Skip to main content

ExaGRyPE

ExaGRyPE: Numerical General Relativity Solvers Based upon the Hyperbolic PDEs Solver Engine ExaHyPE

ExaGRyPE is an extension to ExaHyPE 2 which in turn is built on top of Peano 4. Peano provides the AMR meshing (as well as all other facilities that we need such as the data management, MPI and multithreading), ExaHyPE 2 provides all the hyperbolic solver tools on top of this, and ExaGRyPE finally tweaks and tailors these generic solvers towards numerical relativity.

The code is introduced in a paper in Computer Physics Communications 

@article{Zhang:2025:ExaGRyPE,
  title = {ExaGRyPE: Numerical general relativity solvers based upon the hyperbolic PDEs solver engine ExaHyPE},
  journal = {Computer Physics Communications},
  volume = {307},
  pages = {109435},
  year = {2025},
  issn = {0010-4655},
  doi = {https://doi.org/10.1016/j.cpc.2024.109435},
}

and the source code is now part of the the standard Peano 4 releases. If you download this code and add ExaHyPE as extension, you can directly reproduce all ExaGRyPE results and build your own ExaGRyPE applications. The code’s documentation holds tutorials and information on this.

As the code is shipped as extension to Peano, also all documentation is shipped as part of it. For a deep-dive, we recommend to get started with the tutorials.

@tobiasweinzierl.bsky.social

  • (no title)
    Registration for the Durham HPC Days is open: https://pay.durham.ac.uk/event-durham/durham-hpc-days-2025. The programme is also getting there: https://durham.readthedocs.io/en/latest/hpcdays/index.html We now have 4.5 days packed with talks, tutorials and workshops!
  • (no title)
    I realise we've never published our SIAM BGCE contribution on arXiv. Here it is: arxiv.org/abs/2504.15814 We study stationary black holes phrased as wave equations over an adaptive mesh. The solution should be stationary by definition, but it is subject to numerical instabilities. https://arxiv.org/abs/2504.15814
  • (no title)
    Closing date for our full professor position is approaching fast. Scientific computing colleagues, please apply: https://durham.taleo.net/careersection/du_mob/jobdetail.ftl?job=25000354
  • (no title)
    It is great to have several high profile speakers today at our AI for Science Day in collaboration with @nvidiaaidev.bsky.social and Dell.
  • (no title)
    This is a preprint I'm not involved in directly, but it is "nevertheless" worth reading if you are into reduced and mixed precision: arxiv.org/abs/2504.06889 https://arxiv.org/abs/2504.06889