用于高功率微波器件粒子模拟的三维柱坐标系共形网格生成技术  

Three-dimensional cylindrical coordinate conformal grid generating technology for particle-in-cell simulation of high-power microwave device

作　　者：张磊[1] 翁明[1] 王玥[1] 蒋铭 Zhang Lei;Weng Ming;Wang Yue;Jiang Ming(Key Laboratory for Physical Electronics and Devices of the Ministry of Education,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学电子科学与工程学院电子物理与器件教育部重点实验室,西安710049

出　　处：《强激光与粒子束》2024年第4期180-186,共7页High Power Laser and Particle Beams

基　　金：国家青年科学基金项目(12005165);国家自然科学基金项目(12175176)。

摘　　要：基于面向对象的C++语言研制三维柱坐标共形网格生成程序,对束-场互作用器件作共形网格剖分,为粒子模拟算法提供积分线元、面元。通过定义三维柱坐标网格体系如网格步长、网格索引、守护网格层、包围盒等数据,使模型的空间信息能转换成柱坐标网格信息。将轴上网格单元作特殊处理,使粒子模拟算法形式在轴上网格和在非轴上网格上保持一致。利用射线跟踪法得到属于模型子面、模型棱边的离散边界点,接着通过拓扑关系获得模型的顶点,保存上述三类离散边界点的拓扑信息和网格信息。将构建的基础网格元与边界点信息耦合,在离散网格体系中重构模型。用该共形网格剖分技术对相对论磁控管进行剖分,能够识别该磁控管的透明阴极、阳极和谐振腔等结构。Based on the object-oriented C++language,a 3D cylindrical coordinate conformal grid generation program is developed.The conformal grid generation of beam-field interaction(BFI)device discretizing is performed,providing integral line and face elements for Particle-in-Cell simulation algorithm.By defining the basic elements of the three-dimensional cylindrical coordinate grid system,including grid step-size,grid index,guardian grid layer and bounding box,the spatial information of the model can be converted into the information of the cylindrical coordinate grid information necessary for numerical calculation.The grid cells on-axis should be specially treated so as to maintain the consistency of the particle-in-cell algorithm between the axial grid and the non-axial grid.The discrete boundary points on the model subsurface and on the model edge were attained by ray-tracing algorithm.Meanwhile,the vertices of the model were obtained by topological relations.Topological information and cylindrical coordinate grid information of the two types of boundary points and model vertices were recorded,then the basic grid elements were coupled with the boundary point information,finally the model was reconstructed in the discrete grid system.Taking the relativistic magnetron for example,using the conformal grid generation technique proposed in the paper to discretize the model,the transparent cathode,anode,and resonant cavity structures of the magnetron can be identified.

关 键 词：粒子模拟 三维柱坐标 网格剖分 射线跟踪 共形技术 

分 类 号：O411.3[理学—理论物理] TN815[理学—物理]