Homogeneous Additional Variables are assumed to have the same values for all phases, that is,

(5–220)

and are described by the following bulk transport equation:

(5–221)

where:

(5–222)

Homogeneous diffusive transport equations exclude the advection term from Equation 5–221, while homogeneous Poisson equations exclude the advection and transient terms.

Homogeneous Additional Variables are available for both homogeneous and inhomogeneous flow. However, in most cases, the homogeneous assumption is inappropriate for volumetric Additional Variables. For this reason, only specific Additional Variables are permitted to be homogeneous in Ansys CFX.