This is sort of a follow-up to my wake question.  I have a flat plane and
I'm wanting to animate the ripples heading outward from a single
disturbance at x=0, y=0 and t=0.  I've had a wave theory class but that was
nearly 20 years ago.

Can someone tell me the function z = f(x,y,t) or maybe even just z = f(r,t).
 I'm comfortable with terms like "2D Wave Equation" and "Dirac Delta
Function" but I'm just a little too rusty to try and derive the solution
I'm after.  I'm pretty sure there is a close form solution to this problem
as I think I've seen it before but after two days of looking on-line I've
about given up.

Help,
Carl

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