重心纵向位置对滑行艇阻力性能的影响研究

LCG Effects on Resistance Performance of a Planing Hull in Calm Water

高速滑行艇姿态和阻力的准确预测对于提高船舶水动力性能具有重要意义。为了研究重心纵向位置对滑行艇阻力和水动力性能的影响,验证CFD方法的适用性,本文采用动态重叠网格方法进行CFD数值模拟,采用有限体积法求解湍流模型为SST k-ω的雷诺平均方程,水气两相流的自由界面采用VOF方法捕获,给出并分析了不同速度下三个不同重心纵向位置的结果比较。不同重心纵向位置情况下的数值结果比较表明:下沉和纵倾角随XCG的减小而增加,同时导致润湿面积减少;当重心纵向位置向后移动时,水动升力使滑行艇更容易进入滑行状态。

The accurate prediction of attitudes and resistance of high-speed planing hulls is signifi⁃cant for the improvement of ship hydrodynamics.To investigate the effects of XCG(longitudinal center of gravity)on the resistance performance of a planing hull and verify the applicability of the CFD meth⁃od,the CFD simulation with the dynamic overset mesh method was carried out.The finite volume method(FVM)was adopted to solve the Reynolds-Averaged Navier-Stokes(RANS)equation incorpo⁃rated with the SST k-ωturbulence model in the current numerical simulation.And the interface of a two-phase flow was captured by the volume of fluid(VOF)scheme.The details of the comparative ef⁃fect of three different XCG positions were given and analyzed at various speeds.According to the pres⁃ent studies,the comparison of numerical results with different XCG cases illustrates that the sinkage and trim angle increase with decreasing XCG,causing a decrease in the wetted area simultaneously.When the position of XCG moves backward,the hydrodynamic lift force makes the planing hull easier to enter the planing region.