For a point source at the origin, the three-dimensional neutron diffusion
equation becomes
2 2
-D▽ φ(ｒ) + K Dφ(ｒ) = Qδ(ｒ)
Apply a three-dimensional Fourier transform. Solve the transformed equation.
Transform the solution back into ｒ-space.
(註: D, K, Q都是常數)
不太會解三維的PDE，有高手能給點建議或是示範嗎?
謝謝!
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