criteria for guessing coupling interval

Submitted by evansmuts on Tue, 06/25/2013 - 15:26


Is there any official criteria for guessing the coupling interval size and/or CFD timestep size based on particle/fluid properties? (DEM has the Rayleigh and Hertz criteria based on particle properties for particle collision time steps)

Or is it just a matter of trial and error (experience) to find what works best?