A Threshold
displays all of the control volumes where the value of a specified solution variable is inside (or outside) a chosen range.
You can use this tool to locate areas of interest within a flow domain.
Unlike an isosurface, which plots an interpolated surface, a threshold includes all of the control volumes within its range.
Click the threshold icon
in the visualization toolbar.
In the properties panel, select the desired flow quantity from the Threshold Field dropdown.
Specify the Value Range by selecting a mode from the dropdown (Between, Greater than, or Less than) and entering the corresponding numeric value(s). To find the minimum and maximum values of the flow variable, click Calculate Min and Max in the Volume Range row.
(Optional) Select Smooth to clip boundary cells of the threshold so the result smoothly follows the field rather than the control volume boundaries.
(Optional) Select Invert to display the control volumes with values outside the threshold range instead of inside.
(Optional) Select Strict to show only the control volumes for which the node values meet the threshold requirement.
Click the check button to apply the settings.
Navigate to the Visualizations section of the control panel and select the Threshold that you just created.
Use the dropdown menus in the Display section to adjust the final appearance of the threshold volume.
Note: Strict is not compatible with Smooth.