船体三维边界层计算的初值确定

On determination of initial values in calculation of three-dimensional boundary layers around ship hulls

为了研究绕船舶后体粘性绕流计算方法，提供了一个实用、简单和准确预报船舶前体边界层的方法。该计算由简化的Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程、三维传输补充方程、幂指数速度分布函数、表面摩擦律和一个积分数值计算方法组成．计算实例表明，沿船长自首部 ７０％的范围内，数值计算结果同高阶理论所给出的计算结果以及同Ｌａｒｓｓｏｎ给出的测试结果符合良好。

In order to investigate the calculation method for the viscous flow around after-body of ship hulls, a unified, simple and accurate prediction procedure for parameters of the boundary layer on the ship fore-body is necessary.The characterization of the ship form and its flow are considered and the Navier- Stokes equation is made a suitable simplification.To close these equations, a three dimensional entrainment equation is deduced based on Head's work and the wall velocity profile provided by Mager is adopted.A group of algebraic equations are obtained by using the integration normal to the direction of the hull surface. The calculation results show that the parameters of the boundary layer up to 70% of the ship length from the bow accord well with both the calculation results using a higher order theory and the test results from model measurement.