Making a review paper with a subject in CFD

Hey guys,
recently I wrote a review paper regarding hypersonic flight regime taking information from various sources, but after sending it for review, I still haven't got any feedback and so I'm a little worried that it might not be very good at all...this time,though I want to do more mature work and I request you to suggest a good topic in CFD which I could use to write a review paper....perferably one of those topics which are currently in hot speculation.

Thanking you in advance for any help,
Urmi.