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Centrifugal Blower CFD Simulation by ANSYS Fluent

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The present problem simulates a centrifugal blower using ANSYS Fluent software.

This product includes a Mesh file and a comprehensive Training Movie.

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Description

Project Description

The present problem simulates a centrifugal blower using ANSYS Fluent software. The blower is a particular device for blowing high-pressure air, which generally has applications such as dust cleaning and … . For example, a blower is used to clean computer parts and equipment. The central motor of this device, with its rotational motion, creates a lot of pressure in the air and directs this high-pressure air out of the outlet part of the device. The blower designed in this modeling is centrifugal. The centrifugal blower can absorb air from its central part, and then this airflow enters the central impellers, which is in the form of a fin disc. The rotational motion of the blades at high speed causes the airflow to rotate.

The centrifugal force increases the air pressure and, consequently, the airflow’s velocity. Finally, this high-pressure air is directed to the outside environment through a duct installed on the blower’s outer body. To define the rotational flow of air in the simulation, an area around the blades is distinguished from the entire computational domain; So for this area, the frame motion technique has been used. In fact, by doing so, it is assumed that instead of defining rotational motion for the blades at a given speed, rotational flow is defined for the air around the blades at the same speed. This rotational motion has a rotational speed of 260 rad.s-1.

Also, since the model’s prominent nature is related to pressure changes, the pressure boundary condition is used at the input (central part of the model) and the output (outer part of the model).

Centrifugal Blower Geometry & Mesh

The present model is designed in two dimensions using Design Modeler software. The model is a two-dimensional centrifugal blower designed to reduce computational costs. Since the blower is centrifugal, the current input is from the center of the model, and its output is located in the model perimeter.

centrifugal blower

We carry out the model’s meshing using ANSYS Meshing software, and the mesh type is unstructured. The element number is 172824. The following figure shows the mesh.

centrifugal blower

Centrifugal Blower CFD Simulation

We consider several assumptions to simulate the present model:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • We ignore the gravity effect.

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

Models
Viscous k-epsilon
k-epsilon model standard
near wall treatment standard wall functions
Boundary conditions
Inlet Pressure Inlet
gauge total pressure 0 pascal
Outlet Pressure Outlet
gauge pressure 0 pascal
Vanes Wall
wall motion moving wall
rotational speed 0 rad.s-1
Walls Wall
wall motion stationary wall
Methods
Pressure-Velocity Coupling SIMPLE
Pressure second order
momentum second order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
Initialization
Initialization methods Hybrid

Results & Discussion

At the end of the solution process, two-dimensional contours related to turbulence pressure, velocity, and kinetic energy are obtained. Also, two-dimensional path lines and two-dimensional velocity vectors are obtained. The images show that the airflow enters from the blower’s central part and experiences high-pressure rotational motion in the areas adjacent to the blades. Then the pressure and speed of the airflow increases and is directed outwards from the blower outlet.

There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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