基于非结构Cartesian网格的电磁散射场计算  

Computation of electromagnetic scattering field based on unstructured Cartesian grids

作　　者：张兆[1] 沈孟育[1] 张涵信[2] 

机构地区：[1]清华大学航天航空学院,北京100084 [2]中国空气动力研究与发展中心,绵阳621000

出　　处：《清华大学学报（自然科学版）》2007年第11期2068-2071,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(90305012)

摘　　要：计算流体力学中的网格技术和数值方法对于计算电磁学的应用具有借鉴意义。该文结合计算流体力学中的数值方法,建立了基于非结构Cartesian网格上的时域有限体积法,用于求解电磁散射问题。为保证这种方法在时间和空间上具有二阶精度,在时间离散上采用二步Runge-Kutta方法,空间离散采用非结构的二阶NND格式。通过求解时域中的Maxwell方程组,计算了二维翼型和三维乘波体外形等典型完全导电散射体的雷达截面。计算结果表明:该方法计算精度高,适用于复杂外形的电磁散射问题的求解。A finite-volume time domain method based unstructured Cartesian grids was developed using computational fluid dynamics methods to solve the scattering problem of computational electromagnetics （CEM）, with second-order time accuracies achieved using a two-step Runge-Kutta scheme and second-order spatial accuracies obtained using a non-free-parameter and non-oscillation dissipation （NND） second-order scheme on unstructured grids. The scattering fields of some typical perfectly electrically conducting bodies, such as the 2-D airfoil and 3-D waverider configurations, were computed by solving the Maxwell equations in the time domain to obtain their radar cross sections. The results show that the method can be used to accurately solve CEM scattering problems for complex configurations.

关 键 词：计算电磁学 非结构Cartesian网格 雷达截面 时域有限体积法 NND格式 

分 类 号：O441[理学—电磁学]