How to model a FAN inside Fluent?

Fluent has provided a built-in fan model, which enables users to model the fan motion without designing the fan blades in detail. The fan model is a lumped parameter model that can determine the impact of a fan with known characteristics upon some larger flow field. The fan boundary type lets you input an empirical fan curve that governs the relationship between the head (pressure rise) and flow rate (velocity) across a fan element. You can also specify radial and tangential components of the fan swirl velocity. The fan model does not accurately describe the detailed flow through the fan blades. Instead, it predicts the amount of flow through the fan. Fans may be used in conjunction with other flow sources or as the sole flow source in a simulation. In the latter case, the system flow rate is determined by the balance between losses in the system and the fan curve.

MR-CFD, an expert in the field of CFD simulations

With several years of experience simulating a wide range of problems in various CFD fields using Fluent software, the MR-CFD team is ready to offer extensive modeling, meshing, and simulation services. MR-CFD team is an expert in simulating projects in which axial fans are needed to be simulated. Using this feature, MR-CFD provides customers with a low-cost and straightforward model that can precisely emulate airflow circulation inside a space compared with reality. A fan is considered infinitely thin, and the discontinuous pressure rise across it is specified as a function of the velocity through the fan. The relationship may be a constant, a polynomial, piecewise-linear, or piecewise-polynomial function, or a user-defined function.

In the case of a polynomial, the relationship is of the form

where is the pressure jump,  Are the pressure-jump polynomial coefficients, and is the magnitude of the local fluid velocity normal to the fan. The velocity can be either positive or negative. You must be careful to model the fan so that a pressure rise occurs for forwarding flow through the fan. For three-dimensional problems, the values of the convected tangential and radial velocity fields can be imposed on the fan surface to generate a swirl. These velocities can be specified as functions of the radial distance from the fan center. The relationships may be constant or polynomial functions or user-defined functions. For the case of polynomial functions, the tangential and radial velocity components can be specified by the following equations:

where and are, respectively, the tangential and radial velocities on the fan surface in m/s,  and Are the tangential and radial velocity polynomial coefficients, and is the distance to the fan center.


Our services are not limited to the mentioned subjects. The MR-CFD team is ready to undertake different and challenging projects—in which Fan models must be implemented—ordered by our customers. You can consult with our experts freely and without charge at first, and then order your project by sending the problem details to us using the following address.

[email protected]

By entrusting your project to the MR-CFD team, you will not only receive the related project’s files (Geometry, Mesh, Fluent files). Also, you will be provided with an extensive tutorial video demonstrating how you can create the geometry, mesh, and define the needed settings in the Fluent software all by yourself. And these all come with post-technical support from the MR-CFD team.

MR-CFD experts are ready to fulfill every Computational Fluid Dynamic (CFD) needs. Our service includes industrial and academic purposes considering a wide range of CFD problems. MR-CFD serves in three main categories: ANSYS Fluent Consultation, ANSYS Fluent Training, and ANSYS Fluent Project Simulation. MR-CFD company has gathered experts from various engineering fields to ensure the quality of CFD services. Your CFD project would be done the shortest time, with the highest quality and reasonable cost.

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