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divergence modeling - numeric divergence equal zero

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computer1

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divergence modeling

Hi,people.
My question is about finite difference modeling of EM fields.
Exist some methods to force numeric divergence be zero,
not changing too much the overall field picture?
Like [E(x+dx,y,z) - E(x-dx,y,z)] / dx + [E(x,y+dy,z) - E(x,y-dy,z)] / dy + [E(x,y,z+dz) - E(x,y,z-dz)] / dz = 0.
Theoretically Maxwell equations maintain divergence stable,
but numeric errors accumulate.Or it maybe necessary setting initial field state.
Thanks in advance.
 

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