neXtSIM-DG: The next-generation discontinuous Galerkin sea ice model

NeXtSIM-DG is a novel sea ice model developed as part of the Scale Aware Sea Ice Project (SASIP).The continum model supports both the established viscous plastic rheology (mEVP) and the Brittle Bingham-Maxwell rheology (BBM). The discretization is based on higher-order discontinuous and continuous finite elements to accurately represent the sharp features of sea ice. Quadrilateral parametric meshes with regular topology are used to allow for easy coupling with ocean models and a highly efficient implementation.Following best practices in software engineering, the C++ code is designed to be maintainable and easily extendable, with a modular design that allows users to add new physics implementations.In this poster, we give an overview of neXtSIM-DG and present recent developments regarding its usability and performance. We demonstrate our model's heterogeneous compute capabilities, supporting shared-memory parallelization with OpenMP, full GPU acceleration through Kokkos and scaling across multiple CPUs via MPI.