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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
June 3, 2023 Youngsoo Choi will present at SIAM OP23
May 25, 2023 DD-NMROM preprint is available in arXiv
Mar 29, 2023 AAAI Spring Symposium was organized
Mar 10, 2023 gLaSDI open source code is available in gitHub
Mar 6, 2023 LaSDI open source code is available in gitHub
Feb 15, 2023 parametric DMD paper is published in JCP
Oct 17, 2022 Rayleigh-Taylor instability ROM paper is published in JCP
Oct 1, 2022 CWROM stress lattice paper is published in CMAME
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.