You will have to define them as a variable in CFDPost. If you used a two equation turbulence model then u', v' and w' will all be equal, and given by u'=sqrt(2*k/3) (see http://www.cfdonline.com/Wiki/Turbulence_intensity). If you used RSM they can be different, look up a turbulence textbook for the equations for that one.
If you used LES then are you talking about the resolved eddies or the subgrid turbulence? 
Thanks!
Thank you Glenn. I'm using a two equation turbulence model, so I guess it's the easy way. Thanks again!!
Francisca 
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