A locking free numerical approximation for quasilinear poroelasticity problems. (15th September 2020) - Zhang, Jingyuan
Abstract: This paper is devoted to a new formulation which couples the weak Galerkin method and the finite element method for approximating solutions of the equations of quasi-static poroelasticity which model flow through elastic porous media. It is assumed that the permeability of the elastic matrix depends nonlinearly on the dilatation of the porous medium. The steady-state version of the system is recast in terms of displacement, pressure, and volumetric stress, and the well-posedness of both the continuous and discrete three-field formulations is proved. Error estimates for the proposed numerical method are obtained. These show that the method is locking free . Numerical experiments presented further demonstrate the accuracy and the locking free characteristic of the proposed numerical method.