Journal of Computational Fluids Engineering ISSN:1598-6071(Print) 3022-6252(Online) 한국전산유체공학회지

In this study, a turbulence model was defined at the interface between one-dimensional(1D) pipes and multidimensional(MD) structures. In the existing GAMMA+ code, turbulent flow at the junction between 1D and MD regions is calculated by directly applying the turbulent kinetic energy and dissipation rate from the edge cells of the MD structure, which can result in non-physical turbulence predictions. To address this issue, a turbulence model was developed for the 1D-MD interface, based on the turbulent kinetic energy and dissipation rate approach implemented in ANSYS FLUENT. Validation calculations were performed on an integrated system of a 1D pipe and a 3D component. The results indicate that predictions obtained with the proposed turbulence model are more consistent with the target solutions, suggesting improved physical accuracy over the existing turbulence model.