A numerical study of bodies in low reynolds number and their comparison in moving and stationary frames
The thesis aims to compare the results of numerical simulation of fluid dynamics in moving and stationary frames. Three flow configurations were tested, namely a flat plate, a NACA0009 aerofoil and a cylinder, essentially changing from thin to bluff body types. The flow domain and the body mesh are...
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| Format: | Thesis-Master by Coursework |
| Language: | English |
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Nanyang Technological University
2020
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| Online Access: | https://hdl.handle.net/10356/136983 |
| _version_ | 1811697245634953216 |
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| author | Maitreya Mukherjee |
| author2 | Chan Wai Lee |
| author_facet | Chan Wai Lee Maitreya Mukherjee |
| author_sort | Maitreya Mukherjee |
| collection | NTU |
| description | The thesis aims to compare the results of numerical simulation of fluid dynamics in moving and stationary frames. Three flow configurations were tested, namely a flat plate, a NACA0009 aerofoil and a cylinder, essentially changing from thin to bluff body types. The flow domain and the body mesh are meshed separately and combined using the overset technique. In the stationary frame, the body mesh is held stationary while the flow is moving. Conversely, in the moving frame the body moves in a quiescent flow. All cases were performed at Reynolds number of 400.
The results for each of the three different stationary cases were compared with their respective moving cases. The results for the flat plate and aerofoil for both the moving and stationary frames were in reasonable agreement. The discrepancy arose for the cylinder, where the drag for the stationary case was approximately twice of that of the moving case. Further analysis indicates that pressure drag is the dominant factor of the discrepancy, suggesting that the fluid dynamics of bluff bodies in moving frame may not be accurately transferred into the stationary frame. This is contrary to what is expected from the the invariant nature of the Navier-Stokes equation. |
| first_indexed | 2024-10-01T07:52:12Z |
| format | Thesis-Master by Coursework |
| id | ntu-10356/136983 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:52:12Z |
| publishDate | 2020 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1369832023-03-11T17:43:37Z A numerical study of bodies in low reynolds number and their comparison in moving and stationary frames Maitreya Mukherjee Chan Wai Lee School of Mechanical and Aerospace Engineering chan.wl@ntu.edu.sg Engineering::Aeronautical engineering Engineering::Mechanical engineering::Fluid mechanics The thesis aims to compare the results of numerical simulation of fluid dynamics in moving and stationary frames. Three flow configurations were tested, namely a flat plate, a NACA0009 aerofoil and a cylinder, essentially changing from thin to bluff body types. The flow domain and the body mesh are meshed separately and combined using the overset technique. In the stationary frame, the body mesh is held stationary while the flow is moving. Conversely, in the moving frame the body moves in a quiescent flow. All cases were performed at Reynolds number of 400. The results for each of the three different stationary cases were compared with their respective moving cases. The results for the flat plate and aerofoil for both the moving and stationary frames were in reasonable agreement. The discrepancy arose for the cylinder, where the drag for the stationary case was approximately twice of that of the moving case. Further analysis indicates that pressure drag is the dominant factor of the discrepancy, suggesting that the fluid dynamics of bluff bodies in moving frame may not be accurately transferred into the stationary frame. This is contrary to what is expected from the the invariant nature of the Navier-Stokes equation. Master of Science (Aerospace Engineering) 2020-02-10T05:59:37Z 2020-02-10T05:59:37Z 2019 Thesis-Master by Coursework https://hdl.handle.net/10356/136983 en application/pdf Nanyang Technological University |
| spellingShingle | Engineering::Aeronautical engineering Engineering::Mechanical engineering::Fluid mechanics Maitreya Mukherjee A numerical study of bodies in low reynolds number and their comparison in moving and stationary frames |
| title | A numerical study of bodies in low reynolds number and their comparison in moving and stationary frames |
| title_full | A numerical study of bodies in low reynolds number and their comparison in moving and stationary frames |
| title_fullStr | A numerical study of bodies in low reynolds number and their comparison in moving and stationary frames |
| title_full_unstemmed | A numerical study of bodies in low reynolds number and their comparison in moving and stationary frames |
| title_short | A numerical study of bodies in low reynolds number and their comparison in moving and stationary frames |
| title_sort | numerical study of bodies in low reynolds number and their comparison in moving and stationary frames |
| topic | Engineering::Aeronautical engineering Engineering::Mechanical engineering::Fluid mechanics |
| url | https://hdl.handle.net/10356/136983 |
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