Item description

Simulation of airflow around two burst fans using the MRF method

A mechanical fan is a machine used to generate flow inside a fluid that is usually a gas like air. This is achieved by turning a number of blades connected to a hub and shaft driven by a motor or turbine. The  fans flow rate are about 6 to 60,000 cubic meters per minute. Blower is another name for fans in which the flow resistance in the downstream fan is high.

In this analysis, it has been tried to simulate and analyze the airflow around two burst fans using the MRF method by Ansys Fluent software.

Geometry and Mesh

The geometry required for this analysis was generated by the Ansys Design Modeler software, the meshing required for this analysis was generated by Ansys Meshing software. The type of meshing used in this analysis is unstructured and the total number of cells produced for this geometry is 1914376 cells.


In this analysis, the viscosity model K-epsilon RNG has been used to check the fluid flow. Near the wall, the Standard Wall Function is used. To simulate the rotation of the fans, the MRF method, or the Frame Motion method, is used in the Cell Zone Condition section.

Boundary Condition

The airflow inlet is defined as the pressure inlet and its value is set to be equal to 0 pa. The outlet is defined as pressure outlet. The walls of the fan are also defined as the wall of the fan itself, and the velocity of the fans is 300rpm.

Discretization of equation

In this analysis, the SIMPLE algorithm is used to discretize the coupled velocity and pressure equations. The Momentum equation is also discretized into Second Order Upwind.

The results are presented as velocity contours as well as streamlines.

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