The simulation of continua requires a bridge between what we understand in the material world and the mathematical constructs of transport equation models. In the physical world, we understand concepts such as "walls" or "porous media". In the modeling world, we think in terms of "boundary conditions" or "volumetric source terms". These concepts are bridged in STAR-CCM+ by formally defining types, conditions and values in such a way that there is no ambiguity. These three entities are used to provide to the continuum models complete information for dealing with boundaries, regions and interfaces.
Conditions and values are covered in detail in a separate section. This section includes information about: