流體動力係數（Hydrodynamic Coefficient）是評估水下載具流體性能的重要指標，而平面運動機構（Planar Motion Mechanism, PMM）試驗是其中主要的測試方法之一。本研究旨在模擬以後插式平面運動機構（Sting-Supported Planar Motion Mechanism, SPMM）試驗，探討全尺度的DARPA SUBOFF模型在斜航試驗（Oblique Test）、純縱移（Pure Surge）、純橫移（Pure Sway）、純橫擺（Pure Yaw）、純起伏（Pure Heave）、純縱搖（Pure Pitch）和橫搖（Pivot Roll）的姿態下，通過調整週期和振幅以及不同平擺速度對流體動力係數的影響。同時，本研究將比對大衛泰勒實驗室（David Taylor Research Center, DTRC）對DARPA SUBOFF模型所測得的流體動力係數，以找出最貼近真實實驗的數值設定。本研究使用DARPA SUBOFF全附屬物模型，結合LES模式和動態網格技術，進行斜航試驗和平面運動機構試驗的計算流體力學（Computational Fluid Dynamics, CFD）模擬。為了模擬真實的流場情況，本研究以拘束模型試驗（Captive Model Test）的形式進行模擬，呈現模型在流場中的拖航姿態。以國立成功大學的拖航水槽之實際尺寸為參考，建立了本研究的計算流域。在網格方面，本研究使用離散化誤差（Discretization Error）分析確定網格尺寸和時間步長的收斂性，而後經過數值運算，以獲得相應的流體動力係數。

The hydrodynamic coefficient is an important indicator for evaluating the fluid performance of underwater vehicles, and the Planar Motion Mechanism (PMM) test is one of the main testing methods. This study aims to simulate the Sting-Supported Planar Motion Mechanism (SPMM) test and investigate the effects of different motions, including oblique tests, pure surge, pure swaying, pure yawing, pure heaving, pure pitching, and pivot rolling, on the hydrodynamic coefficients of the full-scale DARPA SUBOFF model. By adjusting the period, amplitude, and different yawing velocities, the study examines the influence on the hydrodynamic coefficients. Additionally, this study compares the hydrodynamic coefficients obtained by the David Taylor Research Center (DTRC) for the DARPA SUBOFF model to determine the numerical settings that best match real experiments. In this study, the full appendages DARPA SUBOFF model is utilized, and the Computational Fluid Dynamics (CFD) simulations are conducted using a combination of the LES model and Dynamic Mesh Method for the PMM test. To simulate the real flow field conditions, the simulations are performed using a captive model test setup, representing the model's towing in the flow field, and establish the computational domain based on the actual dimensions of the towing tank at National Cheng Kung University. In terms of the grid aspect, the study employs a discretization error analysis to ensure the convergence of grid size and time step. Subsequently, the numerical simulations are performed to obtain the corresponding hydrodynamic coefficients.

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