Math @ Duke

Publications [#220956] of Stephanos Venakides
Papers Published
 Oscar P. Bruno, Stephen P. Shipman, Catalin Turc, Stephanos Venakides, Efficient Evaluation of Doubly Periodic Green Functions in 3D Scattering, Including Wood Anomaly Frequencies,
ArXiv>Mathematics > Analysis of PDEs
(July 4, 2013) [arXiv:1307.1176]
(last updated on 2013/12/20)
Abstract: We present efficient methods for computing wave scattering by diffraction gratings that exhibit twodimensional periodicity in three dimensional (3D) space. Applications include scattering in acoustics, electromagnetics and elasticity. Our approach uses boundaryintegral equations. The quasiperiodic Green function is a doubly infinite sum of scaled 3D freespace outgoing Helmholtz Green functions. Their source points are located at the nodes of a periodicity lattice of the grating.
For efficient numerical computation of the lattice sum, we employ a smooth truncation. Superalgebraic convergence to the Green function is achieved as the truncation radius increases, except at frequencywavenumber pairs at which a Rayleigh wave is at exactly grazing incidence to the grating. At these "Wood frequencies", the term in the Fourier series representation of the Green function that corresponds to the grazing Rayleigh wave acquires an infinite coefficient and the lattice sum blows up.
At Wood frequencies, we modify the Green function by adding two types of terms to it. The first type adds weighted spatial shifts of the Green function to itself with singularities below the grating; this yields algebraic convergence. The secondtype terms are quasiperiodic plane wave solutions of the Helmholtz equation. They reinstate (with controlled coefficients) the grazing modes, effectively eliminated by the terms of first type. These modes are needed in the Green function for guaranteeing the wellposedness of the boundaryintegral equation that yields the scattered field.
We apply this approach to acoustic scattering by a doubly periodic 2D grating near and at Wood frequencies and scattering by a doubly periodic array of scatterers away from Wood frequencies.


dept@math.duke.edu
ph: 919.660.2800
fax: 919.660.2821
 
Mathematics Department
Duke University, Box 90320
Durham, NC 277080320

