基于动态混合网格的多体分离数值模拟方法  

A CFD-and-6DOF-coupled solver for multiple moving object problems based on dynamic hybrid grids

作　　者：段旭鹏[1] 常兴华[1,2] 张来平[1,2] 

机构地区：[1]空气动力学国家重点实验室,四川绵阳621000 [2]中国空气动力研究与发展中心计算空气动力学研究所,四川绵阳621000

出　　处：《空气动力学学报》2011年第4期447-452,共6页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(10872023);国家重点基础研究发展计划(2009CB723802)

摘　　要：在以往发展的动态混合网格技术的基础上,耦合六自由度运动方程计算和非定常流场计算,建立了一种多体分离问题的非定常数值模拟方法。首先采用刚体运动的六自由度运动方程,建立刚体运动轨迹计算模块,然后以该模块为纽带将以往建立的非定常计算方法与改进的基于Delaunay背景网格插值方法和局部网格重构方法相结合的动态混合网格生成方法耦合起来,形成了精度较高、效率较快的多体分离数值模拟方法。利用该方法对典型多体分离问题进行了数值模拟,计算结果与风洞实验结果吻合较好。A CFD-and-6DOF-coupled solver for multiple moving object problems is presented based on our dynamic hybrid grid technique.A sub-solver for 6-DOF equations is established firstly,and then fully integrated into the unsteady CFD solver to determine moving body dynamics.Meanwhile,the dynamic grid generator is improved to achieve better moving grid quality and more efficiency.The basic procedure of this method is as following： Firstly,the aerodynamic forces are computed by our unsteady solver at a certain time step.Secondly,the trajectory is calculated by the 6-DOF model using those aerodynamic parameters as input.Thirdly,the new grid of next time step is generated by our dynamic grid generation method.Repeating those three steps until separation finishes.This CFD-and-6DOF-coupled solver is validated by a typical store separation problem.The computational results are compared with experimental data and other numerical results in references,which demonstrate the accuracy and property for complex multiple moving object problems.

关 键 词：动态混合网格 非定常流动 六自由度 多体分离 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]