Key Techniques And Applications Of Parallel Method Of Moments Based On Supercomputer Platforms

Electromagnetic scattering and radiation analysis is of great importance to the unified integration and design of complex systems on platforms, such as airplanes, ships and satellites. However, accurate simulation of the complex electromagnetic systems has long been a challenging problem due to the huge storage and computational amount. Fortunately, the rapid development of the domestic high-performance supercomputers offers a strong support for the electromagnetic simulation of AWACS and other major national strategic projects. So the massively parallel computing technique based on the method of moments (MoM) is utilized to improve the electromagnetic computing capability and accelerate the solving process. And the parallel MoM is used to analyze large array antenna, airborne antenna array layout, electromagnetic pollution form based station antenna and other important engineering fields.This article studies the key theories of the MoM based on RWG basis functions and higher-order basis functions. Given the characteristics of the MoM, the matrix distribution scheme, parallel matrix filling scheme and parallel matrix equation solving scheme are discussed. To solve the issue of inter-process redundant integrals in parallel MoM using RWG basis functions, an efficient parallel matrix filling scheme is proposed through mesh index optimization, and the numerical results show that the proposed scheme is of great efficiency.To improve the performance of parallel MoM, the size of block, the process of grid and the size of the in-core buffer are relevant to tuning the performance, and general guidelines of the three parameters are given. The accelerating performance of the SSDs is analyzed simultaneously. Then the parallel performance of the MoM is evaluated by simulating different models on Multiple Supercomputer. The parallel scale of MoM is 2400 CPU cores on the cluster at Higher Performance Computing Center in Xidian University. With 360 CPU cores as the benchmark, the parallel efficiency is about 65% when using 2400 CPU cores. The parallel scale of MoM is 4096 CPU cores on "Magic Cube" at Shanghai Supercomputer Center. With 512 CPU cores as the benchmark, the parallel efficiency is greater than 50% when using 4096 CPU cores. The parallel scale of MoM is 12000 CPU cores on "Tianhe-2" at National Supercomputing Center in Guangzhou. With 600 CPU cores as the benchmark, the parallel efficiency is greater than 65% when using 12000 CPU cores. The parallel scale of MoM is 102400 CPU cores on "Sunway BlueLight" at National Supercomputing Center in Jinan. With 320 CPU cores as the benchmark, the parallel efficiency is greater than 55% when using 10240 CPU cores. With 1536 CPU cores as the benchmark, the parallel efficiency is greater than 45% when using 102400 CPU cores. The range of memory ratio is given throughout the testing to ensure than good efficiency can be obtained. Moreover, according to the search report, one can see that the parallel scale of this title is the largest in the world.In this title, the in-core solver and the out-of-core solver of the parallel higher-order MoM are used to analyze the complex electromagnetic problems, such as airborne antenna array layout, large array antenna and the electromagnetic pollution form based station antenna. For the in-core solver, two sets of examples are considered. One is the airborne microstrip array. The radiation of phased array installed on different positions of the airplane is considered, and then the radiation of airborne phased array scanning different angles is simulated. The other is the airborne Yagi array. Three cases of beam direction are considered, including the nose, wing and tail of the airplane platform. And then the radiation of the Yagi array installed on different heights of the airplane in the three cases is simulated. For the out-of-core solver, the large slot array, the large microstrip array, the airborne array and the electromagnetic pollution form based station antenna are considered. Noting that, the unknowns of the airborne array is up to 1.5 million, which are the largest double-precision complex dense matrix equations to solved using the MoM. Numerical results in this dissertation can be offered as valuable references for electromagnetic engineering.