基于IB-LBFS和绝对节点坐标法的降落伞柔性结构流固耦合数值模拟  

Fluid-Structure Interaction Simulation of Parachute Based on IB-LBFS and Absolute Nodal Coordinate Formulation

作　　者：刘钒[1] 舒昌[2] 刘刚[1] LIU Fan;SHU Chang;LIU Gang(China Aerodynamic Research and Development Center, Mianyang 621000, China;Faculty of Engineering, National University of Singapore, Singapore 117576, Singapore)

机构地区：[1]中国空气动力研究与发展中心,四川绵阳621000 [2]新加坡国立大学工程学院,新加坡117576

出　　处：《气体物理》2020年第3期59-68,共10页Physics of Gases

基　　金：国家重点研发计划(2016YFB0200701);国家自然科学基金(11572341)。

摘　　要：在空气动力学、水动力学和生物流体力学领域中,大变形柔性结构的流固耦合现象是一个重要的非线性力学问题.对该系统的数值模拟是分析这一问题的有效手段.将近年提出的一种Descartes流场求解器,即浸润边界-格子Boltzmann通量求解器(immersed boundary-lattice Boltzmann flux solver,IB-LBFS)作为流场求解方法,并引入绝对节点坐标法(absolute nodal coordinate formulation,ANCF)作为大变形结构分析手段,构建了流固耦合求解器以模拟三维流场中的大变形柔性体运动.使用三维来流中的旗帜摆动算例对该流固耦合求解器进行了验证计算.基于该流固耦合求解器对三维不可压流场中的矩形降落伞和十字形降落伞的展开过程进行了非定常流固耦合数值模拟.Fluid-structure interaction(FSI)for structures with large deformation is a crucial problem in aerodynamics,hydrodynamics and bio-fluid mechanics.An efficient numerical method is needed in FSI modeling and analyzing flow over elastic structures.A new FSI solver,which adopts the recent developed Cartesian flow solver called immersed boundary-lattice Boltzmann flux solver(IB-LBFS)and the structure solver of finite element absolute nodal coordinate formulation(ANCF),was developed and validated.Acceleration techniques of the IB-LBFS were applied and a parallel computation framework was implemented.The dynamic behaviors of a square parachute and a cross parachute during inflation were performed with the current IB-LBFS/ANCF FSI solver.Aerodynamic characteristics and the elastic configuration were obtained for different material Young′s modulus.

关 键 词：流固耦合 浸润边界法 格子Boltzmann通量求解 绝对节点坐标法 降落伞 

分 类 号：O355[理学—流体力学]