We can see on Simscape an element called Variable Local Restriction (2P) and one of its parameter is: Flow discharge coefficient
The descriptions says:
Ratio of the actual to the theoretical mass flow rate through the restriction. The discharge coefficient is an empirical parameter used to account for non-ideal effects such as those due to restriction geometry. The default value is 0.64.
But how this can be empirically tuned? How it affects the pressure and flow?