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## [ff3d-users] trivial solution

**From**: |
Neil Christensen |

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

**Date**: |
Mon, 07 Mar 2005 14:38:22 -0500 |

**User-agent**: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040803 |

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] trivial solution**,
*Neil Christensen* **<=**