Investigation of flow pulsation phenomena in a sub-channel geometry using Detached Eddy Simulation approach

This abstract provides a summary of work-in-progress on using the Detached Eddy Simulation (DES) based turbulence modeling approach to investigate the flow pulsation phenomena in a twin rectangular sub-channel geometry. The objectives of the present research work are: (i) numerical identification of the flow pulsation phenomena by resolving the effects of large-scale pulsating flow, (ii) understanding the dynamics of the flow pulsation phenomena and formulating a detailed description of the flow field, (iii) numerical identification of the turbulent structures present in the flow field and (iv) identifying the physical mechanism(s) responsible for the cause of the flow pulsations. The effect of channel length was studied for the base line case. It was found, that the model could correctly predict high levels of turbulence intensity in the near-gap region. Alternate patterns of high velocities being directed on either side of the gap was observed, which leads to efficient cross-flow mixing.