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11) Although you can come back to this panel to specify regions at a later stage, it is generally good practice to create any regions that will be used throughout the wizard - i.e., for specifying boundary / initial conditions or field variables, as well as sources - at this stage. We will specify most of the boundary conditions at the entire boundary domain, so we need not create any regions for that purpose. We will create two regions however, one for the SOURCE command, and the other to have output in particular domain.

12) Here we will create a region to represent the source. Click "IJ/IJK Bounding Box >>". A dialog window appears. Enter the values as:

  1. Enter the Region Name as SOURCE.
  2. Enter the value of IJK (10,1,19) to IJK (24,6,19) (see Fig 1.8).
  3. Fig - 1.8: IJ/IJK Bounding Box

  4. Click "Create".

The created region after zooming it is shown on fig 1.9

Fig - 1.9: Created Source

13) The second region will be generated to specify as the problem output region. Click again "IJ/IJK Bounding Box" and enter the values as

  1. Enter the Region Name as OUTREG in text field.
  2. Enter the value from IJK (2,2,2) to IJK (64,25,19)
  3. Specify the interval 6 for I, 2 for J and 3 for K.
  4. Click "Create".

We now have 2 regions that we can use during our problem setup. Note that you can select which one of these regions to view using the combo box on the top right of the main window

14) Click "Next >" in the wizard dialog to reach the "Pre-defined Boundary types". Here one can define boundary types like inlets, outlets, walls, periodic or symmetry boundaries .The problem we are setting does not have any explicit boundary types to set so we will not work on any of these options. Note that by default all domain boundaries are treated as open boundaries, so we will go with the defaults.

15) Click "Next >" to reach "Initial & Boundary Conditions" (See fig 2.1). We will provide starting values for the problem by setting U as constant value.

Fig - 2.1: Window for Initial & Boundary Conditions

16) Click "Initial Conditions >>". A dialog box appears. Set the initial condition for U as follows:

  1. Select Dependent Variable as U.
  2. Check Replace previously specified condition (if any).
  3. Apply to "Entire Domain".
  4. Choose Constant and enter the value in the text field as 1.4E-06. (see Fig 2.2)
  5. Fig - 2.2: Initial Conditions dialog window

  6. Click "Apply".

17) Now Click "Boundary Conditions >>" option in order to set the all boundaries  as no flow boundaries.

  1. Select the dependent Variable as C.
  2. Check Flux as type of boundary condition.
  3. Apply to Entire Boundary at X+.
  4. Leave the Time as independent variable as we are going to specify constant value of flux so there will be no effect of this parameter.
  5. Select Constant and enter the value 0.0 in the text filed. (See Fig 2.3)
  6. Fig - 2.3: Boundary Conditions dialog window

  7. Click "Apply".

18) We have defined the C flux 0 at X+ boundary. Now Proceed further to specify the boundary condition at remaining five faces.

19) For Y-, Y+, Z- and Z+ we will apply same boundary condition as for X+. So change only entire boundary to Y-, Y+, Z-, Z+ and click Apply every time.

20) For X- everything will remain same as above except the boundary condition type as Value and Entire boundary at X-. Click "Apply".

21) Click "Next" to go to the "Fluid Properties & Constants". For the present problem we will not specify anything from this section.

22) Click "Next >" to reach "Solid Matrix Properties" dialog window as shown on fig 2.4

Fig - 2.7: Solid Matrix Properties dialog window

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