FEM Analysis

Analysis

• Created an Enclosure for the Rotating Domain and Room according to standards

• Meshing the Entire setup

•        Mesh size for fan: 10 mm

•        Mesh size for room and rotating domain: 300 mm

• Rotating speed for the fan: 300 RPM

• Step size: 1000

• Step time: 0.01 s

Standards Considered

Arshea Standards

Sweep Domain: Cylindrical (fluid)

Room size

length: 4.5 m

height: 3 m

width: 4.5 m

Computation in ANSYS Fluent 2025 R2 was done to evaluate aerodynamic and acoustic performance. To resemble real-life working conditions, a rotating enclosure which represented the fan and a room domain (4.5 m × 3 m × 4.5 m) were designed. Figure 8 depicts the cuboidal enclosure done using the standards that represents a room. A Cylindrical enclosure was created around the fan to represent the sweep or the rotating domain represented in Figure 19.

A fine 10 mm resolution was used in the fan blades and a course 300 mm in the room domain in the mesh, to capture a highly detailed resolution of the flow at the blade surface. Figure 20 and Figure 21 show the meshing done to the fan and the sectional view of the meshing of the environment.

The fan was modeled at 300 RPM rotation with time step of 0.01 and 1000 steps and transient effects were recorded which is useful in the prediction of noise. ARSHEA standards of indoor airflow and acoustics had been adhered to by the boundary conditions.
The fields of velocity, distributions of pressure, the rate of airflow velocity and the level of noise in decibel (dB) were all data mined out of these simulations.

Air delivery was calculated using the formula :

Air Delivery = Average Velocity × Effective sweep Area × 60 -(1)

The potential of noise reduction was quantitatively compared to airflow efficiency trade-offs by comparing the performance of each biomimetic design.

In the quest to make the manufacturing concept practically viable, the manufacturing factors of the cost, material minimization and complexity were incorporated with the results of the performance process so that a complete evaluation of the balance between the acoustic comfort, aerodynamic performance, and economic feasibility could be achieved.

This is a multi-disciplinary approach that integrates biomimicry, CAD modeling, CFD, and acoustics to give comprehensive information on optimizing the design of fan blades to the solution of the next generation thermal comfort with less noise and enhanced airflow.