Use the Flux node to select whether the boundary condition is imposed for electron density or electron energy or both. The wall boundary condition should be used in preference to the flux boundary conditions for walls. A user-defined electron Flux can be specified by the following:

Select the Use flux for electron density check box to activate the boundary condition for electron density. Then enter a value for the Electron density influx re(SI unit: 1/(m2·s)).

Select the Use flux for electron energy density to activate the boundary condition for electron energy. Then enter a value for the Electron energy density influx ren (dimensionless).