Preprint 5/2012

Time-domain Dirichlet-to-Neumann map and its discretization

Lehel Banjai

Contact the author: Please use for correspondence this email.
Submission date: 16. Jan. 2012 (revised version: February 2012)
Pages: 24
published in: IMA journal of numerical analysis, 34 (2014) 3, p. 1136-1155 
DOI number (of the published article): 10.1093/imanum/drt032
MSC-Numbers: 65R20, 65L06
Keywords and phrases: Time-domain boundary integral operators, convolution quadrature, Dirichlet-to-Neumann operator
Download full preprint: PDF (231 kB)

In this work we address the wave equation in homogeneous, unbounded domains and its numerical solution. In particular we are interested in the effect that the shape of a bounded obstacle has on the quality of some numerical schemes for the computation of the exterior Dirichlet-to-Neumann map. We discretize the Dirichlet-to-Neumann map in time by convolution quadrature and investigate how the correct choice of time-step depends on the highest frequency present in the system, the shape of the scaterrer, and the type of convolution quadrature used (linear multistep or Runge-Kutta) and its convergence order.

18.10.2019, 02:15