For quick and dirty CFD solutions, it's ok, but there are other alternatives, like flowizard (also from fluent) and CFDesign, not to mention fluent itself.
It all depends on the results and calculations you need to perform.
For general heat transfer solutions including all types of heat transfer, use fluent (or ansys cfx).
meaby so but ansys is hard to use
and to get something really good defined take a long time and of course a good understanding
and it looks that fluent for catia much easier to use
and hense they calc airplanes with it
Maybe you are right and Fluent for Catia is only for a preliminar design or approach in order to get better designs.
No specific program shall be substituted by a module which is integrated in Catia, but in any project exists the preliminar analysis in order to estimate the first value.
I'm not sure about Fluent, but several other analysis packages are available that are not just "a module which is integrated in CATIA". They are fully functioning applications that happen to use CATIA as their graphical interface. Worst case, they use CATIA as a pre-processor and post-processor, and submit full blown analysis to an external solver.
