Fan Stage (Axial Flow) Aerodynamic Performance, ANSYS Fluent Training

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In this project, steady air flow in a 3D axial flow fan stage is simulated.

This product includes Mesh file and a Training Movie.

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Fan Stage Problem description

In this project, steady air flow in a 3D geometry of fan stage is simulated. Fan stage is a common apparatus used for creating steady air flow in industrial applications used in cooling process of new painted body parts. Periodic boundary condition is used for simulation of real fan stage at lowest computational cost. Two sections are involved, Rotor and Stator. Rotor, which has a built-in blade, rotates with constant angular velocity and leads air to enter stator region with high velocity. Blade with-in stator alters the flow direction to force it exit stator approximately normal to outlet surface. Rotor domain rotation is simulated using MRF module with angular velocity equal to 1800rpm. Stator domain is fixed.

Fan Stage Geometry and mesh

Geometry of fluid domain is designed in Design Modeler and computational grid is generated using ANSYS Meshing. Mesh type is unstructured and element number is 73000.

fan stagefan stage

Solver configuration

Critical assumptions:

  • The solver type is Pressure Based.
  • Time formulation is assumed Steady.
  • Gravity effects is neglected.

The following table a summary of the defining steps of the problem and its solution.

Viscous Turbulent model Standard K-epsilon

(standard wall function)

Fluid Definition method Fluent Database
Material name Air
Cell zone conditions
Mrf_rotor Rotational velocity 1800 rad/s
Boundary conditions
Mass flow inlet Type Pressure-inlet
Gauge pressure 0 Pa
Flow direction -Z
Solver configurations
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Green gauss cell-based
Pressure standard
Momentum Second order Upwind
Turbulent kinetic energy first order Upwind
Turbulent dissipation rate first order Upwind
Initialization Gauge pressure 0 Pa
X velocity 0 m/s
Y velocity 0 m/s
Z velocity -1 m/s
Turbulent kinetic energy 1 m2/s2
Turbulent dissipation rate 1 m2/s3

Results and discussion

Rotor’s angular velocity of 1800 rad/s results in linear velocity of max diameter of rotor to be equal to 31 m/s. TSR (Tip Speed Ratio) which is the ratio of angular velocity (=32m/s) to free stream flow velocity in stator (=8m/s) is equal to 4. Air flow rate at stator outlet is equal to 16.14 lit/s.

There is a mesh file in this product. By the way, the Training File presents how to solve the problem and extract all desired results.


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