23.3.18 Defining Properties Common to More than One Injection

If you have a number of injections for which you want to set the same properties, ANSYS FLUENT provides a shortcut so that you do not need to visit the Set Injection Properties dialog box for each injection to make the same changes.

As described in Section  23.3.15, if you select more than one injection in the Injections dialog box, clicking the Set... button will open the Set Multiple Injection Properties dialog box (Figure  23.3.14) instead of the Set Injection Properties dialog box.

Figure 23.3.14: The Set Multiple Injection Properties Dialog Box

Depending on the type of injections you have selected (single, group, atomizers, etc.), there will be different categories of properties listed under Injections Setup. The names of these categories correspond to the headings within the Set Injection Properties dialog box (e.g., Particle Type and Stochastic Tracking). Only those categories that are appropriate for all of your selected injections (which are shown in the Injections list) will be listed. If all of these injections are of the same type, more categories of properties will be available for you to modify. If the injections are of different types, you will have fewer categories to select from.

Modifying Properties

To modify a property, perform the following steps:

1.   Select the appropriate category in the Injections Setup list. For example, if you want to set the same flow rate for all of the selected injections, select Point Properties. The dialog box will expand to show the properties that appear under that heading in the Set Injection Properties dialog box.

2.   Set the property (or properties) to be modified, as described below.

3.   Click Apply. ANSYS FLUENT will report the change in the console window.

You must click Apply to save the property settings within each category. If, for example, you want to modify the flow rate and the stochastic tracking parameters, you will need to select Point Properties in the Injections Setup list, specify the flow rate, and click Apply. You would then repeat the process for the stochastic tracking parameters, clicking Apply again when you are done.

There are two types of properties that can be modified using the Set Multiple Injection Properties dialog box.

The first type involves one of the following actions:

• selecting a value from a drop-down list

• choosing an option using a radio button

The second type involves one of the following actions:

• entering a value in a field

• turning an option on or off

Setting the first type of property works the same way as in the Set Injection Properties dialog box. For example, if you select Particle Type in the Injections Setup list, the dialog box will expand to show the portion of the Set Injection Properties dialog box where you choose the particle type. You can simply choose the desired type and click Apply.

Setting the second type of property requires an additional step. If you select a category in the Injections Setup list that contains this type of property, the expanded portion of the dialog box will look like the corresponding part of the Set Injection Properties dialog box, with the addition of Modify check buttons (see Figure  23.3.14). To change one of the properties, first turn on the Modify check button to its left, and then specify the desired status or value.

For example, if you would like to enable stochastic tracking, first turn on the Modify check button to the left of Stochastic Model. This will make the property active so you can modify its status. Then, under Property, turn on the Stochastic Model check button. (Be sure to click Apply when you are done setting stochastic tracking parameters.)

If you would like to change the value of Number of Tries, select the Modify check button to its left to make it active, and then enter the new value in the field. Make sure you click Apply when you have finished modifying the stochastic tracking properties.

The setting for a property that has not been activated with the Modify check button is not relevant, because it will not be applied to the selected injections when you click Apply. After you turn on Modify for a particular property, clicking Apply will modify that property for all of the selected injections, so make sure that you have the settings the way that you want them before you do this. If you make a mistake, you will have to return to the Set Injection Properties dialog box for each injection to fix the incorrect setting, if it is not possible to do so in the Set Multiple Injection Properties dialog box.

Modifying Properties Common to a Subset of Selected Injections

Note that it is possible to change a property that is relevant for only a subset of the selected injections. For example, if some of the selected injections are using stochastic tracking and some are not, enabling the Random Eddy Lifetime option and clicking Apply will turn this option on only for those injections that are using stochastic tracking. The other injections will be unaffected.