Encyclopaedia Index

WORKSHOP - Editing Properties of the Domain Fluid

In this workshop the gas methane (CH4) will be used as the domain fluid.

The properties of this gas are not stored in the PROPS file so the user will have to introduce them using the Main Menu. The properties to be introduced are:

The workshop also shows how objects 'made' from 'Domain material' can be used to make holes in other solids.

The geometry is shown below:

prop1.gif (8785 bytes)

Within PHOENICS VR Environment

Start with an 'empty' case - click on 'File' then on 'Start New Case', then on 'Core', then click on 'OK'; to confirm the resetting.

Within VR Editor

Set domain Size and Activate Solution of Variables

Click on 'Main Menu'

Click on 'Geometry'

Click on 'Domain size' under 'Z-direction' and enter 0.5

Change X-Auto, Y-Auto and Z-Auto all to Manual by clicking on the buttons. In this tutorial we will manually set a coarse grid.

Click on 'Number of cells' and under X-direction enter 30. Under Z-direction enter 40. Leave Y-direction at 1.

Click on 'OK' to close the Grid mesh settings dialog.

Click on 'Models' and Leave the default 'Solution for velocities and pressure' to ON.

Switch on the Energy Equation, select Temperature and click on OK.

Click on OK.

 

Set the properties of the Fluid

Click on 'Properties'

Click on 'The current domain material is' dialogue box 'Gases' and select '42 dummy fluid'. Click on OK

Click on 'Edit properties of current material'

Change the following to:

DENSITY:

Click on Density 'CONSTANT' and select 'Ideal Gas'. Enter 518 for GASCON and 1.4 for GAMMA.

Switch storage to ON.

VISCOSITY:

Click on Viscosity 'CONSTANT' and select 'Linear in Tabs'. Click on OK.

Enter 5.96E-06 for A and 4.5838E-08 for B.

Switch storage to ON.

SPECIFIC HEAT:

Change specific heat from CP=1 to CP= 2230

CONDUCTIVITY:

Click on COND=10 and enter 3.42E-04

THERMAL EXPANSION COEFFICIENT:

Click on Beta=0 and enter 3.330E-03

Click on 'Previous Panel'

Click on 'Top Menu' and 'OK';.

Click 'Reset' on the Movement control panel, then 'Fit to window' to re-scale the view to fit the geometry.

 

Create the objects making up the scene

Click on the 'Object Management' button (O on the toolbar or image172.gif (1000 bytes) on the hand set). This will display a (currently empty apart from the domain) list of objects.

Create the UWALL object

Click on 'Object', 'New', 'New object'.

Change Name to UWALL

Click on 'Size' to set the Size of object as:

XSize: tick 'To end'

YSize: tick 'To end'

ZSize: 0.02

Click on 'Place' to set the Position of object as:

XPos: 0.0

YPos: 0.0

ZPos: tick 'At end'

Click on 'General'.

Click on 'Attributes'

Click on 'Other materials', then 'Solids' and select '111 STEEL at 27 deg C'

The grid is too coarse to calculate accurate heat transfer coefficients. Change the Heat transfer coeff setting from 'Wall function' to 'User'. The default value of 10W/m2/K will suffice.

Click on OK/OK

 

Create LWALL object by duplication from UWALL.

Click on Duplicate button in the main control panel or toolbar Duplicate using array (952 bytes) and then 'OK'.

Click twice on the new object and change the Name to LWALL.

Untick 'At-end' in Z, then move the new object to Zpos=0.0

Click on OK

 

Create WWALL1 Object

Click on 'Object', 'New', 'New object'.

Change Name to WWALL1

Click on 'Size' to set the Size of object as:

XSize: 0.02

YSize: tick 'To end'

ZSize: 0.15

Click on 'Place' to set the Position of object as:

XPos: 0.0

YPos: 0.0

ZPos: 0.35

Click on 'General'

Click on 'Attributes'

Click on 'Other materials', then 'Solids' and select ‘111 STEEL at 27 deg C (C=1%)

Change the Heat transfer coeff setting from 'Wall function' to 'User'.

Click on OK/OK

 

Create WWALL2 object by duplication from WWALL1.

Click on Duplicate button in the VR Editor and 'OK'

Move the new object to Zpos=0

Click twice on the new object and change the Name to WWALL2. Click on OK.

 

Create EWALL1 object by duplication from WWALL2.

Click on Duplicate button in the VR Editor and 'OK'.

Double click on the newly duplicated object

Change the Name to EWALL1.

Change the position and size of the new object to:

XPos: tick 'At end' XSize: 0.05

YPos: 0.0 YSize: 'To end'

ZPos: 0.35 ZSize: 0.15

Click on OK.

 

Create EWALL2 object by duplication from WWALL2.

Click on Duplicate button in the VR Editor and 'OK'.

click twice in the newly duplicated object .

    Change the Name to EWALL2

    Change the position and size to:

    XPos: 'At end' XSize: 0.05

    YPos: 0.0 YSize: 'To end'

    ZPos: 0.0 ZSize: 0.15

    Click on OK.

 

Create Upper Wedge, WED1

Click on 'Object', 'New', 'New object'.

Change Name to WED1

Click on 'Size' to set the Size of object as:

XSize: 0.15

YSize: 'To end'

ZSize: 0.13

Click on 'Place' to set the Position of object as:

XPos: 0.8

YPos: 0.0

ZPos: 0.35

Click on 'General' and then 'Shape'.

