基于浸润边界-格子波尔兹曼通量求解器的柔性结构流固耦合数值模拟  

Fluid-structure interaction simulation for elastic structures based on immersed boundary-lattice Bolzmann flux solver

作　　者：刘钒[1,2] 刘刚 江雄[1] 舒昌[2] LIU Fan;LIU Gang;JIANG Xiong;SHU Chang(China Aerodynamics 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,绵阳621000 [2]新加坡国立大学工程学院,新加坡117576

出　　处：《空气动力学学报》2019年第5期705-714,共10页Acta Aerodynamica Sinica

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

摘　　要：浸润边界-格子玻尔兹曼通量求解器(Immersed Boundary-Lattice Boltzmann Flux Solver,IB-LBFS)在处理复杂动态边界流动中具有计算精度高和灵活性强的特点,可应用于柔性体流固耦合数值模拟中。本文对IB-LBFS进行了算法效率上的优化改进,设计和实现了并行计算能力,使之可求解具有较大规模网格的流动问题,且通过旋转球体的绕流计算进行了验证。在此基础上,通过应用基于绝对节点坐标法的柔性结构动力学方法,与IB-LBFS结合,建立了可处理大变形柔性结构的流固耦合问题的数值模拟平台,通过旗帜摆动问题和固支板受流体载荷的弯曲变形问题验证并实现了大变形柔性结构的流固耦合高效仿真。The fluid-structure interaction phenomenon for elastic structures with large deformation is widely observed in nature and engineering. The numerical simulation of such system involves solving flow around moving deformable boundaries. The Immersed Boundary-Lattice Boltzmann Flux Solver (IB-LBFS) is a recently developed numerical method in finite volume framework, which is also suitable for simulating flows around complex geometry in Cartesian grid. In the LBFS, the lattice Boltzmann equations at local interface are reconstructed by fluxes at cell interface. The LBFS improves the computational flexibility and efficiency substantially when compared with standard lattice Boltzmann method. The no-slip boundary condition is satisfied by using an implicit boundary condition-enforced immersed boundary method. Acceleration techniques of the IB-LBFS are presented, and a parallel code and algorithm for the IB-LBFS are developed. A fluid-structure interaction numerical platform is established joint with the Absolute Nodal Coordinate Formula (ANCF) structure solver to simulate elastic structure FSI problem with large deformation. Flows around a swilling sphere are performed to test the acceleration techniques and parallel code. Test cases for flow across a swinging flag and a clamped plate are presented for validation and are used for the comparison with traditional FSI solver.

关 键 词：浸润边界法 并行计算 流固耦合 柔性结构动力学 

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]