Lito Yap
Ansys Employee

@Kokiabe, 

As mentioned, you can run the script without opening the CAD/GUI using the command line. With the -nw/-hide argument, this will hide the CAD/GUI from being displayed/shown in your desktop.  

Just wanted to let you know that when running scripts it will always "checkout or take up" a GUI license. If you want to avoid "checking out or using a GUI license" to run the script, this is not possible.