Roll waves as relaxation oscillations

Author:

Razis Dimitrios1ORCID,Kanellopoulos Giorgos2ORCID,van der Weele Ko2ORCID

Affiliation:

1. Department of Civil Engineering, University of Thessaly 1 , Volos 38334, Greece

2. Department of Mathematics, University of Patras 2 , Patras 26500, Greece

Abstract

Granular roll waves consist of a long rising flank, followed by an abrupt fall. Based on this observation, we draw a parallel between roll waves and relaxation oscillations. From the generalized Saint-Venant equations, we derive a dynamical system governing the shape of the waves. Casting this system in the Liénard form, custom-made for studying relaxation oscillations, we find an analytical expression for the wavelength of roll waves as a function of their amplitude.

Publisher

AIP Publishing

Subject

Condensed Matter Physics,Fluid Flow and Transfer Processes,Mechanics of Materials,Computational Mechanics,Mechanical Engineering

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