14-17 May 2018
New Orleans
US/Central timezone

An alternative model of multicomponent diffusion based on a combination of the Maxwell-Stefan theory and continuum mechanics

17 May 2018, 14:20
15m
New Orleans

New Orleans

Oral 20 Minutes MS 2.02: Modeling and simulation of subsurface flow at various scales Parallel 11-H

Speaker

Jiří Mikyška (Czech Technical University in Prague)

Description

We present a theory of multicomponent mixtures which does not employ any splitting of component fluxes into convective and diffusive parts. Instead, momentum balance is formulated individually for each component in which both 1) viscous friction within a component, and 2) momentum exchange among different components, are taken into account. While the viscous friction is described using the Newtonian stress tensor, the Maxwell-Stefan theory is used to describe the momentum exchange among different components. When the viscosity is neglected, the model of ideal mixture of ideal gases leads to a hyperbolic system of conservation laws. For the non-ideal mixtures, we obtain a first-order system in a non-conservative form. A simplified version of the model is discretized using a combination of the finite volume method and the mixed-hybrid finite element method. Numerical examples are provided to show typical behavior of the solution of the model equations.

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Primary authors

Jan Franců Jiří Mikyška (Czech Technical University in Prague)

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