Series Fans CFD Simulation using MRF Method
In this project, steady air flow is investigated in between two 3-bladed series fans which are rotating at angular velocity of 300 rpm.
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Series Fans Problem description
In this project, steady air flow is investigated in between two 3-bladed series fans which are rotating at angular velocity of 300 rpm. Rotation of fans generates air suction at inlet boundary with flow rate equal to 2.95755 m3/s. Velocity of air reaches values up to 25 m/s on domain centerline however maximum air velocity in the domain is equal to 47.05 m/s which is captured downstream of the first fan.
Geometry and mesh
Geometry of fluid domain is designed in Design Modeler and computational grid is generated using ANSYS Meshing. Mesh type is unstructured and element number is 1914000.
Solver configuration for Series Fans CFD Simulation
- Solver type is assumed Pressure Based.
- Time formulation is assumed Steady.
- Gravity effects is neglected.
The following table a summary of the defining steps of the problem and its solution.
|Near wall treatment||Enhanced wall treatment|
|Fluid||Definition method||Fluent Database|
|Cell zone conditions|
|Fans||Frame motion||Rotational speed (300rpm)|
|Gauge pressure||0 Pa|
|Gauge pressure||0 Pa|
|Spatial discretization||Gradient||Least square cell-based|
|Momentum||Second order Upwind|
|K||First order Upwind|
|Epsilon||First order Upwind|
Results and discussion
Air mass flow rate at inlet is equal to 3.62019 kg/s.
Comparison between pressure drops of first and second fan shows that pressure drop in first fan has higher value which is 2 times more than second fan. Pressure drop in first and second fan is equal to 500 and 230 Pa respectively. Negative gauge pressure is observed downstream both fans where the pressure at downstream of first fan is five times less than second fan. Gauge pressure at downstream of first and second fan is equal to -500 and -100 Pa.
as a result of pressure drops in both fans, pressure drop in first fan being higher, velocity magnitude at downstream of first fan has a higher value (28m/s) compared to second fan (12m/s).
There is a mesh file in this product. By the way, the Training File presents how to solve the problem and extract all desired results.