Iterative solvers for Biot model under small and large deformation
Provides iterative solvers for the nonlinear Biot model in poromechanics, but the contribution is incremental as it applies known linearization techniques to a specific model.
The paper proposes Newton and L-scheme linearization methods for solving the Biot model under small and large deformation, proving convergence for small deformation and demonstrating applicability for large deformation via numerical examples.
We consider L-scheme and Newton based solvers for Biot model under small or large deformation. The mechanical deformation follows the Saint Venant-Kirchoff constitutive law. Further, the fluid compressibility is assumed to be nonlinear. A Lagrangian frame of reference is used to keep track of the deformation. We perform an implicit discretization in time (backward Euler) and propose two linearization schemes for solving the nonlinear problems appearing within each time step: Newton's method and L-scheme. The linearizations are used monolithically or in combination with a splitting algorithm. The resulting schemes can be applied for any spatial discretization. The convergences of all schemes are shown analytically for cases under small deformation. Illustrative numerical examples are presented to confirm the applicability of the schemes, in particular, for large deformation.