Check this webinar for more info:
https://www.youtube.com/watch?v=N0XJwTWpSbY&list=FLhlzOE6fdwy370JHn7yhdEA&index=59&t=0s
CATIA Elfini solver is quick and very reliable for linear analysis, but like Mr Ananth Narayan mentioned it is limited. You can't use it for non-linear analysis for example.
You can use Simulia Abaqus width Abaqus for CATIA interface.
There is also maybe integrated interface in CATIA for Ansys too.
I know that it exist for Fluent (Fluent for CATIA).
BR,
Slavisa