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Non-uniform grid finite-difference time-domain method for the simulation of electromagnetic distributions

机译:模拟电磁分布的非均匀网格有限差分时域方法

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To solve the memory requirement problem of the FDTD method some previous studies presented subgridding methods that employ two different grid sizes to divide the calculation space. With small structures or on the boundary of different materials a small grid size is used, otherwise a large grid size is used. There are two types of subgridding: the mesh refinement algorithm (MRA) and the variable step size method (VSSM). The MRA makes two runs resulting in a longer computing time. The VSSM varies the step from area to area; this limits its applicability. Both methods use a coarse grid as the boundary of the refinement grid; because the coarse grid is not accurate this affected the refinement result. As a development of the VSSM, the article presents a non-uniform method that can freely use any grid size in the computation area only that the grids are integer times each other. The non-uniform method uses the adjacent grid as the boundary of a smaller grid size, this increases the calculation accuracy. A simulation study of a human thigh section in microwave hyperthermia was examined by this method.
机译:为了解决FDTD方法的内存需求问题,一些先前的研究提出了细分方法,该方法使用两种不同的网格大小来划分计算空间。对于较小的结构或在不同材料的边界上,将使用较小的网格大小,否则将使用较大的网格大小。有两种类型的子网格:网格细化算法(MRA)和可变步长方法(VSSM)。 MRA进行两次运行会导致更长的计算时间。 VSSM因地区而异。这限制了它的适用性。两种方法都使用粗网格作为细化网格的边界。因为粗网格不准确,这影响了精化结果。作为VSSM的发展,本文提出了一种非均匀方法,该方法可以自由使用计算区域中的任何网格大小,只要网格是彼此的整数倍即可。非均匀方法使用相邻网格作为较小网格尺寸的边界,这提高了计算精度。用这种方法对人的大腿部分进行微波热疗的模拟研究进行了检验。

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