Regions of fluid flow and/or heat transfer in CFX are called domains. Fluid domains define a region of fluid flow, while solid domains are regions occupied by conducting solids in which volumetric sources of energy can be specified. The domain requires three specifications:
The region defining the flow or conducting solid. A domain is formed from one or more 3D primitives that constrain the region occupied by the fluid and/or conducting solids. For details, see Mesh Topology in CFX-Pre in the CFX-Pre User's Guide.
The physical nature of the flow. This determines the modeling of specific features such as heat transfer or buoyancy.
The properties of the materials in the region.
There can be many domains per model, with each domain defined by separate 3D primitives. Multidomain problems may be created from a single mesh if it contains multiple 3D primitives or is from multiple meshes. For details, see Importing and Transforming Meshes in the CFX-Pre User's Guide.