本研究採用計算流體力學（CFD）的三種網格劃分方法：多重參考系（MRF）、滑移網格及重疊網格。本研究目的是比較螺槳在開放水域和船體後方流動技術。大多數值數據是一般民眾可以取得的，因此選擇SUBOFF 潛艇模型和E1619螺旋槳作為本次研究，並使用開放的CFD代碼資源 OpenFOAM 進行數值模擬，將 SST k-ω 湍流模型的雷諾平均(RANS) 模型與 Spalding 壁函數一起使用，每種網格劃分方法針對各種操縱條件，像是前進、後退、緊急前進停俥及緊急後退停俥，研究SUBOFF模型在開放水域和自航狀態時的流動狀況。在非設計條件之前，使用實驗數據驗證在前進條件下的開放水域性能，SUBOFF模型的水動力性能也在自航試驗前進行了驗證。最終，開放水域和船體後面的所有測試條件表明，滑移網格優於 MRF 及重疊網格方法，因為它可以抓取由船體-螺旋槳交互作用而導致的更複雜的流動結構，特別是在緊急後退和緊急前進條件下。討論每種方法之間的差異，包括螺槳性能、艉流和渦流結構。

The present study employed three meshing methods for computational fluid dynamics (CFD): multiple reference frame (MRF), sliding mesh, and overset mesh. The purpose of this study is to compare those techniques for presenting propeller flow in open water and behind the hull. A fully appended SUBOFF submarine model and the propeller E1619 were selected for this investigation due to the large amount of numerical data available for the public. The numerical simulation was carried out using open-source CFD codes OpenFOAM. The Reynold-Average Navier-Stokes (RANS) with SST k-ω turbulence model is employed together with Spalding wall function. Using each meshing approach, various maneuvering conditions such as forward, crash-back, crash-ahead, and backward are conducted to study the flow of open water condition and self-propelled SUBOFF model. The open water performance in forward condition was validated with experiment data prior to other off-design conditions. In addition, the hydrodynamic performance of the SUBOFF model was also validated prior to self-propulsion test. Finally, all test conditions in open water and behind the hull show that the sliding mesh outperforms the MRF and overset mesh approach because it can capture more complicated flow structures due to hull-propeller interaction, particularly in the crash-back and crash-ahead condition. Discussions on the differences between each method were presented including propeller performance, wake flow, and vortical structure.

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