Ryujin is a high-performance high-order collocation-type finite-element solver for conservation equations such as the compressible Navier-Stokes and Euler equations of gas dynamics. The solver is based on the convex limiting technique to ensure invariant domain preservation and uses the finite element library deal.II (website) and the vector class SIMD library. As such the solver maintains important physical invariants and is guaranteed to be stable without the use of ad-hoc tuning parameters.
Ryujin is freely available under the terms of the Apache License 2.0 with LLVM Exception. Part of the contributed source code, third-party dependencies and header libraries are covered by different open source licenses. For details consult COPYING.md. Contributions to the ryujin source code are governed by the Developer Certificate of Origin version 1.1; see CONTRIBUTING.md for details.
Documentation, installation and usage instructions, references, and contact information can be found on the project website: