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Series Fans CFD Simulation using MRF Method

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$28.00

In this project, steady air flow is investigated in between two 3-bladed series fans which are rotating at angular velocity of 300 rpm.

This product includes Mesh file and a Training Movie.

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Description

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.

series fans

series fansseries fans

Solver configuration for Series Fans CFD Simulation

Critical assumptions:

  • 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.

Models
Viscous K-epsilon model RNG
Near wall treatment Enhanced wall treatment
Materials
Fluid Definition method Fluent Database
Material name air
Cell zone conditions
Fans Frame motion Rotational speed (300rpm)
Boundary conditions
Inlet Type pressure inlet
Gauge pressure 0 Pa
Outlet Type pressure outlet
Gauge pressure 0 Pa
Solver configurations
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Least square cell-based
Pressure Standard
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.

series fans

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.

series fans

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.

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