A cell-centered implicit-explicit Lagrangian scheme for a unified model of nonlinear continuum mechanics on unstructured meshes

TL;DR

This paper introduces a cell-centered implicit-explicit Lagrangian finite volume scheme on unstructured meshes for a unified hyperbolic model of continuum mechanics, ensuring asymptotic preservation, high accuracy, and robustness across various material behaviors.

Contribution

It presents a novel scheme that unifies fluid and solid mechanics modeling with asymptotic preserving properties and high-order accuracy on unstructured grids.

Findings

Scheme accurately models diverse material responses.

Ensures asymptotic preservation of stiff relaxation limits.

Demonstrates robustness in multidimensional simulations.

Abstract

A cell-centered implicit-explicit updated Lagrangian finite volume scheme on unstructured grids is proposed for a unified first order hyperbolic formulation of continuum fluid and solid mechanics. The scheme provably respects the stiff relaxation limits of the continuous model at the fully discrete level, thus it is asymptotic preserving. Furthermore, the GCL is satisfied by a compatible discretization that makes use of a nodal solver to compute vertex-based fluxes that are used both for the motion of the computational mesh as well as for the time evolution of the governing PDEs. Second-order accuracy in space is achieved using a TVD piecewise linear reconstruction, while an implicit-explicit (IMEX) Runge-Kutta time discretization allows the scheme to obtain higher accuracy also in time. Particular care is devoted to the design of a stiff ODE solver, based on approximate analytical solutions of the governing equations, that plays a crucial role when the visco-plastic limit of the model is approached. We demonstrate the accuracy and robustness of the scheme on a wide spectrum of material responses covered by the unified continuum model that includes inviscid hydrodynamics, viscous heat conducting fluids, elastic and elasto-plastic solids in multidimensional settings.