DoD Stabilization for non-linear hyperbolic conservation laws on cut cell meshes in one dimension

TL;DR

This paper introduces a Domain of Dependence stabilization method for hyperbolic conservation laws on cut cell meshes, improving stability and convergence in one-dimensional simulations with complex geometries.

Contribution

The work develops a novel DoD stabilization technique that effectively handles stability issues on cut cell meshes for hyperbolic conservation laws in 1D.

Findings

Monotone scheme for scalar problems with piecewise constant polynomials.

Convergence orders of p+1 for smooth flows with higher polynomial degrees.

Robust shock behavior demonstrated in numerical experiments.

Abstract

In this work, we present the Domain of Dependence (DoD) stabilization for systems of hyperbolic conservation laws in one space dimension. The base scheme uses a method of lines approach consisting of a discontinuous Galerkin scheme in space and an explicit strong stability preserving Runge-Kutta scheme in time. When applied on a cut cell mesh with a time step length that is appropriate for the size of the larger background cells, one encounters stability issues. The DoD stabilization consists of penalty terms that are designed to address these problems by redistributing mass between the inflow and outflow neighbors of small cut cells in a physical way. For piecewise constant polynomials in space and explicit Euler in time, the stabilized scheme is monotone for scalar problems. For higher polynomial degrees $p$, our numerical experiments show convergence orders of $p+1$ for smooth flow and robust behavior in the presence of shocks.