High-order Number Simulation Of The Electromagnetic Scattering Problems For 2D Fully-conducting Objects

With the rapid development of modern science and technology, the battlefield environment and means of war will become particularly complex in the future. As an emerging, broad development prospect of the application of science and technology, the rise of stealth technology will have a significant impact on the future wars. It is known as the most important and effective technical measures of penetration tactics in the high technology war with integration of sea, land, sky, space and electromagnetism. Radar scattering cross is used as a physical quantity to measure the ability of electromagnetic scattering, which in the same time is also an important indicator used to measure the stealth performance of target. Although there are kinds of methods to calculate radar scattering cross, the existing frequency domain method and some of the time domain method can't meet the requirements of complex geometries. Previous researches show that the conservative format of the Maxwell's equations is similar with the Euler equations in CFD(Computational Fluid Dynamics) the DG(Discontinuous Galerkin) method is mature in solving the flow problems, it is extended for the domain Maxwell's equations naturally.In this paper, a high-order numerical method is used to solve the two-dimensional Maxwell's equations, where a CFD based DG method is employed for the spatial discretization and the 4-stage Runge-Kutta approach is used for time-stepping. In order to improve the efficiency, the Quadrature-Free implementation and the parallel computing based on mesh partitioning are used. Numerical tests indicate that highly-accurate solutions can be obtained when using high orders even on relative coarse grids. It is worth noting that this CFD-based high-order DG method for the Maxwell's equations is very suitable for complex geometries since it is implemented on unstructured mesh.