Artificial boundary conditions for certain evolution PDEs with cubic nonlinearity for non-compactly supported initial data

Authors:
V. Vaibhav
Affiliations:
Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Staudtstr. 7/B2 91058 Erlangen, Germany and Max Planck Institute for the Science of Light, Günther-Scharowsky ...
Venue:
Journal of Computational Physics
Year:
2011

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Abstract

The paper addresses the problem of constructing non-reflecting boundary conditions for two types of one dimensional evolution equations, namely, the cubic nonlinear Schrodinger (NLS) equation, @?"tu+Lu-i@g|u|^2u=0 with L=-i@?"x^2, and the equation obtained by letting L=@?"x^3. The usual restriction of compact support of the initial data is relaxed by allowing it to have a constant amplitude along with a linear phase variation outside a compact domain. We adapt the pseudo-differential approach developed by Antoine et al. (2006) [5] for the NLS equation to the second type of evolution equation, and further, extend the scheme to the aforementioned class of initial data for both of the equations. In addition, we discuss efficient numerical implementation of our scheme and produce the results of several numerical experiments demonstrating its effectiveness.