In a multiphase simulation, source terms that apply to all fluid in the simulation are set on the Sources tab. Bulk sources take account of the volume fraction of each phase when applying the source term. For details, see Bulk Sources in the CFX-Solver Modeling Guide.
Select the Bulk Sources check box to specify bulk sources.
Sources are set in the same way as for single phase simulations. For details, see Single-Phase Fluid Sources.