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PumpLinx: Computational Fluid Dynamics (CFD) Design Tool for Predicting Flow and Cavitation in Pumps, including: Axial / Centrifugal / Crescent / Gear / Gerotor / Lobe / Piston / Ring / Side Channel / and Vane Pumps. SimericsMP: General Purpose Multi-Physics CFD for modeling Heat, Flow and Cavitation, including Blowers, Fans, Mixers, Propellers, and Valves.

External Gear Pump Design:

An external gear pump is a Positive Displacement Pump with 2 side-by-side interlocking gears sets. When the gears rotate, the diverging teeth create an expanding volume which draws in fluid. The fluid is then transported around the periphery and expelled as the teeth merge.


Positive displacement, High speed.


Transmissions, hydraulics, fluid transfer.

External Gear Pump Model

PumpLinx: Solve Flows, Pressures, Cavitation, and Loads:


  • Able to handle intermeshing gears
  • Models cavitation
  • Accurate tip leakage
  • Superior treatment of rotating-stationary interfaces
  • Ease-of-use
  • Fast turn-around

Design Issues/Benefits:

  • Gear Design
  • Port design
  • Leakage reduction
  • Reduce Cavitation effects on efficiency and pump life
  • Reduce Pressure ripple and noise


EXAMPLE: Demonstration External Gear Pump
Demonstration of PumpLinx capability to model external gear geometries.
Gear Pump Pressure
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