箱形船水动力特性的数值计算

Numerical Simulation on Hydrodynamic Characteristic of a Trunk Ship

本文采用RANS方程和RNGk-ε二方程湍流模型对带自由表面的箱形船的水动力特性进行数值计算。数值计算时,使用有限体积法离散控制方程,对流项采用二阶迎风差分格式,扩散项采用中心差分格式,对一艘方形系数为0.95的箱形船进行一系列速度下流场、阻力、兴波、下沉和纵倾的数值计算,并与在中国船舶科学研究中心拖曳水池进行的模型试验进行全面的比较,结果令人满意,是自由面绕流的数值计算在箱形船这样特殊的船型上的成功尝试。

A numerical simulation on hydrodynamic characteristic of a trunk ship with free surface was carried out by solving Reynolds Averaged Navier-Stokes Equations (RANSE) and Renormalization Group (RNG) k-Ε two-equation turbulence model. FVM (Finite Volumetric Method) was used to discrete the governing equations, the second-order upwind difference scheme was adopted for the convection item and the centric difference scheme for the dissipation item. A trunk ship with block coefficient of 0.95 was studied. The flow field, drag, wave, sinkage and trim of the ship were computed at different speeds. The computed results agree well with the experimental results carried out in the tower tank of CSSRC. It shows that the try on the numerical simulation of special type of ships such as the trunk ship is successful.