This report demonstrates new functionality and applications enabled by the development of high-fidelity to low-fidelity (high-low) coupling for system simulations. Additionally, this development allows further exploration of the capabilities of the Risk Analysis Virtual Environment (RAVEN), a novel software framework, in the performance of uncertainty quantification in these high-low coupled system models. The work builds on previous work on high-low coupling that utilized COBRA-TF (CTF), the high-fidelity subchannel analysis code, with a low-fidelity model built in the system analysis code TRANSFORM, utilizing the Functional Mock-up Interface (FMI). Steady-state and transient analysis examples using the high-low coupled models generated from CTF and TRANSFORM/FMI are investigated. The workflows for in-memory and out-of-memory coupling are shown with specific applications to nuclear systems' uncertainty and system characterization studies. This work elucidates some of the potential benefits and future needs of using RAVEN for high-low system coupling analysis of energy systems.