There is extensive interest in using H2 as a fuel to power internal combustion engines (ICEs) and gas turbines (GTs). Several OEMs are either working on or have released prototype engines that use H2 as a fuel. H2 poses several modeling challenges for CFD, including its high injection velocities, low density, high mass diffusivity in air, wide flammability range, high burning velocities, and low ignition energy. In this lecture, we will show how CONVERGE is uniquely suited to address these challenges in relation to various applications, such as flashback control in dual-fuel ICEs and GTs, lean blow-off (LBO) in GTs, accurate NOx modeling in ICEs, and transition to detonation in rotating detonation engines (RDEs). *This session includes hands-on CONVERGE Studio practice. PREREQUISITES Introduction to CONVERGE (or equivalent introductory CONVERGE training course)