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My friend does the boundary conditions that we apply in FDTD simulations absorb perfectly all the sacttered waves or untill some value they absorb do you know about this ? Because i ahve tried the ABCs of Gerrit Mur from the book of Kunz tehy don't absorb exactly, but at least the value of the scatterd wave become
around 0.00001 is this okey or i wrote the code wrong ? Thanks
with my best regards
Absorbing boundary conditions don't completly absorbe incident waves, but they reflect such a small part of the wave that they become a good aproximation of free space.
Assuming your incident wave has a value of 1, if your reflected wave has a value of 0.00001 as you said, your Absorbing boundary condition is working ok. In case you need even less reflection you could use Berenger's Perfectly matched layer.
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