The Mass Source node adds a mass source Qm, which appears on the right-hand side of the Darcy’s Law equation (Equation 7-1).

For the Fracture Flow interface, the mass source is applicable to the right-hand side of Equation 4-40 in the Subsurface Flow Module User’s Guide (where it is multiplied with the fracture thickness).

Enter a value or expression for the Mass source Qm (SI unit: kg/(m3·s)). The default is 0 kg/(m3·s).