船舶有航速辐射问题的新实用数值方法

New Practical Numerical Method for Ship Radiation Problem with Forward Speed

为解决船舶在波浪中以恒定速度运动的辐射问题,基于势流理论,采用三维瞬时自由面格林函数方法对船舶水动力问题进行求解。提出三维瞬时自由面格林函数波动项的新数值计算方法,并在大时间区域内基于精细积分法对三维瞬时自由面格林函数的波动项进行插值调用,最终提高波动时域格林函数的数值计算精度。对Wigley船型的水动力系数进行数值计算,并将附加质量和阻尼系数的数值计算结果与试验结果和参考文献进行对比,验证新数值计算方法的有效性。

To solve the radiation problem of ship advancing with a constant forward speed, the transient free surface Green function method is adopted to solve the hydrodynamic problem based on potential theory. A new numerical calculation method for wave part of the transient free surface Green function is presented and the precise integration method is applied to interpolate the wave part of the transient free surface Green function at large time interval, which improves the accuracy of numerical calculation. The numerical calculation is carried out for the Wigley-hull-form ship＇s hydrodynamic coefficients, the obtained numerical results of added mass and damping coefficients are compared adequately with experimental data, thus the numerical method is proved to be reliable.