CFD Prediction of the Inlet Nozzle Velocity Profiles for the CANDU Moderator Analysis

Abstract

For predicting the inlet velocity profile at the CANDU-6 moderator nozzles, a commercial CFD code was tested and applied. The fluid flows going through the moderator piping network have three sections, which are characterized as a straight pipe flow, a curved pipe flow, and an impinging jet, respectively. Some experimental data were chosen for each flow, and various turbulence models were tested and optimized. As a result of the investigation, detailed velocity profiles and turbulent parameters at the nozzle outlets were obtained, which could be used as inlet boundary conditions in the CANDU moderator analysis.