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Electromagnetic Wave Scattering from Perfectly Conducting Moving BoundaryAn Application of the Body Fitted Grid Generation with Moving Boundary
Michiko KURODA
Publication
IEICE TRANSACTIONS on Electronics
Vol.E77C
No.11
pp.17351739 Publication Date: 1994/11/25 Online ISSN:
DOI: Print ISSN: 09168516 Type of Manuscript: Special Section PAPER (Special Issue on Electromagnetic Theory) Category: Keyword: grid generation, moving boundary, FDTD algorithm, scattering,
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Summary:
This paper presents a new numerical procedure for solving the scattering wave by the moving surface. Recently, the author and her colleagues have proposed a novel numerical procedure of grid generation having a coordinate line coincident with an arbitrarily shaped moving boundary. The time dependent curvilinear coordinate system which coincides with a contour of moving boundary in a physical region is transformed into fixed rectangular coordinate system. The simple form for the transformation is made possible to choose the function between the physical region and the rectangular computational region. The FDTD algorithm is exactly solved in this fixed rectangular coordinate system. In this paper, for the application of the FDTD algorithm to the body fitted grid generation with moving boundary, the stability criterion of FDTD algorithm for the body fitted grid generation with moving boundary in three dimensions is derived. The stability criterion is shown an upper bound for time step assuring stable numerical solutions. The study of scattering of electromagnetic and acoustic wave from a moving or a rotating body is very important for electromagnetic probing of moving body. The problem has been investigated in the past by numerous authors. One of them is solved by FDTD method, where the linear interpolation is introduced for the movement. By using the presented transformation technique where time component is added to the grid generation, the time depending coordinate system can be transformed into fixed rectangular coordinate system. Then the problems are directly solved by FDTD method in the transformed coordinate system. To verify this numemical technique, scattered field is evaluated in the case when a plane wave is normally incident on a moving perfectly conducting flat plate. The numerical results are compared with the exact ones and excellent agreement between them is obtained.


