Ansys Fluent - Axial Fan
Written by cfd.ninja
An axial fan moves air along its axis of rotation, with the flow entering and leaving parallel to the shaft. What you normally want from a CFD model is the pressure rise it delivers at a given flow rate, the torque on the shaft, and where the flow separates on the blades.
The rotation is handled with a Moving Reference Frame. Rather than physically spinning the mesh, the cell zone around the blades is solved in a rotating frame, which adds the centrifugal and Coriolis terms and keeps the run steady. That costs far less than a sliding mesh and works well when the interaction between rotor and casing is weak.
On the mesh side the blades need inflation layers, or neither the torque nor the separation will be trustworthy. Set the first layer height from the y+ your turbulence model expects, which you can estimate with the Y+ calculator.
In this tutorial you will learn to simulate an Axial Fan using Ansys Fluent. You can download the mesh from this link.
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