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Section B

Spurious caustics of dispersion-relation-preserving schemes

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Pages 2625-2636 | Received 26 Oct 2008, Accepted 22 Dec 2010, Published online: 25 May 2011
 

Abstract

A linear dispersive mechanism leading to a burst in the L norm of the error in numerical simulation of polychromatic solutions is identified. This local error pile-up corresponds to the existence of spurious caustics, which are allowed by the dispersive nature of the numerical error. From the mathematical point of view, spurious caustics are related to extrema of the numerical group velocity and are physically associated with interactions between rays defined by the characteristic lines of the discrete system. This paper extends our previous work about classical schemes to dispersion-relation preserving schemes.

2000 AMS Subject Classifications :

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