STAR-CCM+ is a general purpose finite volume formulation continuum mechanics solver for turbulent incompressible/compressible multi-phase fluid flow, heat transfer, structural mechanics and fluid-structure interactions. In nuclear energy applications, STAR-CCM+ is principally used for simulations of turbulent flow and heat transfer, often with multi-phase and/or phase change phenomena, in complex geometries of nuclear reactor primary systems. STAR-CCM+ provides two coupling interfaces that enable integration as a component of multiphysics or multiscale simulations via user coding. STAR-CCM+ is a commercial software package licensed by Siemens PLM; license cost contributions must be considered in planning for use of the code.