部分浸没平板绕流的两相湍流高保真度数值模拟研究 | |
Alternative Title | High-fidelity numerical simulation of mixed-phase turbulence induced by partially submerged plate |
童俊淇![]() | |
Thesis Advisor | 杨子轩 |
2024-11-26 | |
Degree Grantor | 中国科学院大学 |
Place of Conferral | 北京 |
Subtype | 硕士 |
Degree Discipline | 流体力学 |
Keyword | 大涡模拟 船首波 混相湍流 湍流质量通量 |
Abstract | 随着人类愈发频繁地进行海洋活动,船舶海洋工程对于减少船只行进阻力、 |
Other Abstract | As human maritime activities are conducted more frequently in recent years, the engineering demands such as reducing vessel drag, minimizing ship environmental noise, and enhancing onboard sonar detection accuracy have become more prominent. Surface breaking waves, represented by bow waves, significantly impact these issues. Therefore, understanding the physical laws of breaking bow waves has crucial research significance for the development of ship marine engineering. This thesis studies the breaking bow waves induced by uniform incoming flow past a rectangular plate. It discusses the yaw angle effect and the Froude number effect by setting two groups of comparison cases and validates the closure model of turbulent mass flux based on the calculated data above. The main conclusions are as follows: (1) The flow induced by the plate transitions from a stable overturning regime to an unstable breaking regime as the yaw angle increases, with the impact region expanding in the spanwise direction and extending upstream. Meanwhile, wave breaking becomes more intense, and the trend of transporting droplets upstream intensifies under the unstable breaking regime. (2) At large yaw angles, the physical laws of bow wave breaking induced by the plate are consistent as the Froude number increases. The Froude number has a minor impact on the location of the concentrated breaking region compared to the yaw angles. Differences among the Froude number cases are primarily reflected in the magnitude of physical quantities. The magnitude of physical quantities such as turbulent kinetic energy increases, and the trend of transporting droplets and bubbles upstream intensifies as the Froude number increases. (3) The area-averaged turbulent kinetic energy within the mixed-phase region has a single peak profile in its variation along the streamwise direction, indicating that the generation of turbulent kinetic energy is concentrated in regions of intense breakage. However, the area-averaged turbulent mass flux has a multipeak peak profile. The spatial distribution correlation between turbulent kinetic energy and turbulent mass flux is relatively weak, but the correlation between turbulent kinetic energy and the production term of turbulent mass flux is strong. |
Language | 中文 |
Document Type | 学位论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/97810 |
Collection | 非线性力学国家重点实验室 |
Recommended Citation GB/T 7714 | 童俊淇. 部分浸没平板绕流的两相湍流高保真度数值模拟研究[D]. 北京. 中国科学院大学,2024. |
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File Name/Size | DocType | Version | Access | License | ||
tongjunqi_thesis.pdf(30210KB) | 学位论文 | 开放获取 | CC BY-NC-SA | Application Full Text |
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