Line Mass Source

This feature requires at least one of the following licenses: Battery Design Module, CFD Module, Chemical Reaction Engineering Module, Corrosion Module, Electrochemistry Module, Electrodeposition Module, Fuel Cell & Electrolyzer Module, Microfluidics Module, Pipe Flow Module, or Subsurface Flow Module.

The feature models mass flow originating from a tube region with infinitely small radius.

For the Reacting Flow in Porous Media, Diluted Species interface, which is available with the CFD Module, Chemical Reaction Engineering Module, or Battery Design Module, there are two nodes, one for the fluid flow () and one for the species ().

Selection

The feature is available for all dimensions, but the applicable selection differs between the dimensions.


Model Dimension	Applicable Geometrical Entity
2D	Points
2D Axisymmetry	Points not on the axis of symmetry
3D	Edges

Source Strength

The source ,

, should be specified. A positive value results in mass being ejected from the line into the computational domain and a negative value means that mass is removed from the computational domain.

Line sources located on a boundary affect the adjacent computational domains. This, for example, has the effect that a line source located on a symmetry plane has twice the given strength.


	Mass Sources for Fluid Flow in the COMSOL Multiphysics Reference Manual