 The reactivity-controlled compression ignition, RCCI, engine is a promising technology for reducing both nitrogen oxide, NOx, and particulate matter, PM, emissions from diesel engines. It works by injecting two different fuels at different locations within the cylinder, resulting in a stratified mixture of reactivities which allows for better control of the combustion process. Operating parameters such as fuel reactivity, injection timing, and exhaust gas recirculation ratio can be adjusted to optimize performance and emissions. Computational fluid dynamics, CFD, simulations have been used to study the effects of these parameters on the combustion process and emissions. Further improvements in the CFD models are needed to accurately predict the behavior of RCCI engines. Future research should focus on optimizing the combustion process and improving the accuracy of the CFD models. This article was... We are article.tv, links in the description below.