Student Support Forum: 'Spherical Wave solution using NDSolve..' topicStudent Support Forum > General > "Spherical Wave solution using NDSolve.."

 Next Comment > Help | Reply To Topic
 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 Attachment: help_forum.nb, URL: ,

 Subject (listing for 'Spherical Wave solution using NDSolve..') Author Date Posted Spherical Wave solution using NDSolve.. Vish 12/10/11 7:50pm Re: Spherical Wave solution using NDSolve.. Quinn McKinsey 12/17/11 09:49am
 Next Comment > Help | Reply To Topic