FLAIR Tutorial 7: A computer room

This tutorial involves a computer room with an array of computers sitting on desks. A door is open and air is injected through a diffuser on the far right side of the ceiling as shown in the following picture. The case shows how to use 'Group' and 'Arraying objects' features to add the desks and computers. A round diffuser is loaded from the predefined HVAC object library.

 

Setting up the model

Start FLAIR with the default room

The FLAIR VR-Environment screen should appear, which shows the default room with the dimensions 10mx10mx3m.

Resizing the room

Adding objects to the room

a. add a door

X:1.0 m

Y:0.0 m

Z:2.0 m

X: 9.0 m

Y: 0.0 m

Z: 0.0 m

b. add the diffuser

X: 4.5 m

Y: 14.0 m

Z: 2.9 m

X:1.0 m

Y:1.0 m

Z:0.1 m

X: 4.5 m

Y: 14.0 m

Z: 2.9 m

c. add the array of desks and computers

X: 2.0 m

Y: 1.2 m

Z: 1.2 m

X: 2.0 m

Y: 2.0 m

Z: 0.0 m

X:0.8 m

Y:0.8 m

Z:0.8 m

X: 2.6 m

Y: 2.0 m

Z: 1.2 m

To activate the physical models

a. The Main Menu panel

FLAIR always solves pressure and velocities. The temperature is also solved as the default setting.

The 'Models' page of the Main Menu.

b. To activate K-E turbulence model

c. To set the grid numbers and to solver parameters

in X-direction to 33 cells

in Y-direction to 46 cells

in Z-direction to 16 cells

Variable TEM1

FIINIT Value 20

Running the Solver

To run the PHOENICS solver, Earth, click on 'Run', then 'Solver', then click on 'OK' to confirm running Earth. These actions should result in the PHOENICS Earth monitoring screen.

As the Earth solver starts and the flow calculations commence, two graphs should appear on the screen. The left-hand graph shows the variation of solved variables at the monitoring point that was set during the model definition. The right-hand graph shows the variation of errors as the solution progresses.

To the end of the calculation, the monitoring display would be as shown below.

Viewing the results

Saving the case

Once a case has been completed, it can be saved to disk as a new Q1 file by 'File - Save working files'. The Q1 and associated output files can be saved more permanently by 'File - Save as a case'.