支持笛卡尔混合网格的不可压流动CFD求解器开发与验证  

Development and Validation of an Incompressible Flow CFD Solver with Hybrid Cartesian Mesh

作　　者：吴乘胜[1] 王星[1] 王建春[1] 金奕星 WU Chengsheng;WANG Xing;WANG Jianchun;JIN Yixing(China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心,无锡214082

出　　处：《中国造船》2021年第3期127-138,共12页Shipbuilding of China

摘　　要：使用切割单元法并结合贴体棱柱层网格来处理物面边界层的笛卡尔混合网格,体现了近年来网格技术发展的趋势。但是在笛卡尔网格和棱柱层网格的结合部,会存在少量网格单元尺度变化剧烈和网格倾斜率高等问题,从而导致数值不稳定和非物理振荡等。为了解决这一问题,在自主开发的CFD求解器中引入梯度限制器,并对相邻单元间界面的插值进行了特殊处理。针对典型的全附体水下航行体和大方形系数水面船模型,分别采用结构化网格和笛卡尔混合网格开展了CFD计算,对包括阻力和尾流场在内的计算结果进行了比较,表明引入了梯度限制器后的CFD求解器能获得与模型试验结果较为接近的数值计算结果,笛卡尔混合网格在复杂尾流场的CFD模拟方面表现出一定的优势。The hybrid Cartesian mesh which is produced by the trimmed cell method together with body-fitted prism layer grid is widely adopted to CFD computation in the near wall boundary layer.There is sometimes drastic change in size and high skewness of cells in the joint region of the Cartesian grids and prism layer grids,so as to cause numerical instability and un-physical oscillation.The gradient limiter is introduced in the self-developed CFD solver and special measure is adopted for the interpolation on the interface between neighboring cells to solve this problem.CFD computations are carried out for a typical full-appended submarine model and a full ship model with structural mesh and hybrid Cartesian mesh respectively and computational results including resistance and stern flow field are compared and analyzed.It is shown that the mentioned problem is solved fairly well,and computational results agree quite well with experimental results.Hybrid Cartesian mesh shows some advantages when computing complicated flow field.

关 键 词：笛卡尔混合网格 梯度限制器 阻力 流场 CFD计算 

分 类 号：U661.1[交通运输工程—船舶及航道工程]