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libROM is a free, lightweight, scalable C++ library for data-driven physical simulation methods. It is the main tool box that the reduced order modeling team at LLNL uses to develop efficient model order reduction techniques and physics-constrained data-driven methods. We try to collect any useful reduced order model routines, which are separable to the high-fidelity physics solvers, into libROM. Plus, libROM is open source, so anyone is welcome to suggest new ideas or contribute to the development. Let's work together for better data-driven technology!


Many more features will be available soon. Stay tuned!

libROM is used in many projects, including BLAST, ARDRA, Laghos, SU2, ALE3D and HyPar. Many MFEM-based ROM examples can be found in Examples.

See also our Gallery, Publications and News pages.


Date Message
Oct 17, 2022 Rayleigh-Taylor instability ROM paper is published in JCP.
Sep 30, 2022 Youngsoo Choi will present at SIAM MDS22
Sep 28, 2022 Dylan Copeland will present at SIAM MDS22
Sep 27, 2022 Siu Wun Cheung will present at SIAM MDS22
May 19, 2022 CWROM stress lattice preprint is available in arXiv.
Apr 26, 2022 gLaSDI preprint is available in arXiv.
Apr 26, 2022 parametric DMD preprint is available in arXiv.
Mar 29, 2022 S-OPT preprint is available in arXiv.
Nov 19, 2021 NM-ROM paper is published in JCP.
Nov 10, 2021 Laghos ROM is published at CMAME.

libROM tutorials in YouTube

Date Title
July 22, 2021 Poisson equation & its finite element discretization
Sep. 1, 2021 Poisson equation & its reduced order model
Sep. 23, 2021 Physics-informed sampling procedure for reduced order models
Sep. 11, 2022 Local reduced order models and interpolation-based parameterization
Sep. 23, 2022 Projection-based reduced order model for nonlinear system

Latest Release

ExamplesCode documentationSources


Building libROMPoisson equationGreedy for Poisson

New users should start by examining the example codes and tutorials.

We also recommend using GLVis or VisIt for visualization.


Use the GitHub issue tracker to report bugs or post questions or comments. See the About page for citation information.