2.3FDTD的稳定性条件 CFL Condition(Courant, Friedrichs, Lewy △t nc 一般取 2021/12/10
11 CFL Condition (Courant, Friedrichs, Lewy ) 2.3 FDTD的稳定性条件 0 x t nc 一般取 0 2 x t c = 2021/12/10
24一维FDTD的吸收边界条件 Graphs of Ex at Various Time Steps t=200 t=225 t=250 t=275 t=300 2021/12/10 12
12 2.4 一维FDTD的吸收边界条件 2021/12/10
一个时间步,电磁波走过的距离 distance=△t=c=4x=m△x4sAx 2 This value of n motivates Sullivan 's choice of boundary conditions at the left boundary given by E 2 Similarly, for the right boundary conditions we use E"( (max space)=F-2 max space 2021/12/10 13
13 一个时间步，电磁波走过的距离 0 2 x t c = This value of η motivates Sullivan's choice of boundary conditions at the left boundary given by ( ) ( ) 2 1 2 n n E E x x − = Similarly, for the right boundary conditions we use ( ) ( ) 2 (max_space (max_space -1 n n E E x x − = 2021/12/10
The algorithm is augmented by saving the value E(2) for two time steps and replacing the current boundary condition, E(1); with this value and like-wise for the right boundary. We illustrate in the following figure Left absorbing Boundary Conditions grid time step n+ two time step nt5 one 7+ alue saved n,+ E(1)E(2)
The algorithm is augmented by saving the value E(2) for two time steps and replacing the current boundary condition, E(1); with this value and like-wise for the right boundary. We illustrate in the following figure