Point Mass Source
This feature is only available in a limited set of add-on products. See http://www.comsol.com/products/specifications/ for more details on availability.
The Point Mass Source feature models mass flow originating from an infinitely small domain around a point.
For the “Reacting Flow in Porous Media, Diluted Species” interface, which is available in some add-on products, the Point Mass Source node is available in two versions, one for the fluid flow (Fluid Point Source) and one for the species (Species Point Source).
Species Source
Enter the source strength, , for each species (SI unit: mol/s). A positive value results in species injection from the point into the computational domain, and a negative value means that the species is removed from the computational domain.
Point sources located on a boundary or on an edge affect the adjacent computational domains. This has the effect, for example, that the physical strength of a point source located in a symmetry plane is twice the given strength.