The Source node describes generation within the domain of the dependent variable for the selected species. Specify the source contribution for each species in the corresponding field. You express addition or removal with a positive or negative value, respectively.

Enter a value or expression in the corresponding field for the source Si for species i. The SI unit depends on the selection done in Transported Quantity.

This setting is only available when the model includes deforming or rotating domains, for example when using a Moving Mesh node or a Structural Mechanics interface. From the Frame list, select Reference configuration or Deformed configuration to specify the source in the material frame or in the spatial frame. They are related by the volume ratio.

Physics tab with Transport in Solids selected: