Are you trying to run a CFD on a whole airframe? If so, stop trying, because without knowing what compute resources you have, I can safely assume you haven't got enough.

Also, CFD on a cowling is a highly non-trivial analysis. A cowling is probably right behind a propeller with a spinner resulting in highly non-trivial turbulent inflow to the cowling. What geometry do you want to put behind the the cowling to make the analysis significantly meaningful or accurate?

Turbulent flow is by definition time dependant thereby requiring orders of magnitude more compute resources and/or inaccurate guesswork shortcuts.

Last but not least, maybe I'm mistaken, but as far as I know with regard to CFD, the "EAA version" of SW is no different from the regular educational edition that in turn is no different from the commercial edition.

Bottom line: Could you give us some indication of what you mean by "... EAA version does not allow CFD ..."?