直角坐标系下非均匀fdtd网格生成系统的研究与实现-计算机应用技术专业论文.docx

Research and Realization of Non．．uniform FDTD MeshGeneration System in Cartesian CoordinateAbstractWith the development of electromagnetic field and high．performance computers，computational electromagnetic has been improved greatly in recent years．Among all the methods，the Finite-Difference Time．Domain(FDTD)method attracts more and more attentions and applications because of its unique features．It IS a hot research topic in the electromagnetic domain that how to carry out electromagnetic simulation through computer technology and display electromagnetic variation and distribution of different medium vividly S0 as to divide calculation areas reasonably and generate mesh automatically,which canprovide data resource and visual service for FDTD analysis in later stage．Based on computer graphics theory and OpenGL technology，electromagnetic FDTD mesh generation system and graph visualization have been deeply researched in this thesis．The main contributions are as follows：(1)In view of symmetrical curve function theory,an algorithm is introduced in details，which can generate the non—uniform mesh effectively．By using an application sample，we have proved these grids which are produced by the algorithm are not only accurate but also reasonable，and the precision of mesh computation is also enhanced．(2)Based on computer graphics theory and OpenGL technology，we not only analyze the 1 D，2D，3D and section grids of non．uniform FDTD mesh generation system in Cartesian coordinate，but also give the algorithm steps of mesh generation and improve hidden-image mechanism of OpenGL used to realize refined hidden—image of grids graph．The visual effect of mesh graphics for FDTD emulation and simulation is enhanced greatly．(3)Based on the Microsoft Visual Basic6．0 platform．a Non．uniform FDTDMesh Generation System in Cartesian coordinate is developed in this thesis．All functions designed by the system have been achieved including 1 D．2D．3D FDTDgrids，section grids and object geometry pattern