Modulation of the recirculation region due to magneto hydrodynamic flow
Turbulent flow characteristics on the fully submerged square rib are dominated by large scale flow structures. Flow separation, recirculation and reattachment region at the wake region of rib composes the vortex shading which may generate unwanted vibrations. The present numerical simulation focused...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-02-01
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| Series: | Engineering Science and Technology, an International Journal |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2215098618309042 |
| _version_ | 1818415897708068864 |
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| author | S. Roy S. Ghoshal K. Barman V.K. Das S. Ghosh K. Debnath |
| author_facet | S. Roy S. Ghoshal K. Barman V.K. Das S. Ghosh K. Debnath |
| author_sort | S. Roy |
| collection | DOAJ |
| description | Turbulent flow characteristics on the fully submerged square rib are dominated by large scale flow structures. Flow separation, recirculation and reattachment region at the wake region of rib composes the vortex shading which may generate unwanted vibrations. The present numerical simulation focused on the modulation of recirculation zone for the flow of Reynolds number (Re = 60,000) with different Hartmann numbers (Ha = 5, 25 and 50). The consequences of this study depict that the strength of the magnetic field in an average reduction of mean axial velocity in compared to the flow without magnetic field. Moreover, the induced magnetic field is capable of reducing the recirculation zone at the wake region of the square rib. The frontal recirculation area is rather amplified due to the induced magnetic field compared to the flow without magnetic field. Turbulence strength is reduced for higher Hartmann number. In addition, turbulent kinetic energy (TKE), dissipation and vorticity are analyzed to understand the turbulent flow field and its modulation around the square rib due to different Hartmann numbers. The TKE, vorticity and dissipation are maximized near the bottom wall at the wake region of the rib. Keywords: MHD, Hartmann number, k-ε model, Square rib, Open channel |
| first_indexed | 2024-12-14T11:42:18Z |
| format | Article |
| id | doaj.art-b185f7d90dc14614a8537648c6032585 |
| institution | Directory Open Access Journal |
| issn | 2215-0986 |
| language | English |
| last_indexed | 2024-12-14T11:42:18Z |
| publishDate | 2019-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Engineering Science and Technology, an International Journal |
| spelling | doaj.art-b185f7d90dc14614a8537648c60325852022-12-21T23:02:46ZengElsevierEngineering Science and Technology, an International Journal2215-09862019-02-01221282293Modulation of the recirculation region due to magneto hydrodynamic flowS. Roy0S. Ghoshal1K. Barman2V.K. Das3S. Ghosh4K. Debnath5Fluid Mechanics and Hydraulic Laboratory (FMHL), Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology (IIEST), Shibpur 711103, IndiaFluid Mechanics and Hydraulic Laboratory (FMHL), Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology (IIEST), Shibpur 711103, IndiaApplied Mathematics with Oceanology and Computer Programming, Vidyasagar University, Paschim Medinipur 721102, West Bengal, India; Corresponding author.Fluid Mechanics and Hydraulic Laboratory (FMHL), Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology (IIEST), Shibpur 711103, IndiaFluid Mechanics and Hydraulic Laboratory (FMHL), Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology (IIEST), Shibpur 711103, IndiaFluid Mechanics and Hydraulic Laboratory (FMHL), Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology (IIEST), Shibpur 711103, IndiaTurbulent flow characteristics on the fully submerged square rib are dominated by large scale flow structures. Flow separation, recirculation and reattachment region at the wake region of rib composes the vortex shading which may generate unwanted vibrations. The present numerical simulation focused on the modulation of recirculation zone for the flow of Reynolds number (Re = 60,000) with different Hartmann numbers (Ha = 5, 25 and 50). The consequences of this study depict that the strength of the magnetic field in an average reduction of mean axial velocity in compared to the flow without magnetic field. Moreover, the induced magnetic field is capable of reducing the recirculation zone at the wake region of the square rib. The frontal recirculation area is rather amplified due to the induced magnetic field compared to the flow without magnetic field. Turbulence strength is reduced for higher Hartmann number. In addition, turbulent kinetic energy (TKE), dissipation and vorticity are analyzed to understand the turbulent flow field and its modulation around the square rib due to different Hartmann numbers. The TKE, vorticity and dissipation are maximized near the bottom wall at the wake region of the rib. Keywords: MHD, Hartmann number, k-ε model, Square rib, Open channelhttp://www.sciencedirect.com/science/article/pii/S2215098618309042 |
| spellingShingle | S. Roy S. Ghoshal K. Barman V.K. Das S. Ghosh K. Debnath Modulation of the recirculation region due to magneto hydrodynamic flow Engineering Science and Technology, an International Journal |
| title | Modulation of the recirculation region due to magneto hydrodynamic flow |
| title_full | Modulation of the recirculation region due to magneto hydrodynamic flow |
| title_fullStr | Modulation of the recirculation region due to magneto hydrodynamic flow |
| title_full_unstemmed | Modulation of the recirculation region due to magneto hydrodynamic flow |
| title_short | Modulation of the recirculation region due to magneto hydrodynamic flow |
| title_sort | modulation of the recirculation region due to magneto hydrodynamic flow |
| url | http://www.sciencedirect.com/science/article/pii/S2215098618309042 |
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