Impeller of an Electrical Motor, Airflow Analysis, ANSYS Fluent Simulation Training

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In this project, the airflow passing over an impeller of an electrical motor is investigated.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Turbomachines, also known as fluid machines, are widely used in the industry. Therefore, it is imperative to study their behavior in the fluid environment around them. Turbomachines are divided into two general categories. The first group works by taking energy and transferring it to the fluid, and the second group works and takes energy from the fluid, transferring it to the system in various forms. The first group’s examples are fans and compressors, and wind and water turbines can be mentioned as the second category. Electric motors impeller are also a type of turbomachine that falls into the first category.

Investigating the movement of such motors’ blades in the fluid flow surrounding them can help a lot in analyzing their behavior and can ultimately improve the design and selection of the material used in such blades.

Project description

In this project, the airflow passing over an impeller is investigated. The airflow enters the computational domain with 80m/s, and the impeller rotates with 1000rpm. A Realizable k-epsilon model is exploited to solve turbulent flow equations. It should be noted that the MRF option has been activated to model the rotation of the impeller.

Impeller Geometry & Mesh

The geometry of this project is designed in ANSYS design modeler and meshed in ANSYS meshing. The mesh type used for this geometry is unstructured and the element number is 1786708.

impeller impeller

Impeller CFD Simulation Settings

The critical assumptions considered in this project are:

  • Simulation is done using a pressure-based solver.
  • The present simulation and its results are considered steady and do not change as a function of time.
  • The effect of gravity has not been taken into account.

The applied settings are summarized in the following table.

Viscous model k-epsilon
k-epsilon model realizable
near-wall treatment standard wall function
Cell zone conditions
Part-MRF Rotational velocity 1000 rpm
Boundary conditions
Inlet Velocity inlet
Inlet 80 m/s
Outlet Pressure outlet
Gauge pressure 0 Pa
Walls Stationary wall
Solution Methods
Pressure-velocity coupling   SIMPLE
Spatial discretization Pressure Second-order
Momentum second-order upwind
turbulent kinetic energy first-order upwind
turbulent dissipation rate first-order upwind
Initialization method   Standard
gauge pressure 0 Pa
Velocity (x,y,z) (-80,0,0) m/s
Turbulent kinetic energy 0.96 m2/s2
Turbulent dissipation rate 1135.648 m2/s3


We present the contours of pressure, velocity, temperature, etc.

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, the Training File presents how to solve the problem and extract all desired results.


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