Numerical study of the influence of hydrofoil hydrodynamic performance considering near-free surface
Bionic flapping hydrofoil motion is increasingly used in bionic underwater robots. However, many scholars have focused their attention on the navigation problem in deep-water environments, thus ignoring changes in the hydrodynamics of hydrofoils under the action of the near-free-surface effect. This...
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| Format: | Article |
| Language: | English |
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Faculty of Mechanical Engineering and Naval Architecture
2025-01-01
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| Series: | Brodogradnja |
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| Online Access: | https://hrcak.srce.hr/file/471943 |
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| _version_ | 1841553159233732608 |
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| author | Yuanhui Wei Jianing Zhang Kaihao Liu Jiazhen Pan Lei Zhang Weimin Chen Qingshan Zhang |
| author_facet | Yuanhui Wei Jianing Zhang Kaihao Liu Jiazhen Pan Lei Zhang Weimin Chen Qingshan Zhang |
| author_sort | Yuanhui Wei |
| collection | DOAJ |
| description | Bionic flapping hydrofoil motion is increasingly used in bionic underwater robots. However, many scholars have focused their attention on the navigation problem in deep-water environments, thus ignoring changes in the hydrodynamics of hydrofoils under the action of the near-free-surface effect. This paper studies and explores the hydrofoil motion in near-free surfaces through the RANS viscous flow numerical simulation method, combined with overset mesh and adaptive mesh technology. Three different forms of motion are studied respectively, including a stationary fixed, a single-degree-of-freedom pitch and a two-degree-of-freedom heaving-pitching coupled hydrofoil. The effects of varying the immersion depth d on the lift and thrust generated were analyzed. Results indicate noticeable differences in the free surface action among different motion forms. When the water depth is less than one chord length C, the lift and thrust of the three motion forms decreased rapidly decrease. When d/C=1~1.5, the static fixed hydrofoil lift and thrust gradually approach the deep-water state. When d/C>2, the pitching motion of a single degree of freedom also tends to be stable. The two-degree-of-freedom motion is d/C>3. This finding shows that the effect of the near-free surface is closely related to the vertical motion. The greater the vertical motion is, the more severe the effect. |
| format | Article |
| id | doaj-art-87e515ac84a94965a4ff53d44f89a61d |
| institution | Kabale University |
| issn | 0007-215X 1845-5859 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Faculty of Mechanical Engineering and Naval Architecture |
| record_format | Article |
| series | Brodogradnja |
| spelling | doaj-art-87e515ac84a94965a4ff53d44f89a61d2025-01-09T11:41:16ZengFaculty of Mechanical Engineering and Naval ArchitectureBrodogradnja0007-215X1845-58592025-01-0176111810.21278/brod76108Numerical study of the influence of hydrofoil hydrodynamic performance considering near-free surfaceYuanhui Wei0Jianing Zhang1Kaihao Liu2Jiazhen Pan3Lei Zhang4Weimin Chen5Qingshan Zhang6School of Naval Architecture and Ocean Engineering, Dalian Maritime University, Dalian, 116026, ChinaSchool of Naval Architecture and Ocean Engineering, Dalian Maritime University, Dalian, 116026, ChinaSchool of Naval Architecture and Ocean Engineering, Dalian Maritime University, Dalian, 116026, ChinaSchool of Naval Architecture and Ocean Engineering, Dalian Maritime University, Dalian, 116026, ChinaSchool of Naval Architecture and Ocean Engineering, Dalian Maritime University, Dalian, 116026, ChinaState Key Laboratory of Maritime Technology and Safety, Shanghai Ship and Shipping Research Institute Co., Ltd, Shanghai, 200135, ChinaState Key Laboratory of Maritime Technology and Safety, Shanghai Ship and Shipping Research Institute Co., Ltd, Shanghai, 200135, ChinaBionic flapping hydrofoil motion is increasingly used in bionic underwater robots. However, many scholars have focused their attention on the navigation problem in deep-water environments, thus ignoring changes in the hydrodynamics of hydrofoils under the action of the near-free-surface effect. This paper studies and explores the hydrofoil motion in near-free surfaces through the RANS viscous flow numerical simulation method, combined with overset mesh and adaptive mesh technology. Three different forms of motion are studied respectively, including a stationary fixed, a single-degree-of-freedom pitch and a two-degree-of-freedom heaving-pitching coupled hydrofoil. The effects of varying the immersion depth d on the lift and thrust generated were analyzed. Results indicate noticeable differences in the free surface action among different motion forms. When the water depth is less than one chord length C, the lift and thrust of the three motion forms decreased rapidly decrease. When d/C=1~1.5, the static fixed hydrofoil lift and thrust gradually approach the deep-water state. When d/C>2, the pitching motion of a single degree of freedom also tends to be stable. The two-degree-of-freedom motion is d/C>3. This finding shows that the effect of the near-free surface is closely related to the vertical motion. The greater the vertical motion is, the more severe the effect.https://hrcak.srce.hr/file/471943bionic hydrofoilflapping wingoverset meshadaptive meshcfdnear-free surface |
| spellingShingle | Yuanhui Wei Jianing Zhang Kaihao Liu Jiazhen Pan Lei Zhang Weimin Chen Qingshan Zhang Numerical study of the influence of hydrofoil hydrodynamic performance considering near-free surface Brodogradnja bionic hydrofoil flapping wing overset mesh adaptive mesh cfd near-free surface |
| title | Numerical study of the influence of hydrofoil hydrodynamic performance considering near-free surface |
| title_full | Numerical study of the influence of hydrofoil hydrodynamic performance considering near-free surface |
| title_fullStr | Numerical study of the influence of hydrofoil hydrodynamic performance considering near-free surface |
| title_full_unstemmed | Numerical study of the influence of hydrofoil hydrodynamic performance considering near-free surface |
| title_short | Numerical study of the influence of hydrofoil hydrodynamic performance considering near-free surface |
| title_sort | numerical study of the influence of hydrofoil hydrodynamic performance considering near free surface |
| topic | bionic hydrofoil flapping wing overset mesh adaptive mesh cfd near-free surface |
| url | https://hrcak.srce.hr/file/471943 |
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