The Clawpack 5.x software

Clawpack is a software package designed to solve nonlinear hyperbolic partial differential equations using high-resolution finite volume methods based on Riemann solvers and limiters. The package includes a number of variants aimed at different applications and user communities. Clawpack has been actively developed as an open source project for over 20 years. The latest major release, Clawpack 5, introduces a number of new features and changes to the code base and a new development model based on GitHub and Git submodules. This article provides a summary of the most significant changes, the rationale behind some of these changes, and a description of our current development model. ; Funding sources that lead to the creation of the Clawpack software package include NSF grants DMS-1216732, DMS-1419108, and EAR-1331412, DOE Office of Advanced Scientific Computing grant DE-FG02-88ER25053, and KAUST OCRF grant 2156 CRG3. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.