Here are some examples of adapted meshes obtained with MEF++:

 
Adaptation for Fluent

Adaptation based on the function atan(80*(x^4*y^4*z^4 - 0.25^4))

Adaptation based on the function exp(-(10*((x-1)^2 +(y-1)^2 + (z-1)^2)))

Adaptation based on the function 5*exp(-(100*((x-1)^2))) on a cylinder

Adaptation based on the function 5*exp(-(100*((x-1)^2))) on a cube

Adaptation based on the function of a sphere on a cylinder

Adaptation (real case) of air flow around a missile

Adaptation (real case) of an incompressible flow in a driven cavity (by Robert Guénette)

Adaptation (real case) of an incompressible flow in a contraction (by Robert Guénette)
 

Before adaptation	After adaptation

Initial cube used for the above examples: