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Pre-built packages of the OpenCourant solver, published straight from the project's continuous delivery pipeline. Everything here is free software under the GNU AGPL v3.

latest-20261006 published October 7, 2026 · view on GitHub

Latest release

Release notes for latest-20261006

This automatic release is built from commit 33e685176cccf0c539a3ce07aa2096985a284e2a, authored by @brianclemens. GitHub Actions workflow run that built this release

Commit message:

CI: integrate linuxa64 into post-merge CI and the delivery pipeline (#26)

With the v70 ARM reader (extlib v82-hybrid-r4), linuxa64 passes the full
MiniQA suite (81/81, ARM CI run 37390617479), so ARM graduates from the
dispatch-only spike:

- PR Merge CI MAIN: build_linuxa64 (6 variants, ubuntu-24.04-arm,
  ghcr.io/opencourant/linuxa64-bld-qa) + qa_linuxa64
- Delivery stable CI: build_linuxa64 + build_tools_linuxa64 (native ARM
  converters + aarch64 GCC runtime libs) + qa_release_linuxa64 gate +
  package_linuxa64 (OpenCourant_linuxa64.zip) + selftest_linuxa64 (bare
  Rocky Linux 8.10 arm64 container, packaged libraries only); the
  release gains the linuxa64 asset and arm64 quick-start notes

Linux x86_64 package

Unzip OpenCourant_linux64.zip and set:

export OPENCOURANT_PATH=/path/to/OpenCourant
export LD_LIBRARY_PATH=$OPENCOURANT_PATH/extlib/hm_reader/linux64:$OPENCOURANT_PATH/extlib/h3d/lib/linux64:$LD_LIBRARY_PATH
export RAD_CFG_PATH=$OPENCOURANT_PATH/hm_cfg_files

Executables are in exec/ (Starter and Engine in single and double precision, SMP and OpenMPI, plus anim_to_vtk and th_to_csv converters).

Windows x86_64 package

Unzip OpenCourant_win64.zip and set (cmd.exe):

set OPENCOURANT_PATH=C:\path\to\OpenCourant
set PATH=%OPENCOURANT_PATH%\extlib\hm_reader\win64;%OPENCOURANT_PATH%\extlib\h3d\lib\win64;%OPENCOURANT_PATH%\extlib\intelOneAPI_runtime\win64;%PATH%
set RAD_CFG_PATH=%OPENCOURANT_PATH%\hm_cfg_files
set KMP_STACKSIZE=400m

The required Intel runtime libraries, including the Intel MPI runtime, are shipped in extlib/intelOneAPI_runtime/win64 (Intel Simplified Software License, see the bundled license directory). Single-node MPI runs need no setup:

mpiexec -localonly -np 4 %OPENCOURANT_PATH%\exec\engine_win64_impi.exe -i MODEL_0001.rad

For the classic service-based launcher run hydra_service.exe -install once as administrator and use mpiexec -delegate; multi-node clusters should install the full Intel MPI runtime.

Containers

Multi-arch (x86-64 + arm64) images, OpenMPI included:

docker.io/opencourant/opencourant:latest-20261006
ghcr.io/opencourant/opencourant:latest-20261006

Apptainer users can download OpenCourant_linux64.sif / OpenCourant_linuxa64.sif below, or pull the image directly:

apptainer pull opencourant.sif docker://ghcr.io/opencourant/opencourant:latest-20261006

Linux arm64 package

Unzip OpenCourant_linuxa64.zip and set:

export OPENCOURANT_PATH=/path/to/OpenCourant
export LD_LIBRARY_PATH=$OPENCOURANT_PATH/extlib/hm_reader/linuxa64:$OPENCOURANT_PATH/extlib/h3d/lib/linuxa64:$LD_LIBRARY_PATH
export RAD_CFG_PATH=$OPENCOURANT_PATH/hm_cfg_files

Notes

The Linux _ompi Engines require OpenMPI 4.1.2 installed in /opt/openmpi (see INSTALL.md); the SMP Engines run standalone
/ALE/STRUCTURED_MESH is not supported by the recovered input readers and is rejected explicitly

Thank you for using OpenCourant! 👉 Share your feedback on the OpenCourant forum

Linux x86-64
OpenCourant_linux64.zip
Download
Size
80.0 MiB
Downloads
56
SHA-256
9d67531de156dd9beba05fbfe710dcdc2bcecbdf3dc3a12642cf85dcece80081
Starter and Engine in single and double precision, SMP and OpenMPI builds, plus the anim_to_vtk and th_to_csv converters and the launcher GUI. The _ompi Engines require OpenMPI 4.1.2; the SMP Engines run standalone.
Linux arm64
OpenCourant_linuxa64.zip
Download
Size
79.5 MiB
Downloads
23
SHA-256
0d7003e1ab2a79b46f26596ce49e1e585e9721662c917d23ad6509cce0990f80
Starter and Engine in single and double precision, SMP and OpenMPI builds, plus the anim_to_vtk and th_to_csv converters and the launcher GUI. The _ompi Engines require OpenMPI 4.1.2; the SMP Engines run standalone.
Windows x86-64
OpenCourant_win64.zip
Download
Size
334.1 MiB
Downloads
153
SHA-256
8fa8d854b489b2732431c129107e0e846b89594f1bb3603da01ab24c0a98041c
Starter and Engine in single and double precision, SMP and Intel MPI builds, plus the converters and the launcher GUI. The Intel MPI runtime is bundled, so single-node mpiexec runs need no extra setup. Set KMP_STACKSIZE=400m before running.

