Hydrodynamic Analysis ofUnderwater Gliders

• Main Authors: Min-Yu Cai, 蔡旻育
• Other Authors: Forng- Chen Chiu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/32261359821904929970

碩士 === 臺灣大學 === 工程科學及海洋工程學研究所 === 95 === Autonomous Underwater Glider (AUG) is a novel kind of autonomous underwater vehicle that has very long range and very long duration. An underwater glider is driven by buoyancy engine which could change net buoyancy by expelling or infusing water, and moving weight. Since the dynamic characteristics of an underwater glider depend on its hydrodynamic coefficients significantly, it’s important to analyze or estimate the hydrodynamic coefficients with accuracy enough. In the present study, the CFD commercial software FLUENT was used to analyze the flow field and determine the hydrodynamic coefficients of an underwater glider. In order to confirm the numerical approaches and mesh arrangement in determining the hydrodynamic coefficients of an underwater glider are appropriate, a comparison calculation was carried out firstly using the experimental data of 4621 axial symmetric submerged body tested by DTNSRDC and NTU. Then the same numerical approaches and mesh arrangement are applied to an underwater glider to determine its hydrodynamic coefficients. Estimation using DATCOM database is also examined by comparing with the CFD results using FLUENT.