CFD Investigation for Sonar Dome with Bulbous Bow Effect
The objective of this study is to design a hull-mounted sonar dome of a ship using OpenFOAM with a bulbous bow effect at cruise speed in calm water. Verification and validation for the original sonar dome simulation are conducted. Next, the 1.44 million grid size is selected to study different dome...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Inventions |
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| Online Access: | https://www.mdpi.com/2411-5134/8/2/58 |
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| author | Ping-Chen Wu Jiun-Yu Chen Chen-I Wu Jiun-Ting Lin |
| author_facet | Ping-Chen Wu Jiun-Yu Chen Chen-I Wu Jiun-Ting Lin |
| author_sort | Ping-Chen Wu |
| collection | DOAJ |
| description | The objective of this study is to design a hull-mounted sonar dome of a ship using OpenFOAM with a bulbous bow effect at cruise speed in calm water. Verification and validation for the original sonar dome simulation are conducted. Next, the 1.44 million grid size is selected to study different dome lengths. By protruding the dome forward 7.5% of the ship’s length, the optimal 17% resistance reduction is achieved and is mainly caused by the pressure resistance decrease. The optimal sonar dome not only functions in the same way as a bulbous bow, but the viscous flow behaviors are also improved. The protrusion corresponding to 90 deg phase lag reduces the bow wave amplitude. The flow acceleration outside the boundary layer and ship wake velocity are higher coinciding with the much lower total resistance. A smaller flow separation and thinner boundary layer are also observed behind the sonar dome because its back slope is less steep. The high pressure covers a smaller area around the bow, and the smaller bow wave crest does not hit the ship’s flare to form high pressure. Consequently, the lower high pressure on the dome front and higher low pressure on the dome back result in the decreases in pressure resistance. The vortical structures are also improved. |
| first_indexed | 2024-03-11T04:54:14Z |
| format | Article |
| id | doaj.art-a2a9ebaa67df45c68bad6eb0cc3d22dd |
| institution | Directory Open Access Journal |
| issn | 2411-5134 |
| language | English |
| last_indexed | 2024-03-11T04:54:14Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Inventions |
| spelling | doaj.art-a2a9ebaa67df45c68bad6eb0cc3d22dd2023-11-17T19:47:11ZengMDPI AGInventions2411-51342023-03-01825810.3390/inventions8020058CFD Investigation for Sonar Dome with Bulbous Bow EffectPing-Chen Wu0Jiun-Yu Chen1Chen-I Wu2Jiun-Ting Lin3Department of Systems and Naval Mechatronic Engineering, National Cheng Kung University, Tainan City 70101, TaiwanDepartment of Systems and Naval Mechatronic Engineering, National Cheng Kung University, Tainan City 70101, TaiwanDepartment of Systems and Naval Mechatronic Engineering, National Cheng Kung University, Tainan City 70101, TaiwanDepartment of Systems and Naval Mechatronic Engineering, National Cheng Kung University, Tainan City 70101, TaiwanThe objective of this study is to design a hull-mounted sonar dome of a ship using OpenFOAM with a bulbous bow effect at cruise speed in calm water. Verification and validation for the original sonar dome simulation are conducted. Next, the 1.44 million grid size is selected to study different dome lengths. By protruding the dome forward 7.5% of the ship’s length, the optimal 17% resistance reduction is achieved and is mainly caused by the pressure resistance decrease. The optimal sonar dome not only functions in the same way as a bulbous bow, but the viscous flow behaviors are also improved. The protrusion corresponding to 90 deg phase lag reduces the bow wave amplitude. The flow acceleration outside the boundary layer and ship wake velocity are higher coinciding with the much lower total resistance. A smaller flow separation and thinner boundary layer are also observed behind the sonar dome because its back slope is less steep. The high pressure covers a smaller area around the bow, and the smaller bow wave crest does not hit the ship’s flare to form high pressure. Consequently, the lower high pressure on the dome front and higher low pressure on the dome back result in the decreases in pressure resistance. The vortical structures are also improved.https://www.mdpi.com/2411-5134/8/2/58computational fluid dynamics (CFD)sonar domeship resistanceviscous flowhull form optimizationbulbous bow |
| spellingShingle | Ping-Chen Wu Jiun-Yu Chen Chen-I Wu Jiun-Ting Lin CFD Investigation for Sonar Dome with Bulbous Bow Effect Inventions computational fluid dynamics (CFD) sonar dome ship resistance viscous flow hull form optimization bulbous bow |
| title | CFD Investigation for Sonar Dome with Bulbous Bow Effect |
| title_full | CFD Investigation for Sonar Dome with Bulbous Bow Effect |
| title_fullStr | CFD Investigation for Sonar Dome with Bulbous Bow Effect |
| title_full_unstemmed | CFD Investigation for Sonar Dome with Bulbous Bow Effect |
| title_short | CFD Investigation for Sonar Dome with Bulbous Bow Effect |
| title_sort | cfd investigation for sonar dome with bulbous bow effect |
| topic | computational fluid dynamics (CFD) sonar dome ship resistance viscous flow hull form optimization bulbous bow |
| url | https://www.mdpi.com/2411-5134/8/2/58 |
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