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Single Sided Ventilation Inside a Room Considering a Heater

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The problem simulates the airflow of air inside a room considering a heater and checking the heat transfer inside the room by single-sided ventilation.

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

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Project Description

The problem simulates the airflow inside a room considering a heater and analyses the heat transfer inside the room using single-sided ventilation. Inside the room, an aluminum radiator is used as a heat source with an output energy of 23469 W.m-3. Also, a window is placed on one of the lateral walls for the outlet airflow. The boundary condition of the pressure outlet with the pressure equal to the ambient pressure (atmospheric pressure) and the backflow air temperature equal to the room temperature is used. The purpose of this study is to investigate the airflow behavior in the room.

Geometry & Mesh

The 3-D geometry of the present model is designed using Design Modeler software. The model consists of a room measuring 2.15 m ⨯ 2.16 m ⨯ 3.32 m, with a rectangular cube heater at the bottom of one of its sidewalls. The following figure shows the geometry.

single sided

The meshing of the present model has been done by ANSYS Meshing software. The mesh type is unstructured and the element number is 987087. The following figure shows a view of the mesh.

single sided

Single-Sided Ventilation CFD Simulation

To simulate the present model, several assumptions are considered, which are:

  • The Pressure-Based solver has been performed.
  • Simulation has been performed in both fluid and heat transfer modes.
  • The present model is steady-state.
  • The effect of gravity is 9.81 m.s-2 on the fluid.

Here is the summary of the steps for defining a problem and its solution in the table:

Viscous modelk-epsilon
k-epsilon modelrealizable
near-wall treatmentstandard wall function
Boundary conditions 
OutletPressure outlet
gauge pressure0 Pascal
Wall motionstationary wall
heat flux0 W.m-2
Solution Methods (single-sided ventilation)
Pressure-velocity coupling SIMPLE
Spatial discretizationpressuresecond-order
momentumsecond-order upwind
densitysecond-order upwind
turbulent kinetic energysecond-order upwind
turbulent dissipation ratefirst-order upwind
energysecond-order upwind
Initialization(single-sided ventilation)
Initialization method Standard
gauge pressure101325 pascal
velocity (x,y,z)0 m.s-1
temperature300 K

Single-Sided VentilationResult

At the end of the solution process, two-dimensional and three-dimensional contours of pressure, temperature, and velocity, as well as two-dimensional and three-dimensional velocity vectors, are obtained. The two-dimensional contours and vectors are drawn in two sections, XY and YZ so that the contours on the YZ page are drawn in three different sections.


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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