To our understanding, the mixed precision version uses mainly single precision arithmethic, with a few subroutines/variables that are in double precision accuracy.
STAR-CCM+ offers double precision and so called mixed precision versions. Double Precision/Mixed Precision Versions 14.02.012, which you will find in the absolute paths on tetralith. The internal numbering for the 2019 version is still e.g. We follow this official numbering scheme. Please note that STAR-CCM+ has changed its version numbering system from 2019 on.