I'm looking to program some alternate visualization parameters for use with particle studies. 

Has anybody ever figured out the names for particle properties to use in definitions?

Like if I wanted to define the Stokes Number of particles in Flow, it's a relatively simple definition of diameter, velocity, density, viscosity.  But in all of the verbage I've tried I can't find how to get Flow to calculate a new parameter using a particle property as an input variable (diameter, velocity, etc).

Thanks.