二维离散方法破冰船层冰破冰阻力数值预报

Numerical prediction of level ice resistance of icebreaker by two-dimensional discrete method

在一定理想化假设的基础上,采用二维数值方法研究了层冰条件下连续破冰过程,应用层冰中压力与接触面积的关系,对时域内层冰破冰阻力问题进行求解。考虑二维数值方法忽略碎冰在船首处的运动,计算船首碎冰运动产生的浸没阻力,对理想状态下的数值模拟结果进行修正,计算破冰阻力。运用Spencer算法、Lindqvist算法和Riska算法对冰阻力进行预报并与数值结果进行对比,并对不同船速及冰厚下的破冰力进行数值模拟。结果表明,考虑浸没阻力后的数值方法模拟结果更加准确可靠,且随船速及冰厚的增加,破冰力呈上升趋势,其中冰厚对破冰力的影响更加显著。

Based on some idealized assumptions,the continuous ice-breaking process under the condition of level ice is studied by two-dimensional numerical method.In order to compute the ice resistance in the time domain,a pressure-area relationship for the ice was applied.Considering the two-dimensional numerical method,the movement of crushed ice at the bow is ignored,and the submerged resistance generated by the movement of crushed ice at the bow is calculated.The numerical simulation under ideal conditions is modified to calculate the ice-breaking resistance.Spencer,Lindqvist and Riska formulas were used to predict the ice resistance and compared with the numerical results.The results show that,the numerical simulation results considering submerged resistance are more accurate and reliable,and the ice-breaking force increases with the increase of ship speed and ice thickness,among which the ice-breaking force is more significantly affected by ice thickness.