船舶在波浪中运动的强非线性时域模拟

为准确预报在非线性波浪中航行船舶的大幅运动，基于CIP方法建立了波浪中船舶强非线性运动响应的时域分析模型.该模型基于粘性流理论，对N-S方程进行求解，可以考虑船舶的运动响应和自由面变形过程中的粘性效应和强非线性效应.首先，通过模拟船舶的强制垂荡运动，对该数值模型的收敛性展开了研究；然后，基于该模型计算了不同入射波幅和不同入射波长对S175船模的垂荡和纵摇运动响应的影响；最后，模拟了S175船模在大幅波浪中的强非线性运动响应现象.模拟结果表明：基于自编程建立的船舶强非线性运动响应模型具有较好的收敛性和精确性，与其他数值计算结果吻合较好；尤其擅长模拟水花飞溅、甲板上浪、底部砰击等强非线性问题.
To simulate the ship advancing in large waves with large-amplitude motion, a CIP-based strongly-nonlinear seakeeping analysis tool is developed. The effects of viscosity and strongly-nonlinearity are considered in the numerical model, which is based on the viscous flow theory. First, convergence studies are carried out by calculating the radiation problems of S175 hull with forward speed. Then, the ship response of S175 hull including the heave and pitch motions in waves with amplitude and length of waves varied is calculated. Finally, strongly-nonlinear ship responses in large head waves are calculated and captured successfully. It is confirmed that the developed seakeeping analysis tool has numerical stability and accuracy, and has the capability of simulating the strongly-nonlinear seakeeping problem, such as, the phenomena of wave breaking, slamming, and green water on deck.