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## Re: [ff3d-users] trivial solution

**From**: |
Mourad Ismail |

**Subject**: |
Re: [ff3d-users] trivial solution |

**Date**: |
Mon, 7 Mar 2005 21:24:30 +0100 |

**User-agent**: |
KMail/1.7.2 |

Hi,
I am not sure to have understood, but it seems obvious that you have the
trivial solution. Your problem doesn't have a unique solution!
The initial guess is 0 which is a solution of the problem.
A solution may be to add a radiation condition
Don't hesitate to tell me if I am mistaken.
Best regards,
Mourad
On Monday 07 March 2005 20:38, Neil Christensen wrote:
>* Hi,*
>* I am trying solve the pde:*
>
>* div(grad(phi)) + phi = 0*
>
>* with the boundary condition*
>
>* phi = 0 on <1,0,0>.*
>
>* As you know the analytic solution to this is*
>
>* phi = sum_i a_i cos(k_i . r) + b_i sin(k_i . r)*
>
>* where a_i, b_i and k_i are chosen such that the boundary condition is*
>* satisfied. In my first attempt, the boundary I used was a square. The*
>* problem is that when I run ff3d on it, I only get the trivial solution*
>* phi = 0. How can I get other solutions?*
>* Thank you,*
>* Neil*
>
>
>* _______________________________________________*
>* ff3d-users mailing list*
>* address@hidden*
>* http://lists.nongnu.org/mailman/listinfo/ff3d-users*
--
| Mourad Ismail
| Projet ONDES, INRIA-Rocquencourt
| Domaine de Voluceau-Rocquencourt
| B.P. 105, 78153 Le Chesnay Cedex
| Tél. 01 39 63 55 71 Fax 01 39 63 58 84
| http://www-rocq.inria.fr/~ismail

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