浅窄航道中迎浪航行船舶的运动和波浪增阻数值预报研究

Numerical Study on Motion and Added Resistance for Ship Advancing in Head Waves in Shallow and Narrow Waterways

浅窄航道中船舶水动力特性同时受到浅水效应和池壁效应的影响。论文以DTC标模为研究对象,基于STAR-CCM+黏流计算软件,采用RANS方法对有限水深中迎浪航行船舶的运动响应和波浪增阻特性开展数值模拟研究。在针对标模基准工况进行数值方法验证的基础上,分别开展与拖曳水池等宽度的浅窄航道和开阔浅水域中系列波长下的船模垂向运动响应和波浪增阻数值计算。结果表明,有限水深中低频段的运动和阻力非线性特性明显,波浪增阻主要来自压阻力增加;池壁对低频段运动一阶幅值的影响较大,使得波浪增阻系数关于遭遇频率的非线性关系明显增强,出现局部最大和最小值特性,但对运动和阻力高阶幅值的影响较小。

Ship hydrodynamics are under the effects of water depth and side wall in shallow and narrow waterways.In this paper,a DTC ship model is taken as the study object and STAR-CCM+is used as the CFD solver for viscous flow to carry out the numerical study on the ship motion and added resistance in head waves in finite water depth by RANS method.Based on the validation of the numerical method for benchmark cases,ship vertical motion responses and added resistance in head waves for a series of wavelengths in a shallow and narrow waterway of the same width as the towing tank and in an open shallow waterway are numerically calculated.Results indicate that the ship motion and resistance in the lower wave frequency range are nonlinear,and the increase in pressure resistance contributes most to the added resistance in waves.In the lower wave frequency range,side wall effects the linear motion response significantly,and results in the nonlinearity and local extreme values of added resistance in waves,but it has an insignificant effect on the higher-order components of ship motion and resistance.