Let me introduce the steps of fluid simulation to you. First, use other three-dimensional modeling software, such as UG, Pro/e and Solidworks, to generate fluid domain (that is, the area where the fluid passes is an entity), and then import the generated entity into grid division software, such as Gambit and ICEM CFD, and export it to a format that Fluent can support after grid division. Import the grid file into Fluent, and you can simulate the fluid by setting it.

Fluent is only a tool for fluid analysis, and it can't model itself or mesh itself. If ANSYS 12.0 is installed on your computer, both ICEM CFD and Fluent have been integrated in it.