Single Sided Ventilation in Room Considering a Heater, ANSYS Fluent Training

Description

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 by ANSYS Fluent software. 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.

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 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:

Models
Viscous model		k-epsilon
	k-epsilon model	realizable
	near-wall treatment	standard wall function
Boundary conditions
Outlet		Pressure outlet
	gauge pressure	0 Pascal
Walls		Wall
	Wall motion	stationary wall
	heat flux	0 W.m-2
Solution Methods (single-sided ventilation)
Pressure-velocity coupling		SIMPLE
Spatial discretization	pressure	second-order
	momentum	second-order upwind
	density	second-order upwind
	turbulent kinetic energy	second-order upwind
	turbulent dissipation rate	first-order upwind
	energy	second-order upwind
	Initialization	(single-sided ventilation)
Initialization method		Standard
	gauge pressure	101325 pascal
	velocity (x,y,z)	0 m.s-1
	temperature	300 K

Single-Sided Result

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.