Themis is a Python-based scientific workflow ensemble manager for running concurrent UQ simulations on high-performance computers. Using a simple, non-intrusive interface to simulation models, it provides the following capabilities:

• generating ensemble of simulations leveraging LC’s HPC resources
• analyzing ensemble of simulations output

Themis has been used for simulations in the domains of Inertial Confinement Fusion, National Ignition Facility experiments, climate, as well as other programs and projects.