This particular model presents a challenging scenario. There are two possible options to consider. The first option involves defining two phases, namely "Liquid" and "Gas," and specifying two species for the liquid phase, "water1" and "water2." The alternative option is to define three phases, as you have already done. Regardless of the chosen option, it will be necessary to write a User-Defined Function (UDF) to describe the mass transfer that occurs between the phases.
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Within the UDF, it is crucial to identify the cells located at the interface and incorporate source and sink terms for the different phases. This ensures that water1 and gas1 are consumed while water2 is produced. It is important to consider that when water2 is generated at the interface, water1 and gas1 are no longer in direct contact. This raises the question of how to define this interface in such a scenario.
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