The following units are not converted when the system of units is changed:
mesh units
parameters of boundary condition laws
parameters for evolution or time-marching schemes
parameters that depend on field variables
user-defined functions (Also, UDFs must be written in a system of units that is consistent with the rest of the problem definition, as any other material law.)
initial thickness (for film casting or blow molding)
initial temperature (for nonisothermal simulations)
initial concentration (for species transport)
material data for mass transfer sub-tasks