基于模态叠加的多块结构动网格生成通用技术  

A General Multi-block Dynamic Grid Technology Based on Modal Superposition

作　　者：卢伟涛 郭同庆[1] 沈恩楠 周迪[1] 吴江鹏[2] 胡家亮[2] LU Wei-tao;GUO Tong-qing;SHEN En-nan;ZHOU Di;WU Jiang-peng;HU Jia-liang(Nanjing University of Aeronautics and Astronautics,Nanjing 210000,China;Shenyang Aircraft Desigin and Research Institute,AVIC,Shenyang 110000,China)

机构地区：[1]南京航空航天大学,江苏南京210000 [2]航空工业沈阳飞机设计研究所,辽宁沈阳110000

出　　处：《航空计算技术》2024年第6期70-75,共6页Aeronautical Computing Technique

基　　金：国家自然科学基金项目资助(12102187);江苏省高校优势学科建设工程项目资助(U2341230)。

摘　　要：从CFD/CSD耦合技术的工程应用背景出发,基于径向基函数(RBF)与无限插值(TFI)混合动网格方法和模态叠加原理,发展出一种通用性强的多块结构动网格技术。将结构模态分别插值到各部件物面网格点并对部件交界处进行模态光顺,基于单一的气动网格开展流固耦合计算;使用RBF-TFI方法将模态从物面网格点插值到全流场网格点,通过空间模态叠加得到物面变形与动网格;对于舵面持续偏转等情形,将舵面偏转视为一阶模态,利用空间模态插值后输出的RBF插值矩阵快速生成动网格。算例分析了机翼操纵面偏转非定常气动力、机翼颤振、全机颤振。结果表明:该技术通用于不同构型,能够高效地生成动网格;计算结果与实验数据吻合良好,网格变形十分有效。For engineering applications of the coupled CFD/CSD method,a general multi-block dynamic grid technology is developed based on modal superposition.Firstly,the structural modes are interpolated to surface grid of each component so that the coupled CFD/CSD calculations are performed on CFD grid.Secondly,the surface modes are interpolated to spatial grid by using the radial basis functions(RBF)and transfinite interpolation(TFI)hybrid dynamic grid method,the surface deformation and dynamic grid are obtained by superimposing the spatial modes.For elastic aircraft with rudder,rudder deflection is considered as a structural mode,the dynamic grid for continuous rudder deflection is generated using the RBF matrix which is outputted after spatial modal interpolation.The dynamic grid technology is used to analyze the aerodynamic forces of control surface,flutter of wing,flutter of full configuration with store.The results show that the dynamic grid technology is applicable to different configurations and achieves efficient dynamic grids generation.The calculated results are in good agreement with experimental data,dynamic grid generation is effective.

关 键 词：动网格 气动弹性 模态叠加法 CFD/CSD耦合 舵面偏转 

分 类 号：V211.47[航空宇航科学与技术—航空宇航推进理论与工程]