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Oxy‐fuel combustion is another technology that has also received a great share of attention in terms of CFD modeling, given its future potential as an economically viable carbon capture technique [48]. In burning fuel in an (almost pure) oxygen atmosphere instead of air, the products of the reaction are mainly water vapor and carbon dioxide. This results in extraordinary ease of separation of CO₂ from the exhaust gas stream. CFD models of oxy‐combustion systems do not have a different setup from other combustion models, which consist mainly in a single‐phase, multispecies setup where the relevant reaction kinetics need to be specified. It is worth mentioning however that radiation models need to be incorporated because of the high temperatures attained within the burning chamber. Exceptions to the common single‐phase approach are the study of oxy‐fuel combustion of solid particulate fuels such as the work presented by Wu et al. [49], where the Eulerian approach discussed earlier was implemented in order to track the movement of the solid phase, and the work of Bhuiyan and Naser [50], who applied the Eulerian–Lagrangian method. Table 2.3 summarizes some recent CFD studies in oxy‐fuel technologies. Also, a look at the literature shows that some reported studies on oxy‐fuel CFD simulations have been combined with process simulations in co‐simulation strategies. Such is the work published by Edge et al. [54] and Fei et al. [55]. Co‐simulation is the object of the Section 2.8, where it will be discussed further because it can give way to enhanced numerical predictions with implications also in control engineering.