Large-Eddy Simulation of an Open Channel Flow with Submerged Rigid Vegetation
Flexible slender structures embedded in fluid flows are everywhere. Hairy surfaces are abundant in nature and perform multiple functions: e.g. thermal regulation, water harvesting, flow sensing, transport of species. While a great deal is known about the interplay between individual fibres and fluid flows, considerably less work has been done on flows interacting with ensembles of fibres, such as fur, hair, feathers or vegetation canopies. The particular case of vegetative canopies in river flows represents a paradigmatic example of the wide range of possible interactions between flows and ensembles of slender elements and how nature or human intervention can exploit this interplay to either mitigate disruptive events or to enhance the efficiency of a number of transport processes highlighting the importance of canopy-flow interactions on societal and environmental issues and the advantages that can be achieved by properly managing their reciprocal action.