Journal of Physical Studies 25(1), Article 1401 [8 pages] (2021) DOI: https://doi.org/10.30970/jps.25.1401 NONLINEAR WAVE DYNAMICS OF A DISPERSE GRANULAR LAYER STIMULATED BY AN INWARDS MOVING PISTON Sergiy Mykulyak , Sergii Skurativskyi  Subbotin Institute of Geophysics, NAS of Ukraine, 63B, Bohdan Khmelnytskyi St., Kyiv, UA-03142, Ukraine, e-mail: mykulyak@ukr.net Received 22 April 2020; in final form 15 November 2020; accepted 16 October 2020; published online 16 February 2021

Three-dimensional simulations of wave propagation in a granular medium layer containing particles with polydisperse size distribution are performed using the discrete element method (DEM). The wave is generated by a piston subjected to an impulse load. It is shown that in the free surface layer, rotation wave structures are formed. Their location, time of occurrence and duration are determined using correlation analysis. These wave structures are revealed when the friction between the grains (particles) is incorporated and, moreover, the gravitation field resulting in the non-uniform distribution of the inter-particle force field is taken into account. The absence of the rotation wave formation is also shown when the inhomogeneity caused by the gravitational field is destroyed by vertical loading.

Key words: granular medium, nonlinear waves, rotation wave structure

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