All regions in a STAR-CCM+ simulation require an interface to be present between them that will transfer the appropriate mass and energy quantities during the calculation. In this example, we need to create two interfaces between the Fluid and Rotating regions. This involves creating so-called "In-place" interfaces between the default wall boundaries enclosing each region. The first interface will be created between the inlet and rotating section.
These two boundaries represent the interface between the fan's inlet section and the rotating region and will now be highlighted in pink in the Geometry Scene display.
The above step will create a new node within each Boundaries node called Interface1 [In-place 1].
In addition to the in-place boundaries, a new node called Interfaces will appear in the simulation tree. Within it, a new interface node called In-place 1 will be created. This will form the connection between the Fluid and Rotating regions once the flow initialization step has been performed and will supersede the original wall boundaries forming the connection.
The second interface will be created between the fan body and the rotating region.
These two boundaries represent the interface between the rotating region and the rest of the fan's stationary part and will now be highlighted in pink in the Geometry Scene display.
