Discrete Vortex Prediction of Flows around a Cylinder Near a Wall Using Overlapping Grid System
Modelling of unidirectional and oscillatory flows around a cylinder near a wall using an overlapping grid system is carried out. The circular grid system of the cylinder was overlapped with the rectangular grid system of the wall. The use of such an overlapping grid system is intended to reduce the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-06-01
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| Series: | Fluids |
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| Online Access: | https://www.mdpi.com/2311-5521/6/6/211 |
| _version_ | 1797531029239496704 |
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| author | Wisnu Wardhana Ede Mehta Wardhana Meitha Soetardjo |
| author_facet | Wisnu Wardhana Ede Mehta Wardhana Meitha Soetardjo |
| author_sort | Wisnu Wardhana |
| collection | DOAJ |
| description | Modelling of unidirectional and oscillatory flows around a cylinder near a wall using an overlapping grid system is carried out. The circular grid system of the cylinder was overlapped with the rectangular grid system of the wall. The use of such an overlapping grid system is intended to reduce the CPU time compared to the cloud scheme in which vortex-to-vortex interaction is used, i.e., especially in calculating the shedding vortex velocity, since calculating the vortices velocity takes the longest CPU time. This method is not only time efficient, but also gives a better distribution of surface vorticity as the scattered vortices around the body are now concentrated on a grid point. Therefore, grid-to-grid interaction is used instead of vortex-to-vortex interaction. Velocity calculation was also carried out using this overlapping grid in which the new incremental shift position was summed up to obtain the total new vortices position. The engineering applications of this topic are to simulate the loading of submarine pipeline placed close to the seabed or to simulate the flow as a result of the scouring process below the cylinder since there is space for the fluid to flow beneath it. The in-line and transverse force coefficients are found by integrating the pressure around the cylinder surface. The flow patterns are then obtained and presented. The comparison of the results with experimental evidence is presented and the range of good results is discussed. |
| first_indexed | 2024-03-10T10:37:21Z |
| format | Article |
| id | doaj.art-a95a06c010de4c44a001246fbbc92b57 |
| institution | Directory Open Access Journal |
| issn | 2311-5521 |
| language | English |
| last_indexed | 2024-03-10T10:37:21Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj.art-a95a06c010de4c44a001246fbbc92b572023-11-21T23:11:59ZengMDPI AGFluids2311-55212021-06-016621110.3390/fluids6060211Discrete Vortex Prediction of Flows around a Cylinder Near a Wall Using Overlapping Grid SystemWisnu Wardhana0Ede Mehta Wardhana1Meitha Soetardjo2Ocean Engineering Department, Institut Teknologi Sepuluh Nopember, Surabaya 60111, IndonesiaMarine Engineering Department, Institut Teknologi Sepuluh Nopember, Surabaya 60111, IndonesiaIndonesian Hydrodynamic Laboratory, BPPT, Surabaya 60111, IndonesiaModelling of unidirectional and oscillatory flows around a cylinder near a wall using an overlapping grid system is carried out. The circular grid system of the cylinder was overlapped with the rectangular grid system of the wall. The use of such an overlapping grid system is intended to reduce the CPU time compared to the cloud scheme in which vortex-to-vortex interaction is used, i.e., especially in calculating the shedding vortex velocity, since calculating the vortices velocity takes the longest CPU time. This method is not only time efficient, but also gives a better distribution of surface vorticity as the scattered vortices around the body are now concentrated on a grid point. Therefore, grid-to-grid interaction is used instead of vortex-to-vortex interaction. Velocity calculation was also carried out using this overlapping grid in which the new incremental shift position was summed up to obtain the total new vortices position. The engineering applications of this topic are to simulate the loading of submarine pipeline placed close to the seabed or to simulate the flow as a result of the scouring process below the cylinder since there is space for the fluid to flow beneath it. The in-line and transverse force coefficients are found by integrating the pressure around the cylinder surface. The flow patterns are then obtained and presented. The comparison of the results with experimental evidence is presented and the range of good results is discussed.https://www.mdpi.com/2311-5521/6/6/211cylinderwalldiscrete vortexoverlapping grid |
| spellingShingle | Wisnu Wardhana Ede Mehta Wardhana Meitha Soetardjo Discrete Vortex Prediction of Flows around a Cylinder Near a Wall Using Overlapping Grid System Fluids cylinder wall discrete vortex overlapping grid |
| title | Discrete Vortex Prediction of Flows around a Cylinder Near a Wall Using Overlapping Grid System |
| title_full | Discrete Vortex Prediction of Flows around a Cylinder Near a Wall Using Overlapping Grid System |
| title_fullStr | Discrete Vortex Prediction of Flows around a Cylinder Near a Wall Using Overlapping Grid System |
| title_full_unstemmed | Discrete Vortex Prediction of Flows around a Cylinder Near a Wall Using Overlapping Grid System |
| title_short | Discrete Vortex Prediction of Flows around a Cylinder Near a Wall Using Overlapping Grid System |
| title_sort | discrete vortex prediction of flows around a cylinder near a wall using overlapping grid system |
| topic | cylinder wall discrete vortex overlapping grid |
| url | https://www.mdpi.com/2311-5521/6/6/211 |
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