BSA Flow Software Installation and User's Guide - CSI

Regions
Figure 5-39 Motion pattern, Cylindrical mesh
Regions are used to adapt hardware settings to local conditions.
Consider a wake flow measurement:
In the free stream, there may be a high mean velocity and a very low
turbulence level, whereas in the wake, the mean velocity can be low and the
turbulence level high.
If a “free stream” and a “wake” region are defined, the LDA 1,2.. properties
Center velocity and Velocity span properties can be set such that the
processor resolution is optimally exploited in both regions.
Near a wall, it might be useful to reduce the PM high voltage setting, so a
near wall region could be defined to handle this.
The number of processor channels and traverse channels and are fixed for a
project file, but any other property can be changed from one region to
another.
Each region’s traverse mesh may be identical to another region’s, or
different. This means that experiment conditions could be changed, and the
same mesh used again within the same project file, to keep related data in a
single file.
In the BSA Application's table of positions, each position has an associated
line number, like in a spreadsheet. If several regions are used, the first line
number in the second region is 1 higher than the last line number in the first
region. The line number is used as the index, when graphs or lists from
single positions are shown (right click on the graph object, select position,
etc.).
Default is a single region. To define more regions, you can either:
• right click on Region 1 (or another region), and select Insert region,
or
• right click on Region 1 (or another region), and select Duplicate
The Duplicate function is recommended, because it duplicates all properties,
so that only the ones to be modified need to be touched afterwards.
A region can be deleted by right clicking on its icon, and selecting Delete.
A region can be renamed either by right clicking on its icon, and selecting
Rename, or by clicking on its icon and overwriting the name.
BSA Flow Software: Project explorer objects 5-45