Heat Sink Cooling with a Porous Medium, ANSYS Fluent CFD Training

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In this project, the fluid flow inside a porous medium is simulated for a heat sink cooling.

This product includes Geometry & Mesh file and a comprehensive Training Movie.

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Porous Medium Introduction

Studying fluid flow in porous media is one of the most widely used fields of science. A porous medium is made up of mostly perforated materials and contains pores and void spaces within itself. Various body tissues such as skin, bones, kidneys, and lungs can be considered as a porous medium. Porous media are widely used in a variety of industries such as food, oil, textiles, building materials, insulation, filters, and membranes.

Heat Sink Cooling Project description

In this project, the fluid flow and heat transfer inside a porous medium is simulated by ANSYS Fluent software. This porous medium is in contact with a heat source and the whole setup acts as a heat sink. The energy model is activated and the RNG  k-epsilon model with the use of standard wall function is exploited for fluid flow analysis.

Geometry and mesh

The modeled geometry for this simulation consists of a hollow section acting as an inlet, followed by a porous aluminum foam, which is in contact with a heat source. Geometry is designed in ANSYS design modeler® and is meshed in ANSYS meshing®. The meshes used for this geometry are structured and the total number of mesh cells is 7680.

The following figure shows the geometry of the porous aluminum heat sink

heat sink

The following figure shows the mesh of the modeled porous aluminum heat sink


Heat Sink Cooling CFD Simulation

The assumptions considered in this project are:

  • Simulation is done using a pressure-based solver.
  • The present simulation and its results are steady and do not change as a function time.
  • Simulation is done using axisymmetric assumptions.
  • The effect of gravity has not been taken into account.

The applied settings are recapitulated in the following table.

(porous) Models
Viscous model k-epsilon
k-epsilon model RNG
near-wall treatment standard wall function
Energy on
(porous) Cell zone conditions
Fluid zone
Foam zone Porous zone  
Fluid porosity 0.87
Viscous resistance 45774563.33 (both direction)
(porous) Boundary conditions
Inlet velocity inlet
velocity 1.99 m/s
Turbulent intensity 5 %
Hydraulic diameter 0.065 m
Temperature 300 K
Outlet outflow
Aluminum rod and heat source Heat flux 20000 W/m2
Outer walls Heat flux 0 W/m2
(porous) Solution Methods
Pressure-velocity coupling   SIMPLE
Spatial discretization pressure standard
momentum first-order upwind
energy second-order upwind
turbulent kinetic energy first-order upwind
turbulent dissipation rate first-order upwind
(porous) Initialization
Initialization method   Hybrid


We obtain the contours of temperature, velocity, pressure, streamlines, and velocity vectors.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.


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