Encyclopaedia Index

For this workshop you can load and modify case 274 from the core library. The basic case models the isothermal flow of air past a moving van. the movement of the van is represented by giving the floor plane the same velocity as the air inlet.

Conjugate heat Transfer

Conjugate heat transfer is active within the solids of the domain provided solid numbers 198 and 199 are not selected, and temperature is solved.

The workshop takes the basic case, activates solution of temperature, and sets appropriate physical properties for the blocks representing the van body.

Accessing PHOENICS-VR

From the system level:

To enter the PHOENICS-VR environment, click on the PHOENICS icon on the desktop, or click on Start, programs, PHOENICS, PHOENICS.

In PHOENICS-VR environment,

Click on 'File', 'Load from Libraries', enter 274 in the Case Number data entry box, and click 'OK'.

In the VR-Editor

Turn Solution of the Energy Equation ON

Click on 'Main menu', 'Models', and 'Energy Equation'. Select 'Temperature'.

Click on 'Properties', switch 'Use property tables' ON. Set the domain material to 'Gases', '0 Air at 20 deg C'.

Set the Reference pressure to 1E5 Pa. Change the 'temperature units' from 'Kelvin' to 'Centigrade'. From now on, all temperatures will be in degrees C. Set the Ambient temperature to 20, and leave the ambient pressure at 0 (relative to the Reference pressure). Turn 'initialise from ambient' ON.

Click 'Top Menu' then 'OK' to leave the main menu.

Set Physical Properties for Blockages

Click on 'Obj' button on the main control panel to bring up the Object management dialog box.

Select BODY1 in the list, then with the 'shift' key held down select RWHL. This will select all the blockages. Right-click, and select 'Open object dialog.

Click on 'Attributes', 'Types', 'Solids', 'OK', select any solid, say Aluminium, and click 'OK' three times. Click YES to propagate the change to all selected blockages.

Set Thermal Boundary Conditions

Double-click on the UPSTR object, click on 'Attributes'. The inlet temperature is Ambient, 20° C.

Double-click on the FWHL object, then on 'Attributes'. Click on 'Adiabatic', and select Fixed Heat Flux from the list of heat sources. Set the heat source to: 3000W. Leave the other objects and the ROAD as adiabatic.

In the PHOENICS-VR environment, click on 'Run', 'Solver'(Earth), and click on 'OK'; to confirm running Earth.

Using the VR Viewer.

In the PHOENICS-VR environment, click on 'Run', 'Post processor', then GUI Post processor (VR Viewer) . Click 'OK' on the file names dialog to accept the default files.

To view:

• Vectors - click on the 'Vector toggle'
• Contours - click on the 'Contour toggle'
• Streamlines - click on the 'Create Streamline' button
• Iso-surfaces - click on the 'Iso-Surface toggle'

To select the plotting variable:

• To select Pressure - click on the 'Select Pressure button' .
• To select Velocity - click on the 'Select Velocity button'
• To select Temperature - click on the 'Select Temperature button'
• To select any other variable - click on the 'Select a Variable button'

To change the direction of the plotting plane, set the slice direction to X, Y or Z

To change the position of the plotting plane, move the probe using the probe position buttons

.

Saving the results.

In the PHOENICS-VR environment, click on 'Save as a case', make a new folder called 'CONJUGAT ' (e.g.) and save as 'CASE1' (e.g.).