The Vacuum Pump node models the effective outlet pressure created by a vacuum pump device that is attached to the outlet.

The Static pressure curve option defines a lumped curve — Linear, Static pressure curve data, or User defined.

For the Linear option, values or expressions should be specified for the Static pressure at no flow pnf and the Free delivery flow rate V0,fd.

The static pressure curve value is equal to the static pressure at no flow rate when V0 < 0 and equal to 0 when the flow rate is larger than the free delivery flow rate.

The Static pressure curve data option can be used to enter or load data under the Static Pressure Curve Data section below. The interpolation between points given in the Static Pressure Curve Data table is defined using the Interpolation function type list in the Static Pressure Curve Interpolation section.

The User defined option can be used to enter a different value or expression. The flow rate across the selection where this boundary condition is applied is defined by phys_id.V0 where phys_id is the name (for example, phys_id is spf by default for this physics interface). In order to avoid unexpected behavior, the function used for the fan curve is the maximum of the user-defined function and 0.

This section displays when Static pressure curve data is selected as the Static pressure curve. In the table, values or expressions for the Flow rate and Static pressure curve should be specified. Alternatively, a text file can be imported by clicking the Load from file button () under the table.

This section is available when Static pressure curve data is selected as the Static pressure curve. Units can be specified here for the Flow rate and Static pressure curve.

This section is available when Static pressure curve data is selected as the Static pressure curve. The available options for the Interpolation function type are Linear, Piecewise cubic, and Cubic spline.