It is a good idea to do some reference simulations first, to get some feeling and making sure that you're using it the right way. There are many reference cases which enable comparison with analytic theory and experiments, like:
Fluent has many options, and is it often required to set many of these before a simulation can be (re)run. This is a tedious task, especially when running an couple of similar simulations. That's were automation, scripting and programming comes in. There isn't much documentation unfortunately, at least not official. The current scripting language is Scheme (a variant of Lisp), but rumors are that will be replaced by Python in the future.
