If you want to work with some of the best masterminds in CFD, don't think twice before you apply for this one ;)
[N.B.: I personally worked at PSI for 4 years and were some of the best years of my life. The CFD group is very diverse and the culture is healthy. Also, PSI (being the biggest research institute for natural sciences in Switzerland) attracts every year a plethora of the world's most renowned scholars from all over the planet]