An Asymmetrical Mixed Higher-Order Discontinuous Galerkin Time Domain Method for Electromagnetic Scattering from the Plasma Sheath around a Hypersonic Vehicle

IF 1.2 4区计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Antennas and Propagation Pub Date : 2023-09-26 DOI:10.1155/2023/6223384

Jirong Guo, Yiping Han

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引用次数: 0

Abstract

The plasma sheath during reentry of hypersonic vehicle is an unmagnetized and weakly ionized nonuniform plasma flow, which causes radio frequency blackout and strong plasma attenuation of electromagnetic wave. The physical properties of the nonuniform plasma flow were obtained using computational fluid dynamics software with unstructured grids. In this study, a detailed computational model was reconstructed with the high-order Lagrange grids for the nonuniform plasma flow region and the high-order Serendipity grids for the homogeneous medium region. In order to calculate the numerical flux between the two types of grids in the discontinuous Galerkin time domain (DGTD) algorithm, an asymmetric high-order element is constructed as a transition unit. Finally, the simulation results in the plasma sphere show that the above method improves the computational accuracy and decreases calculation. The amplitude and scattering about electromagnetic wave in nonuniform plasma flow are clarified in detail. It is suggested that the presented method could be an effective tool for investigating interaction between electromagnetic waves and plasma flow.

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高超声速飞行器等离子体鞘层电磁散射的非对称混合高阶不连续伽辽金时域方法

高超声速飞行器再入过程中的等离子体鞘层是一种非磁化弱电离的非均匀等离子体流，导致射频中断和电磁波的强等离子体衰减。利用非结构网格计算流体动力学软件，得到了非均匀等离子体流动的物理性质。本文采用高阶拉格朗日网格和高阶Serendipity网格分别对非均匀等离子体流区和均匀介质区进行了详细的计算模型重建。为了在不连续伽辽金时域(DGTD)算法中计算两种网格之间的数值通量，构造了一个非对称高阶单元作为过渡单元。最后，在等离子体球中的仿真结果表明，该方法提高了计算精度，减少了计算量。详细地阐明了电磁波在非均匀等离子体流中的振幅和散射。该方法可作为研究电磁波与等离子体流相互作用的有效工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Antennas and Propagation ENGINEERING, ELECTRICAL & ELECTRONIC-TELECOMMUNICATIONS

CiteScore

3.10

自引率

13.30%

发文量

158

审稿时长

3.8 months

期刊介绍： International Journal of Antennas and Propagation publishes papers on the design, analysis, and applications of antennas, along with theoretical and practical studies relating the propagation of electromagnetic waves at all relevant frequencies, through space, air, and other media. As well as original research, the International Journal of Antennas and Propagation also publishes focused review articles that examine the state of the art, identify emerging trends, and suggest future directions for developing fields.