HydroGeoSphere/Immiscible Phase Dissolution Source

An immiscible phase dissolution source is one in which it is assumed that there is dissolution of an immobile liquid or solid phase into the subsurface water until all dissolvable material is exhausted. The following instruction can be used to define the source:

Immiscible phase dissolution data

 * 1) diss_mass Mass of dissolvable material per unit volume of porous medium.
 * 2) diss_conc The aqueous solubility value for the immiscible phase in mass of solute per unit volume of aqueous solution.

Chosen nodes are assigned first-type concentration values equal to diss_conc, which are maintained until all the material associated with a node is dissolved, at which time the node reverts back to an unconstrained condition. Once unconstrained, any water flowing in will generate mass due to the nonzero concentration, and so dissolution nodes should not be located on the outer surface of the domain.

It is assumed that the total mass of dissolvable material is located in the matrix only. The total mass available for dissolution associated with a given node is then calculated by multiplying contributing volume (from all shared elements) times the porosity times the variable diss_mass.
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