本篇論文主要探討多體船於波浪中航行之性能優劣，針對其穩度、阻力、船體運動及海上暈船程度進行定性比較分析，以便了解不同體數船艦在不同航行狀態下的表現，供設計者或相關人員參考應用。
本文以兩艘同排水量型、船長相似之雙體船及三體船來作比較分析其船舶靜水性能，並利用船用CFD軟體(SHIPFLOW)估算兩船在不同航速下之興波阻力及航行姿態，再根據二維截片理論搭配勢流理論之二維源點格林函數、源點分佈法及邊界值理論來求解船艦在波浪中之航行運動，最後根據ISO-2631-1(1997)來評估兩艘船艦在波浪中之人員暈船程度，以評估船隻抗暈能力，而後綜合穩度、阻力、船體運動以及暈船程度進行比較分析，得出同排水量型之雙體船與三體船之優劣，藉以作為評斷多體船艦實用性之依據。

This paper aims to study the hydrodynamic performance of the multihull ships with different hull numbers in wave based on the numerical computations including stability, resistance, ship motion and seasickness. A series of analysis is made to compare the advantages and disadvantages with respect to trimaran and catamaran ships.
This article is divided into three part. First, design a trimaran and a catamaran with the same displacement and get the stability of two ships by Rhino and Orca3D. Second, using Computational Fluid Dynamics (CFD) software called SHIPFLOW to obtain the wave-making resistance coefficients in different speeds. Finally, analyzing ships motion based on Strip theory and Potential theory and assess seasickness based on ISO 2631-1(1997) in different sailing situations.
According to the present designs for the trimaran ship and the catamaran ship in this study, the results show that the trimaran ship has more advantages than the catamaran ship in high speed and severe sea conditions based on the hydrodynamic performance analysis.

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