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This feature is intended to model additional external moisture sources or sinks, such as those that would result from a chemical reaction like combustion where water is a reaction product, or from water phase change with a phase that is not modeled. In particular, this feature can be used to account for the additional vapor that would enter a hygroscopic porous medium due to the sublimation of snow flakes, since the solid water composing the snow flakes cannot be modeled with Moisture Transport interfaces. But it should not be used to model evaporation in a hygroscopic porous medium since liquid water is already modeled. The latter phase change automatically happens under the favorable conditions.
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Sources added with the Vapor Source feature are not automatically accounted for in coupled interfaces. That is, when using a Heat and Moisture coupling, if the generation or consumption of vapor is associated to a thermodynamic process that generates or consumes heat, it should be manually added in the Heat Transfer interface. In the same way, when using a Moisture Flow coupling, the vapor source is not added to the continuity equation.
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