船舶几种浮态下阻力的数值计算方法

Numerical Calculation Method for Resistance of Ship with Different Floating States

商船会因装载不同而吃水大幅增减,舰艇会因战损而出现严重纵横倾,如何在浮态急剧变化时估算船舶的快速性,是一项具有普遍意义的课题。为了解决上述问题,采用计算流体力学方法对某型船模进行了大量计及自由表面的不同浮态下的阻力数值计算,在深入分析船体浮态改变时影响船舶阻力诸因素的基础上,对数值计算结果进行了研究,推导出船舶吃水、纵倾和横倾变化时的阻力估算公式。据此进行的数值计算结果与水池试验结果对比,吻合良好,从而验证了提出的计算模式的可行性,为解决船舶任意浮态下的阻力计算问题提供了新的思路。

Draft of commercial ships changes with different loadings, severe longitudinal trim or heel may occur in damaged warships at battles. It＇s significant to estimate ship＇s powering performance when its floating state changes sharply. A computational method based on CFD（Computational Fluid Dynamics） is proposed to calculate ship resistance. A series of numerical simulation of a ship with various floating states is carried out. Based on the analysis of the factors which affect ship resistance and the results of numerical simulations, formulas are deduced, which can calculate the resistance of ships with different draft, longitudinal trim and heel. Simulation results based on the formulas agrees well with experimental measurements, which validates the feasibility of the method and provides a new way to calculate ship resistance in an arbitrary floating state.