| Author |
Comment/Response |
Vish
|
 12/10/11 7:50pm
I am trying to solve the following spherical wave equation using NDSolve
D[U[r, t], t, t] == D[U[r, t], r, r] + 2/r*D[U[r,t],r]
with the following,4, initial/boundary conditions..
1)U[r,0]=Piinitial[r] *Pls see attachement this is rather complicated Piecewise function which is symmetric in the argument and smooth ..
2)Derivative[0, 1][U][r, 0] == 0
3)Derivative[1, 0][U][0, t] == 0
4)Derivative[1, 0][U][1000, t] == 0
I am unable to solve this system it returns..following errors
Infinity::indet: Indeterminate expression 0. ComplexInfinity encountered. >>
Power::infy: Infinite expression 1/0. encountered. >>
NDSolve::ndnum: Encountered non-numerical value for a derivative at t == 0.`. >>
Power::infy: Infinite expression 1/0. encountered. >>
General::stop: Further output of Power::infy will be suppressed during this calculation. >>
Infinity::indet: Indeterminate expression 0. ComplexInfinity encountered. >>
NDSolve::ndnum: Encountered non-numerical value for a derivative at t == 0.`. >>
I would be deeply grateful for any suggestions
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