the weir crest. Such structures are used in control of flow level in irrigation, drainage networks and urban sewage disposal systems. Furthermore, circular channels are pretty important because considerable length of sewage disposal and transmission pipeline system is made of circular channels. In this study, changes inflow free surface, turbulence and flow field passing through a circular channel along a side weir are simulated. This means that for modeling the variations in flow free surface and the flow field turbulence, the volume-of-fluid scheme and RNG k–ε turbulence model are used, respectively. In order to validate the accuracy of the numerical model, the flow free surface changes along the side weir, the discharge coefficient of side weir, discharge of side weir, Froude number at upstream of the side weir and specific energy are compared with the experimental measurements. Comparison of simulation results with the experimental measurements shows high accuracy of CFD model. In other words, the root-mean-square error percent and the mean absolute error for flow free surface are, respectively, obtained to be 0.554% and 0.547%. Moreover, average difference between the specific energy at upstream and downstream of the side weir is calculated about 2.1%. The main purpose of this simulation is gaining an understanding of behavior of the passing flow through circular channels with side weir for subcritical flow regime. |
| first_indexed | 2024-12-20T01:30:35Z |
| format | Article |
| id | doaj.art-6857f208f416426aafe31fb5b9abc14c |
| institution | Directory Open Access Journal |
| issn | 2190-5487 2190-5495 |
| language | English |
| last_indexed | 2024-12-20T01:30:35Z |
| publishDate | 2019-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Applied Water Science |
| spelling | doaj.art-6857f208f416426aafe31fb5b9abc14c2022-12-21T19:58:08ZengSpringerOpenApplied Water Science2190-54872190-54952019-12-011011910.1007/s13201-019-1117-3Numerical evaluation of turbulent flow in a circular conduit along a side weirMeysam Bagherifar0Ayoub Emdadi1Hamed Azimi2Babak Sanahmadi3Saeid Shabanlou4Department of Civil Engineering, Shushtar Branch, Islamic Azad UniversityDepartment of Civil Engineering, Hamadan Branch, Islamic Azad UniversityDepartment of Civil Engineering, Water and Wastewater Research Center, Razi UniversityDepartment of Water Engineering, Faculty of Agriculture, Bu-Ali Sina UniversityDepartment of Water Engineering, Kermanshah Branch, Islamic Azad UniversityAbstract Side weir is used as a slot in the side wall of the main channel to direct excess water that is above the weir crest. Such structures are used in control of flow level in irrigation, drainage networks and urban sewage disposal systems. Furthermore, circular channels are pretty important because considerable length of sewage disposal and transmission pipeline system is made of circular channels. In this study, changes inflow free surface, turbulence and flow field passing through a circular channel along a side weir are simulated. This means that for modeling the variations in flow free surface and the flow field turbulence, the volume-of-fluid scheme and RNG k–ε turbulence model are used, respectively. In order to validate the accuracy of the numerical model, the flow free surface changes along the side weir, the discharge coefficient of side weir, discharge of side weir, Froude number at upstream of the side weir and specific energy are compared with the experimental measurements. Comparison of simulation results with the experimental measurements shows high accuracy of CFD model. In other words, the root-mean-square error percent and the mean absolute error for flow free surface are, respectively, obtained to be 0.554% and 0.547%. Moreover, average difference between the specific energy at upstream and downstream of the side weir is calculated about 2.1%. The main purpose of this simulation is gaining an understanding of behavior of the passing flow through circular channels with side weir for subcritical flow regime.https://doi.org/10.1007/s13201-019-1117-3Circular channelSide weirNumerical simulationVOF schemeRNG k–ε model |
| spellingShingle | Meysam Bagherifar Ayoub Emdadi Hamed Azimi Babak Sanahmadi Saeid Shabanlou Numerical evaluation of turbulent flow in a circular conduit along a side weir Applied Water Science Circular channel Side weir Numerical simulation VOF scheme RNG k–ε model |
| title | Numerical evaluation of turbulent flow in a circular conduit along a side weir |
| title_full | Numerical evaluation of turbulent flow in a circular conduit along a side weir |
| title_fullStr | Numerical evaluation of turbulent flow in a circular conduit along a side weir |
| title_full_unstemmed | Numerical evaluation of turbulent flow in a circular conduit along a side weir |
| title_short | Numerical evaluation of turbulent flow in a circular conduit along a side weir |
| title_sort | numerical evaluation of turbulent flow in a circular conduit along a side weir |
| topic | Circular channel Side weir Numerical simulation VOF scheme RNG k–ε model |
| url | https://doi.org/10.1007/s13201-019-1117-3 |
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