The Three-Dimensional Numerical Simulation of Submerged Body’s Resistance and the Analysis of Turbulence Flow Field

• Main Authors: Hsiang-HaoTsao, 曹翔皓
• Other Authors: Ming-Chung Fang
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/9y65h6

碩士 === 國立成功大學 === 系統及船舶機電工程學系 === 107 === The purpose of the study is to establish an effective and precise numerical method to predict the resistance of the submerged body in deep water by computational fluid dynamics(CFD) techniques, and the SUBOFF model of the David Taylor Research Center (DTRC) is taken as the verification object of the study.For the numerical model, Finite Volume Method (FVM) is used as a discretization technique for solving partial differential equations. Otherwise, the Semi-Implicit Method for Pressure-Linked Equations-Consistent (SIMPLEC) is employed to solve the flow field, Comparison between turbulence models RNG K-ε, SST K-ω and Transition SST were carried out to establish a suitable method for the analysis of submerged body’s resistance. In the verification process, the mesh independence analysis is first carried out for three turbulence model to define the suitable number of meshes to be applied in the research, it is also discussed that the effectiveness of each turbulence models for estimating the resistance of the submerged body when the meshes around the boundary layer is not refined. Courant Number analysis is adopted as an evaluation indicator to confirm if the selection of the time step size is reasonable. Finally, under the condition of different Y+ values, the prism-mesh layers were distributed on the surface of the submerged body. The effectiveness of three turbulence models were evaluated. An appropriate approach is than established with SST K-ω model to calculate the resistance of submerged body more accurately and more effectively within error less than 5%.