Motivated by geomorphological bedforms such as dunes in various aeolian and subaqueous environments, we study the interaction of a fluid flow with a granular structure. The flow field interacting with the granular structure results in erosion, deposition, and transport, which eventually leads to the temporal evolution of the structure. The evolved granular structure causes the flow field to change, resulting in a coupling between the flow and the structure. Operating in a regime where hydrodynamic time scales are fast in comparison to the erosion time scale, we develop a quasi-steady 2D weakly non-similar turbulent boundary layer framework to compute the hydrodynamic shear stress, which then couples to mass conservation of the granular structure for its evolution. This framework allows us to model the formation and evolution of various bedforms like ripples and dunes. If time permits, we will also discuss some preliminary data from our particle-resolved DNS study.
Zoom Link: https://icts-res-in.zoom.us/j/98486602678?pwd=17YieXrZTVNCUV6oyXZkX7cRiewTG7.1
Meeting ID: 984 8660 2678
Passcode: 241999