A spectral method for dispersive solutions of the nonlocal Sine-Gordon equation

TL;DR

This paper introduces a spectral numerical method combining Chebyshev polynomials and Stormer-Verlet scheme to accurately analyze dispersive nonlocal solutions of the Sine-Gordon equation in a peridynamic context.

Contribution

The work develops a novel spectral method for solving the nonlocal Sine-Gordon equation, enabling precise analysis of dispersive features in peridynamic models.

Findings

Spectral method achieves high numerical accuracy.

Dispersive effects of the nonlocal kernel are demonstrated.

Internal energy behavior of the peridynamic operator is analyzed.

Abstract

Moved by the need for rigorous and reliable numerical tools for the analysis of peridynamic materials, the authors propose a model able to capture the dispersive features of nonlocal soliton-like solutions obtained by a peridynamic formulation of the Sine-Gordon equation. The analysis of the Cauchy problem associated to the peridynamic Sine-Gordon equation with local Neumann boundary condition is performed in this work through a spectral method on Chebyshev polynomials nodes joined with the Stormer-Verlet scheme for the time evolution. The choice for using the spectral method resides in the resulting reachable numerical accuracy, while, indeed, Chebyshev polynomials allow straightforward implementation of local boundary conditions. Several numerical experiments are proposed for thoroughly describe the ability of such scheme. Specifically, dispersive effects of the specific peridynamic kernel are demonstrated, while the internal energy behavior of the specified peridynamic operator is studied.