碎冰模型形状对船舶碎冰阻力数值预报的影响

The influence of the shape of brash ice models on the prediction of ship resistance in the brash channel

在数值模拟中,碎冰模型形状对于船舶碎冰阻力预报结果的准确性具有显著影响。本文以某极地环保多用途运输船为案例对象,研究7种数值碎冰模型形状对船舶碎冰阻力预报的影响,建立片状正方形、圆形、正五边形、正六边形、椭圆形、梯形和不规则多边形数碎冰模型,采用CFD-DEM的方法对船舶碎冰阻力进行预报,并将结果与冰水池模型试验相对比。研究表明,7种形状碎冰模型均能很好模拟出模型试验现象,数值计算得到的碎冰阻力值均比模型试验结果高,片状圆形碎冰模型数值计算值高2.04%,在7种形状中误差最小。因此,在以阻力预报为目的船舶碎冰航道航行CFD-DEM数值计算中,建议采用片体形状为圆形的数值碎冰模型。

The accuracy of ship resistance prediction in the brash ice channel is significantly influenced by the shape of brash ice models in numerical simulation.This study focuses on a polar environmentally friendly multipurpose transport ves-sel and investigates the impact of seven different shapes of brash ice models on the prediction of ship resistance in the brash ice channel.Seven different shapes of flaky brash ice models were established,including circle,oval,square,regular pentagon,regular hexagon,trapezoid,and irregular polygon.The CFD-DEM coupling numerical method was applied to pre-dict the ship resistance in the brash ice channel,and the results were compared with HSVA ice tank tests.The results show that seven different shapes of flaky brash ice models all can effectively simulate HSVA tests'phenomena.By comparison of the numerical calculation results in seven different ice shape condition with HSVA test results,it is shown that the numerical calculation results are all larger than test results and flaky circular brash ice model has the minimum error of 2.04%.There-fore,flaky circular shape is more recommended in CFD-DEM calculation from the perspective of resistance prediction.