External Gear Pump CFD Simulation, Dynamic Mesh

$240.00 Student Discount

  • The problem numerically simulates the External Gear Pump using ANSYS Fluent software.
  • We design the 2-D model with the Design Modeler software.
  • We mesh the model with ANSYS Meshing software, and the element number equals 9,254.
  • We perform this simulation as unsteady (Transient).
  • We use the Dynamic Mesh Model to define deforming and moving zones.
  • We use the user-defined function (UDF) to define the rotational motion of gears.

Special Offers For Single Product

If you need the Geometry designing and Mesh generation training video for one product, you can choose this option.
If you need expert consultation through the training video, this option gives you 1-hour technical support.
The journal file in ANSYS Fluent is used to record and automate simulations for repeatability and batch processing.
editable geometry and mesh allows users to create and modify geometry and mesh to define the computational domain for simulations.
The case and data files in ANSYS Fluent store the simulation setup and results, respectively, for analysis and post-processing.
Geometry, Mesh, and CFD Simulation methodologygy explanation, result analysis and conclusion
The MR CFD certification can be a valuable addition to a student resume, and passing the interactive test can demonstrate a strong understanding of CFD simulation principles and techniques related to this product.



This project is related to the External Gear Pump numerical simulation using ANSYS Fluent software. A pump is a mechanical device for moving and transferring all liquids from one place to another. In this way, by increasing the pressure, pumps cause liquids to move to a higher height (by increasing the head) and even lower (such as tanks).

This product is the fifth chapter of the Dynamic Mesh Training Course.

In fact, the pump takes mechanical energy from an external source, such as a motor, and transfers it to the fluid passing through it. As a result, the energy of the fluid increases after leaving the pump.

The energy transfer to the pump fluid is done in two dynamic and displacement methods. Therefore, pumps are divided into two categories: positive displacement pumps and dynamic or non-positive displacement pumps. Positive displacement pumps are divided into two groups: rotary (such as gear, lobe, and vane) and reciprocating (piston and diaphragm).

A gear pump is one of the most common pumps to increase the hydraulic power of a fluid. Gear pumps move liquids using gears. These gear pumps are made of two types of internal and external gears.

External gear pumps consist of two gears that rotate in opposite directions. When two gears make contact with their teeth, fluid is trapped. Now, when the teeth are separated from each other due to rotation, high-pressure fluid is rotated through the ribs to the outlet.

In this project, we simulated the water flow inside an external gear pump.

We aim to model the rotation of two gears inside the pump. The gears’ rotation changes the fluid’s behavior in the pump momentarily. So, the mesh of the computing domain deforms over time.

We modeled the geometry of the project using Design Modeler software. The geometry is related to an external gear pump. The computational domain includes the internal space of the pump with two superimposed gears. Then we meshed the model with ANSYS Meshing software. The model mesh is unstructured, and the number of cells equals 9,254.

External Gear Pump Methodology

The Dynamic Mesh Model is used in this simulation. We generally use a dynamic mesh whenever we have a moving boundary or a deforming zone.

Here, two gears are rotating in opposite directions. So this causes the mesh to deform over time. Therefore, we define a Rigid Body to define the rotational motion of the gears. We use a user-defined function (UDF) to define the motion of the rigid body.

According to the rotational motion of the gears as a rigid body, the mesh zone around the gears is deformed. So, for this zone, we use the Deforming option.

Due to the nature of this modeling, fluid behavior is time-dependent. Hence, we use the unsteady (Transient) solver.


After the solution, we obtained pressure and velocity contours. Because the gears rotate over time, we obtained the animation of the velocity and pressure contours.

The results show that this gear pump is working correctly. This pump can transfer the fluid well and increase the fluid’s pressure. The fluid is trapped in the space between the gears in contact. Then this fluid is pushed towards the outlet with high pressure.

external gear pump

external gear pump


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