Blower Interface Properties

The properties of a Blower Interface node are listed below. These properties cannot be modified.


Boundary-0	Specifies the upstream boundary of the blower interface (Read Only)
Boundary-1	Specifies the downstream boundary of the blower interface (Read Only)
Type	Specifies the type of interface: Blower Interface.
Topology	Defines the connection type between the interfaces. Only the Indirect type is possible.
Connectivity Option	Shows how the boundaries on two sides of the interface are connected. Only Connect Average connectivity is possible.

Blower Interface Conditions

You can specify the following physics conditions for a Blower interface:


Blower Type	Specifies the blower type according to the fan geometry.
	Centrifugal	You set the fan curve type and specify the fan performance curve.
	Impeller	You set the fan curve type and specify the fan performance curve, and can optionally specify the fan swirl.
Fan Curve Type	The fan performance curve specifies the pressure rise across the blower interface.
	Polynomial	The fan curve is defined as a polynomial function.
	Table	The fan curve is defined as a table of pressure versus flow rate values.
Fan Swirl Option	The option to add swirl to the flow is available only for blowers of the Impeller type.
	Calculated	The Fan Swirl node is added to the Physics Values, where you specify the appropriate coordinate system and blade angle. The swirl is calculated accordingly and added to the flow.
	No Swirl	No swirl is added to the flow.

You can specify the following physics values for a Blower interface:


Blower Heat Generation Rate	Specifies the heat that is generated by the blower per unit time. This heat is added to the flow that exits the blower. This option is available only when an energy model is activated in the physics continuum.
Fan Curve Table/Polynomial	Specifies the fan curve performance using a table or a polynomial, according to the Fan Curve Type that is specified in the physics conditions. See Specifying the Fan Performance Curve as a Polynomial Function. See Specifying the Fan Performance Curve as a Table.
Fan Curve Temperature Scaling	Scale the fan performance curve using data temperature. This option is available only when an energy model is activated in the physics continuum. See Specifying the Fan Curve Temperature Scaling.
Fan Swirl	Specifies the coordinate system and the blade angle that are used to compute the flow swirl for the impeller fan. See Blower Swirl Values.
Fan Verbosity	Activate or deactivate the reporting of fan operating point details in the Output window. See Setting the Fan Interface Verbosity.
Pressure Jump Under-Relaxation Factor	Specifies an under-relaxation factor between 0 and 1 to improve convergence. See Pressure Jump Under-Relaxation Factor.

You can specify the following values:


Coordinate System	The coordinate system that is used to specify the impeller orientation and its rotation direction. Types other than Laboratory are not available for selection until you create them. You can use any of the coordinate system types for impeller fan modeling, but the following restrictions apply: The origin of the coordinate axes must coincide with the center of rotation of the impeller fan. The z-axis must run along the axis of the impeller fan and be directed such that the angular velocity of the fan is along the axis.
Blade Angle	The blade angle ( $β$ ) of the impeller fan: $β$ = 90 means radial blade. $β$ > 90 means forward-swept blade. $β$ < 90 means backward-swept blade.