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6.7.1 Geometry and Domain

The simulation of the swash plate piston pump requires understanding of the geometry and the fluid domain enclosed by the surfaces of the pump. The general fluid volume of the swash plate piston pump and prerequisite steps, before taking intoSimerics-MP+ is described as follows.

Prerequisite steps

• The fluid volumes for the swash plate piston pump consist of inlet, outlet ports, valve plate and reference piston assembly.

• For pumping chamber, the template requires reference piston assembly surfaces to be imported. The fluid volume of reference piston assembly should be extracted at neutral position of swash plate (zero degrees).

• The template creates the leakage gaps based on the values provided. Hence, the fluid volumes should be imported without clearances.

Figure 6.401 - Swash plate piston pump surfaces

Fluid Domain

The fluid volume in a swash plate pump is defined byCAD Surfaceswhich enclose them. The swash plate model primarily consists of the following volumes : Inlet, Outlet, Valve plate and Piston cylinder, as shown in Figure 6.402.

Inlet: The fluid enters the pump through the Inlet boundary. Pressure is generally specified as a boundary condition at the inlet, while the other surfaces of the inlet volume are treated as walls.

Valve Plate: The fluid volume enclosed between inlet/outlet ports and cylinder.

Piston Cylinder: This is the pumping chamber, where fluid gets sucked and compressed.

Outlet: The fluid exits the pump at the outlet boundary. Pressure is generally specified as a boundary condition at the outlet, while the other surfaces of the outlet volume are treated as walls.

For an example of the swash plate piston pump simulation, refer Swash Plate Piston Tutorial.