Air Conditioning of a Room with a Heat Source CFD Simulation, ANSYS Fluent

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The present problem simulates the air conditioning of a room with a cylinder as a heat source.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Project Description

The present problem simulates the air flow inside a room and the process of air conditioning. There are three sections for the entry of fresh air on the roof of the room; So that the air flow enters the interior of the room with a speed equal to 0.4 m.s-1 and at a temperature equal to 295 K. On the side walls of the room, there are two sections for air flow outlet, which have a pressure equivalent to atmospheric pressure. The side walls and ceiling of the room also have a thermal insulation boundary condition. There is a cylindrical heat source made of aluminum inside the room; So that this heat source has a constant temperature equal to 353 K.

Geometry & Mesh

The current model is designed in three dimensions using Design Modeler software. The model consists of a room in the shape of a rectangular cube that has three square sections for air inlet on its roof and two rectangular sections for air outlet in its side walls. The length and width of the room are 10 m and 3 m, respectively, and its height is equal to 2.7 m. A cylindrical heat source is also used inside the room.

air conditioning

The meshing of the present model has been done using ANSYS Meshing software. The mesh type is unstructured and the element number is equal to 98924.

air conditioning

Air Conditioning CFD Simulation

To simulate the present model, several assumptions are considered:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is ignored.

A summary of the defining steps of the problem and its solution is given in the following table:

Models (air conditioning)
Viscous k-epsilon
k-epsilon model standard
near-wall treatment standard wall function
Energy On
Boundary conditions (air conditioning)
Inlet 1 Velocity Inlet
velocity magnitude 0.4 m.s-1
temperature 295 K
Outlet Pressure Outlet
gauge pressure 0 pascal
Outer walls of room Wall
wall motion stationary wall
heat flux 0 W.m-2
Internal walls for heat source Wall
wall motion stationary wall
thermal condition coupled
Methods (air conditioning)
Pressure-Velocity Coupling SIMPLE
Pressure second order
momentum second order upwind
energy second order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
Initialization methods Hybrid

Air Conditioning Results

At the end of the solution process, two-dimensional and three-dimensional contours related to pressure, velocity, and temperature are obtained. Also velocity vectors are obtained in two-dimensional and three-dimensional mode.

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.


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