Christos Varsakelis

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In this paper we analyze the equilibrium limit of the constitutive model for two-phase granular mixtures introduced in Papalexandris (2004) [13], and develop an algorithm for its numerical approximation. At, equilibrium, the constitutive model reduces to a strongly coupled, overdetermined system of quasilinear elliptic partial differential equations with(More)
In this paper we report on numerical studies of unsteady, gravity-driven flow of a subaqueous erodible granular bed on an inclined plane. According to our simulations, the evolution of the flow can be partitioned in three phases. In the first phase, due to the onset of an interfacial instability, the material interface deforms into a series of long waves.(More)
Introduction: In the first part of this talk, we present an algorithm for the numerical treatment of twopressure, two velocity continuum models for heterogeneous, immiscible mixtures [1]. This algorithm has been employed in a numerical study of unsteady shear flows of fluid-saturated granular materials, as predicted by the continuum model of [2]. A(More)
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