The MOOSE Thermal Hydraulics Module

The Multiphysics Object-Oriented Simulation Environment (MOOSE) is an open-source object oriented finite element framework written in C++ (Lindsay et al., 2022). The Thermal
Hydraulics Module (THM) is an optional MOOSE physics module that provides capabilities for
studying thermal hydraulic systems. Its core capability lies in assembling a network of coupled
components, for instance, pipes, junctions, and valves.

THM provides several new systems to MOOSE to enable and facilitate thermal hydraulic simulations, most notably the Components system, which provides a higher-level syntax to MOOSE’s lower-level objects. This system is extensible by the user, but the current library primarily includes components based on a one-dimensional, single-phase, variable-area, compressible flow model, as well as heat conduction.