方形波浪中船舶参数横摇数值模拟方法研究

Numerical Prediction of Parametric Rolling of Ships in Cross Waves

以一艘集装箱船为研究对象,在国内首次开展方形波浪下船舶参数横摇模型试验,并对方形波浪下船舶参数横摇数值模拟方法进行了研究。首先对基于粘流和势流的数学模型分别进行了介绍,并介绍了方形波浪中的模型试验方法。比较和分析了数值预报方法和模型试验的横摇数据。研究结果表明:当船舶的横摇固有周期接近波浪遭遇周期的两倍时,该集装箱船在方形波浪中可能发生参数横摇。论文建立的粘流和势流计算方法,可有效预报方形波浪下的参数横摇,为船舶的稳性安全性能评估提供参考。

Parametric rolling model test of a container ship in cross waves is carried out for the first time,and numerical approaches for parametric rolling in cross waves are studied.Mathematical models based on viscous and potential theory are introduced respectively.Experimental method in cross waves is illustrated,and test results of parametric rolling are analyzed.Numerical results are compared with the experimental data.It is shown that,if frequency of ship’s rolling is equal or near to half of the encounter frequency,then parametric rolling may happen in cross waves.With the established simulation method,parametric rolling in cross waves can be predicted well,which may provide useful preference for evaluating stability of ships in cross waves.