水面船非线性兴波数值方法研究

Study of numerical method for nonlinear ship wave making

本文在线性兴波数值方法的基础上,利用Rankine源法开展了非线性兴波数值方法的研究。采用迭代的方来满足非线性自由面条件,并在迭代中考虑真实的船体湿表面;此外将自由面面元升高来提高数值稳定性、而配置点前则用来满足辐射条件。通过对Series60船型,以及一条集装船的计算来验证本文所开发的非线性兴波数值计算方法,经较发现非线性方法的计算结果比线性方法明显改善;证实本文方法已经成功建立了非线性兴波问题的迭代框架,实现了线性兴波数值计算方法。

Based on the linear wave-making numerical method, the investigation on nonlinear wave-making numerical method by using a Rankine source method is presented in this paper. To satisfy the nonlinear flee surface conditions, iterative approach is needed and the actually wetted surface is also taken into account during the iteration. To raise the flee surface panels above the calm water surface is to improve the numerical robustness, while the collocation points shift forward to meet the radiation condition. The test results of the Series 60 .and KCS are used for validation. The wave profile cuts of nonlinear calculation are significantly better than that of linear calculation, and it confirms that a numerical approach for nonlinear ship wave making is realized in this research.