There is extensive interest in using H2 as a fuel to power internal combustion (IC) engines. Several OEMs are either working on or have released prototype engines that use H2 as a fuel. H2 poses a variety of modeling challenges for CFD, stemming from its high injection velocities, low density, high mass diffusivity in air, wide flammability range, high burning velocities, and low ignition energy. In this hands-on training session, we will show how CONVERGE is uniquely suited to address these challenges in relation to IC engine applications, including flame flashback control in dual-fuel IC engines and accurate NOx modeling.