基于Lagrangian粒子法的船舶横摇阻尼涡模式数值研究

发布时间：2018-03-12 23:05

  本文选题：Lagrangian粒子法　切入点：有限点法　出处：《天津大学学报(自然科学与工程技术版)》2016年10期 　论文类型：期刊论文

【摘要】：Lagrangian粒子法是近年来新兴的一类无网格方法.基于该广义理论下的有限点法,将问题求解域离散为有限个空间粒子点,借助移动最小二乘法获得粒子的物理场函数,利用投影法分步求解拉格朗日形式下的不可压缩Navier-Stokes方程,最后数值模拟得到S60船模各二维横剖面在横摇时的涡模式,有效地捕捉到船体周围流场的非线性特征,如流体分离、漩涡泄出等.计算结果表明:船舯附近的剖面在横摇时,在其舭部周围将会产生两个涡,故舭部表面压力呈正负交错变化;当剖面位置逐渐靠近船艏或船艉时,其舭部涡缩减为一个,此时舭部附近压力符号无变化.将该数值计算结果与试验进行对比验证,二者吻合较好,说明Lagrangian观点下的有限点法针对船体各横剖面的横摇阻尼涡模式均给出了较为准确的数值模拟结果,有效验证了本文计算方法的可靠性.
[Abstract]:Lagrangian particle method is a new kind of meshless method in recent years. Based on the finite point method under the generalized theory, the solution domain of the problem is discrete into finite space particle points, and the physical field function of the particle is obtained by moving least square method. The incompressible Navier-Stokes equation in Lagrangian form is solved step by step by the projection method. Finally, the vortex modes of each 2-D transverse section of S60 ship model are obtained by numerical simulation, which effectively capture the nonlinear characteristics of the flow field around the hull, such as fluid separation. The calculated results show that when the profile near amidships is rolling, two vortices will be produced around the bilge, so the surface pressure of bilge shows a positive or negative staggered change, and when the profile is close to the bow or stern of the ship, The bilge vortex is reduced to one, and there is no change in the pressure symbol near the bilge. The numerical results are compared with the experimental results and the results are in good agreement with each other. It is shown that the finite point method based on Lagrangian's viewpoint gives more accurate numerical simulation results for the rolling damping vortex models of the ship's cross sections, which effectively verifies the reliability of the proposed method.
【作者单位】： 哈尔滨工程大学船舶工程学院;中集船舶海洋工程设计研究院;
【基金】：国家自然科学基金资助项目(51379040)
【分类号】：U661.321
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本文编号：1603700