Homogenization of large deforming fluid-saturated porous structures

TL;DR

This paper develops a two-scale homogenization method for modeling large deformation behaviors in fluid-saturated porous media, capturing complex interactions between the hyperelastic skeleton and viscous fluid at the mesoscopic scale.

Contribution

It introduces a novel homogenization approach for large deformations in fluid-saturated porous structures within an Eulerian framework, incorporating incremental linearized models and finite element implementation.

Findings

Effective material properties are computed for large deformation scenarios.

Numerical simulations validate the homogenization approach.

The method captures complex fluid-structure interactions at the mesoscale.

Abstract

The two-scale computational homogenization method is proposed for modelling of locally periodic fluid-saturated media subjected a to large deformation induced by quasistatic loading. The periodic heterogeneities are relevant to the mesoscopic scale at which a double porous medium constituted by hyperelastic skeleton and an incompressible viscous fluid is featured by large contrasts in the permeability. Within the Eulerian framework related to the current deformed configuration, the two-scale homogenization approach is applied to a linearized model discretized in time, being associated with an incremental formulation. For this, the equilibrium equation and the mass conservation expressed in the spatial configuration are differentiated using the material derivative with respect to a convection velocity field. The homogenization procedure of the linearized equations provides effective (homogenized) material properties are computed to constitute the incremental macroscopic problem. The coupled algorithm for the multiscale problem is implemented using the finite element method. Illustrative 2D numerical simulations of a poroelastic medium are presented including a simple validation test.