本文目的主要是利用計算流體力學方法來探討不同俯仰情況下船體流體動力之變化以提供船舶在不同航行姿態下對船舶操縱性能的影響資訊。
　　本文先是根據不同船舶操縱性實驗方式，包含斜航試驗、迴旋運動試驗、穩態橫移移動與穩態平擺轉動等方法，來模擬油輪KVLCC2求得其流體動力係數與前人研究文獻實驗結果比較驗證。同時，對貨櫃輪及油輪兩艘船模進行相同的操縱性實驗模擬，並與平面運動機構（PMM）實驗結果做比較，來驗證CFD方法於流體動力係數分析之可行性。接著對貨櫃輪及油輪兩艘不同的船型進行不同俯仰角度的操縱性實驗模擬，對其流體動力係數變化進行比較及討論。比較內容包含縱移、橫移與平擺三個方向的各項流體動力係數及附加質量。並將所求得流體動力係數與附加質量代入MMG船體運動模型進行模擬比較不同俯仰狀況的操縱性優劣狀況。
　　在斜航試驗搭配迴旋運動試驗的模擬結果與穩態橫移移動搭配穩態平擺轉動模擬結果比較上顯示是否有x方向入流對流體動力係數有明顯的影響。同時，將模擬結果與船模實驗數據比較後，可發現以CFD方法進行斜航試驗與迴旋運動試驗模擬預估線性項的流體動力係數是可行且有效率的，但非線性項部分還有修正的空間。
　　在不同俯仰狀況對流體動力係數的影響部分，多數流體動力係數皆可觀察出與俯仰角度相關的趨勢。在MMG運動模型的模擬中，貨櫃輪在艏俯時迴旋運動性能最佳，平浮次之，艉俯最差。而油輪在艉俯時迴旋運動性能較平浮優異，但艏俯與平浮比較時有好有壞，無法判斷兩者優劣。在Z型運動試驗上，貨櫃輪與油輪結果相同，皆是艉俯時性能最佳，平浮次之，而艏俯最差。

　　The goal of the present article is to analyze the influence of different trim on hydrodynamic coefficients by CFD method and provide complete information of ship maneuvering in different navigation status.
　　First, we simulate different maneuvering tests for three models, i.e. KVLCC2, container and tanker, and compare the relating hydrodynamic coefficients with the data based on the former existing test and new experiments in NCKU to verify the reliability of CFD method applied here. The influence on hydrodynamic coefficients of the container and the tanker with respect to different trim cases is also analyzed. Finally, we use MMG model to simulate ship motions and analyze the influence on maneuvering characteristics.
　　From the present study, we find that the longitudinal velocity component has significant influence on hydrodynamic coefficients. Besides, the results show that using CFD method to predict linear coefficients is available, but there is still some room for improving the nonlinear term solutions.
　　Most of hydrodynamic coefficients show correlation with trim angle in simulations with respect to different trims. The motion simulations show that the container has best turning ability with trim by bow, even keel is the second, and trim by stern is the worst. However, the best course checking ability appears with trim by stern, even keel is the second, and trim by bow is the worst. The tanker’s turning ability with trim by stern is the best, however, it’s hard to determine which case is better with trim by bow or even keel. It has best course checking ability with trim by stern, even keel is the second, and trim by bow is the worst , which is similar to the container.

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