For more information about this meeting, contact Stephanie Zerby, Mark Levi, Jinchao Xu.

Title: | Numerical Approximation of Asymptotically Disappearing Solutions of Maxwell's Equations |

Seminar: | CCMA Luncheon Seminar |

Speaker: | James Adler, Tufts University Mathematics |

Abstract: |

This work is on the numerical approximation of incoming solutions to Maxwell's equations, whose energy decays exponentially with time (asymptotically disappearing), meaning that the leading term of the back-scattering matrix becomes negligible. For the exterior of a sphere, such solutions are obtained by Colombini, Petkov and Rauch by specifying a maximal dissipative boundary condition on the sphere and setting appropriate initial conditions.
We consider a mixed finite element approximation of Maxwell's equations in the exterior of a polyhedron whose boundary approximates the sphere. We use the standard Nedelec-Raviart-Thomas elements and a Crank-Nicholson scheme to approximate the electric and magnetic fields. We set discrete initial conditions with standard interpolation, modified so that these initial conditions are divergence-free. We prove that with such initial conditions, the fully discrete approximation to the electric field is weakly divergence-free for all time. We show numerically that the finite-element solution approximates well the asymptotically disappearing solutions constructed analytically when the mesh size becomes small. |

### Room Reservation Information

Room Number: | MB114 |

Date: | 02 / 08 / 2013 |

Time: | 12:20pm - 01:30pm |