Containers

If you’d rather not manage paths and runtimes at all, pull the solver as a container. Images are multi-arch (x86-64 and arm64 in one tag), include the OpenMPI runtime, and are built from the exact packages above — they publish only after the same regression suite passes. Both registries carry identical images:

docker.io/opencourant/opencourant
ghcr.io/opencourant/opencourant

Use latest for the newest stable build, or pin a release with its dated tag, for example latest-20261006.

Docker or Podman

Run from the directory that contains your input files:

docker run --rm -v $PWD:/work -e OMP_NUM_THREADS=4 \
    opencourant/opencourant starter -i MODEL_0000.rad -np 1
docker run --rm -v $PWD:/work -e OMP_NUM_THREADS=4 \
    opencourant/opencourant engine -i MODEL_0001.rad

MPI runs work out of the box:

docker run --rm -v $PWD:/work -e OMP_NUM_THREADS=2 \
    opencourant/opencourant mpiexec -np 4 engine_ompi -i MODEL_0001.rad

The executables are on PATH under convenience names: starter, engine, engine_ompi (plus _sp single-precision variants), together with the converters.

Apptainer

On HPC systems, pull the same image as a SIF:

apptainer pull opencourant.sif docker://ghcr.io/opencourant/opencourant:latest
apptainer exec opencourant.sif starter -i MODEL_0000.rad -np 4
apptainer exec opencourant.sif mpiexec -np 4 engine_ompi -i MODEL_0001.rad

Or download a prebuilt SIF directly, built and tested by the same pipeline:

Linux x86-64
OpenCourant_linux64.sif
Download .sif
Size
162.4 MiB
Downloads
9
SHA-256
6916dd3ef6af53bcd3ac393d9addd63499f0b58963dc21ef5df675c1701d83ce
Linux arm64
OpenCourant_linuxa64.sif
Download .sif
Size
160.7 MiB
Downloads
6
SHA-256
22ba5f9b2e8f77ee1e5bfcce5f68f7ba7c3e1ad69b59be50c047e34757f1e5ca

Definition files, including one that compiles from source instead, live in the repository’s Apptainer/ directory.

Verifying your download

Every package is published with a SHA-256 digest recorded by GitHub at upload time. Compare it against the archive you downloaded:

sha256sum OpenCourant_linux64.zip

On Windows:

certutil -hashfile OpenCourant_win64.zip SHA256

Getting started

Unpack the archive and point the solver at its own runtime files. The paths differ per platform. If you would rather not configure anything, the container image above has all of this preset already.

Linux x86-64

export OPENCOURANT_PATH=/path/to/OpenCourant
export LD_LIBRARY_PATH=$OPENCOURANT_PATH/extlib/hm_reader/linux64:$OPENCOURANT_PATH/extlib/h3d/lib/linux64:$LD_LIBRARY_PATH
export RAD_CFG_PATH=$OPENCOURANT_PATH/hm_cfg_files

Linux arm64

export OPENCOURANT_PATH=/path/to/OpenCourant
export LD_LIBRARY_PATH=$OPENCOURANT_PATH/extlib/hm_reader/linuxa64:$OPENCOURANT_PATH/extlib/h3d/lib/linuxa64:$LD_LIBRARY_PATH
export RAD_CFG_PATH=$OPENCOURANT_PATH/hm_cfg_files

Windows x86-64

From cmd.exe:

set OPENCOURANT_PATH=C:\path\to\OpenCourant
set PATH=%OPENCOURANT_PATH%\extlib\hm_reader\win64;%OPENCOURANT_PATH%\extlib\h3d\lib\win64;%OPENCOURANT_PATH%\extlib\intelOneAPI_runtime\win64;%PATH%
set RAD_CFG_PATH=%OPENCOURANT_PATH%\hm_cfg_files
set KMP_STACKSIZE=400m

The required Intel runtime libraries ship inside the package, under extlib/intelOneAPI_runtime/win64. That includes the Intel MPI runtime, so single-node MPI runs need no further setup:

mpiexec -localonly -np 4 %OPENCOURANT_PATH%\exec\engine_win64_impi.exe -i MODEL_0001.rad

Afterwards

The Starter and Engine executables live in exec/, alongside the anim_to_vtk and th_to_csv converters. Full instructions, including the OpenMPI requirement for the _ompi Engines on Linux, are in INSTALL.md.

Building from source

The solver builds on Linux with GCC and GFortran, and on Windows with the Intel oneAPI toolchain. Clone the repository and follow HOWTO.md, which covers the prerequisites, the OpenMPI setup, and the build scripts.

Something missing?

If a package you relied on under OpenRadioss is not here, say so. It helps us prioritise. Start a thread on the forum, open an issue on GitHub, or find us in the chat.

Previous releases

The delivery pipeline keeps the three most recent builds and prunes older tags. If you need a specific historical build, pin the commit and build from source.

Release	Published	Packages	Downloads
latest-20261005	October 5, 2026	linux64 win64	117
latest-20261003	October 3, 2026	linux64	34

This page is generated at build time from the GitHub Releases API and is rebuilt daily; it was last checked on October 8, 2026. The authoritative list is always OpenCourant/OpenCourant/releases.