Numerical investigation of turbulent flow in a twin rectangular sub-channel geometry

This abstract provides a summary of work-in-progress on using the Detached Eddy Simulation (DES) based turbulence modeling to investigate inter sub-channel thermal mixing. The effect of coherent vortical structures formed in the gap regions of sub-channel geometries was studied numerically. The study was performed on twin rectangular sub-channel geometry at a bulk Reynolds number of 2.15xl0³ with two different mesh structures. It was found that the code could correctly predict the qualitative effects of the flow pulsation phenomena on the turbulent flow field. The effect of numerical scheme on the performance of the DES model was studied as well.