This tutorial is similar to tutorial 2, but with an added person sitting on a chair as shown in the following figure. The case is to show how to activate the comfort index calculation.
Setting up the model
Follow the step-by-step instructions for Tutorial 2 in section 6.2.1, from 1. Start FLAIR with the default room to 3. Adding objects to the room; j. add the adiabatic walls at the x plane (west). Then we add a sitting person and a chair as follows.
The same as for tutorial 2
The same as for tutorial 2
a. b. c. d. e. f. g. h. i. j sections are the same as for tutorial 2
k. add a chair
X: 0.46 m
Y: 0.39 m
Z: 1.0 m
X: 0.75 m
Y: 0.6 m
Z: 0.0 m
to rotate the
CHAIR object until the seat faces the positive y direction.l. add a sitting person
The PERSON object is used to set the heat source. Its material is the domain material (air in this case).
X: 0.88 m
Y: 0.74 m
Z: 0.0 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 LVEL turbulence model
c. To activate IMMERSOL radiation model
d. To activate Comfort indices
To set the grid numbers and to solver parameters
on the hand-set or toolbar, then click on the image to bring up
the Grid mesh Settings dialog. The default grid will have 64, 48 and 64 cells in X, Y and Z.The final grid should look like this
Variable W1
FIINIT Value 0.01
The above initial settings are used to secure the convergence.
Variables T3 TEM1
Minimum value 15 15
The above settings are used to secure the convergence.
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
followed by the
'Vector toggle' 
. You will see the velocity vector displaying on X plane. Move the X-position
to 0.1m near the radiators, and use "Vector option" in the "Settings"
menu to change the scale factor to 0.02. You will see the following picture on the screen.
Velocity vectors at X= 0.1m plane
to clear the velocity vectors
to display the iso-surface contours as shown in the figure below.
The Iso-surface value has been set to 24, and the secondary variable for colouring the iso-surface has been set to T3, the radiant temperature.
The value of predicted PMV is between +1(slightly warm) and -1(slightly cool).
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'.