Click on Geometry dialogue box and select /PUBLIC/SHAPES/WEDGE. Click on 'Open'.

Click on 'Attributes'

Click on 'Other materials', then 'Solids' and select '111 STEEL at 27 deg C'

Change the Heat transfer coeff setting from 'Wall function' to 'User'.

Click on 'OK'

Click on 'Options' and 'Rotation options' set value to 16.

Click on OK/OK.

 

Create Lower Wedge by duplication from WED1

Click on Duplicate button in the VR Editor and 'OK'.

Click on the new object

    Change the Name to WED2

    Change the position and size of the new object to:

    XPos: 0.8 XSize: 0.15

    YPos: 0.0 YSize: 'To end'

    ZPos: 0.02 ZSize: 0.13

    Click on 'Options' and 'Rotation options'.

    Set the value to 2. Click on OK/OK.

 

Create Upper Heat Source, HEAT1

Click on 'Object', 'New', 'New object'.

    Change Name to HEAT1

    Click on 'Size' to set the Size of object as:

    XSize: 0.07

    YSize: 'To end'

    ZSize: 0.18

    Click on 'Place' to set the Position of object as:

    XPos: 0.2

    YPos: 0.0

    ZPos: 0.3

    Click on 'General'.

    Click on 'Attributes'

    Click on 'Other materials', then 'Solids' and select '103 COPPER at 27 deg C' and then 'OK'

    Set Heat Source to 50W. Click on 'Adiabatic', select 'Fixed heat flux', and enter 50 for 'Value'.

    Change the Heat transfer coeff setting from 'Wall function' to 'User'.

    Click on OK/OK.

 

Create Lower Heat Source, HEAT2, by duplication from HEAT1

Click on Duplicate button in the VR Editor and 'OK'.

Click on twice on the new object.

    Change Name to HEAT2

    Click on 'Size' and set the Size of the new object as:

    XSize: 0.07

    YSize: 'To end'

    ZSize: 0.18

    Click on 'Place' and set the Position of the new object as:

    XPos: 0.2

    YPos: 0.0

    ZPos: 0.02

    Click on OK

 

Create blockage BLOCK1

Click on 'Object', 'New', 'New object'.

    Change Name to BLOCK1

    Click on 'Size' and set the Size of object as:

    XSize: 0.07

    YSize: 'To end'

    ZSize: 0.46

    Click on 'Place' and set the Position of object as:

    XPos: 0.5

    YPos: 0.0

    ZPos: 0.02

Click on 'Other materials', then 'Solids' and select '111 STEEL at 27 deg C'

Change the Heat transfer coeff setting from 'Wall function' to 'User'.

Click on OK

 

Create first hole in BLOCK1 - AIRHOL1 (must be created AFTER object BLOCK1 so that it overwrites the material properties of the blockage)

Click on 'Object', 'New', 'New object'.

    Change Name to Airhol1

    Click on 'Size' and set the Size of object as:

    XSize: 0.07

    YSize: 'To end'

    ZSize: 0.06

    Click on 'Place' and set the Position of object as:

    XPos: 0.5

    YPos: 0.0

    ZPos: 0.04

    Click on 'General'.

    Click on 'Attributes' and set material to Domain material.

    Click on OK/OK

 

Create remaining holes in BLOCK1 by array-copying AIRHOL1

    Click on the Array button Duplicate using array (952 bytes) and enter:

    Direction Dimension Pitch
    X 1 0.0
    Y 1 0.0
    Z 4 0.12

    Click on OK

To see the hole objects, right-click on BLOCK1 and tick 'Wireframe'.

Create Inlet

Click on 'Object', 'New', 'New object'.

Change Name to INLET

Click on 'Size' and set the Size of object as:

XSize: 0.0

YSize: 'To end'

ZSize: 0.2

Click on 'Place' and set the Position of object as:

XPos: 0.0

YPos: 0.0

ZPos: 0.15

Click on 'General' and select Type: INLET.

Click on 'Attributes' and leave Ambient 20 degrees for temperature, and set 1.0 m/s for X-direction velocity.

Click on OK/OK.

 

Create Outlet

Click on 'Object', 'New', 'New object'.

Change Name to OUTLET

Click on 'Size' and set the Size of object as:

XSize: 0.0

YSize: 'To end'

ZSize: 0.2

Click on 'Place' and set the Position of object as:

XPos: 'At end'

YPos: 0.0

ZPos: 0.15

Click on 'General'

Click on the Type dialogue box and select OUTLET.

Click on OK/OK.

 

Set remaining solution control parameters.

Click on Main Menu

Click on 'Numerics' and set Total number of Iterations to 300.

Click on Top menu

Click on Ok

 

Set the Monitoring Point

Adjust Monitoring position using the 'Position' buttons to;

X 0.4

Y 0.5

Z 0.24

 

Running the Solver.

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', 'Solver' then 'Local solver(Earth)', and click on 'OK' to confirm running Earth.

To view:

To select the plotting variable:

To change the direction of the plotting plane, set the slice direction to X, Y or Z slice direction (927 bytes)

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

probe position (927 bytes).

To make the objects see-through, click the 'Wire-frame' toggle (to the right of the Macro button on the second row of buttons). This will make the temperature contours inside the solids visible.

A typical plot from this case is:

prop2.gif (8785 bytes)

prop2.gif (8785 bytes)

 

Saving the results.

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