23.3.14 Creating and Modifying Injections

You will use the Injections dialog box (Figure  23.3.8) to create, copy, delete, list, read, and write injections.

Define $\rightarrow$ Injections...

Figure 23.3.8: The Injections Dialog Box

(You can also click the Injections... button in the Discrete Phase Model dialog box to open the Injections dialog box.)

Creating Injections

To create an injection, click the Create button. The Set Injection Properties dialog box will open automatically to allow you to set the injection properties (as described in Section  23.3.15). After the injection is created, the new injection will appear in the Injections list, in the Injections dialog box.

Modifying Injections

To modify an existing injection, select its name in the Injections list and click the Set... button. The Set Injection Properties dialog box will open, and you can modify the properties as needed.

If you have two or more injections for which you want to set some of the same properties, select their names in the Injections list and click the Set... button. The Set Multiple Injection Properties dialog box will open, which will allow you to set the common properties. For instructions about using this dialog box, see Section  23.3.18.

Copying Injections

To copy an existing injection to a new injection, select the existing injection in the Injections list and click the Copy button. The Set Injection Properties dialog box will open with a new injection that has the same properties as the injection you selected. This is useful if you want to set another injection with similar properties.

Deleting Injections

You can delete an injection by selecting its name in the Injections list and clicking the Delete button.

Listing Injections

To list the initial conditions for the particle streams in the selected injection, click the List button. ANSYS FLUENT reports the initial conditions (in SI units) in the console under various columns:

• The particle stream number is in the column headed NO.

• The particle type ( IN for inert, DR for droplet, or CP for combusting particle) is in the column headed TYP.

• The $x$, $y$, and $z$ positions are in the columns headed (X), (Y), and (Z).

• The $x$, $y$, and $z$ velocities are in the columns headed (U), (V), and (W).

• The temperature is in the column headed (T).

• The diameter is in the column headed (DIAM).

• The mass flow rate in the column headed (MFLOW).

Reading and Writing Injections

To transfer information about DPM injections from one case file to another, use the Read... and Write... buttons. You can write selected injections to a file, which can be read into a different ANSYS FLUENT session, simplifying the setup of new case files. To write the injection, select the injection from the list, then click Write.... The Select File dialog box (see Section  2.1.6) will open where you can enter the name of your injection file. To read in an injection, click Read... to open the Select File dialog box (see Section  2.1.6) where you will select the injection file to read in. If the injection that you imported has the same name as that in your current case, then ANSYS FLUENT will rename the imported injection.

After reading injections, you may need to visit the Injections dialog box to modify the settings for the injection material and the DPM laws since the presumed settings may have changed in the current case file setup.

Shortcuts for Selecting Injections

ANSYS FLUENT provides a shortcut for selecting injections with names that match a specified pattern. To use this shortcut, enter the pattern under Injection Name Pattern and then click Match to select the injections with names that match the specified pattern. For example, if you specify drop*, all injections that have names beginning with drop (e.g., drop-1, droplet) will be selected automatically. If they are all selected already, they will be deselected. If you specify drop?, all surfaces with names consisting of drop followed by a single character will be selected (or deselected, if they are all selected already).