It utilizes a standard "Domain" system where you define the simulation bounds, then add emitters (Inflows), obstacles, and force fields.
“The FLIP Fluids addon is a tool that helps you set up, run, and render high quality liquid simulation effects all within Blender!” Superhive FLIP Fluids 1.0.8 for Blender 2.8 Full Version...
Unlike native tools, FLIP Fluids includes an "Inverse" obstacle setting, making it incredibly simple to contain liquid perfectly inside a bottle or glass without leaks. It utilizes a standard "Domain" system where you