An Implementation of Turbulence Models into the CUPID code

A component-scale thermal-hydraulics analysis module, CUPID has been being developed for a transient three-dimensional two-phase flow analysis of nuclear reactor components. CUPID is based on a two-fluid, three-field model, which is solved by using an unstructured finite volume method. At present, turbulence effects are not considered in the CUPID code. However, the turbulence model is not to be neglected in a liquid single phase flow or a subcooled boiling flow even though a turbulence could be less important in other flow regimes of two phase flows. In this paper, the implementations of turbulence models into CUPID are discussed