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Simulating Turbulence Over Canopies

By improving our understanding of turbulent flow over canopies we can design better cities to improve air quality. This is just one of the applications of the work of Alfredo Pinelli, a professor at City University of London working on Large Eddy Simulations (LES) of turbulence. Interview with University of Oxford Mathematician Dr Tom Crawford. This video is part of a collaboration between FYFD and the Journal of Fluid Mechanics featuring a series of interviews with researchers from the APS DFD 2017 conference. Sponsored by FYFD, the Journal of Fluid Mechanics, and the UK Fluids Network. Produced by Tom Crawford and Nicole Sharp with assistance from A.J. Fillo. For more maths related fun check out Tom's website https://tomrocksmaths.com/ Get your Tom Rocks Maths merchandise here: https://beautifulequations.net/collec... ------- Follow Tom: Website: https://tomrocksmaths.com/ YouTube:    / tomrocksmaths   Twitter:   / tomrocksmaths   Facebook:   / tomrocksmaths   Instagram:   / tomrocksmaths   Follow FYFD on: Website: http://fyfluiddynamics.com Twitter:   / fyfluiddynamics   Patreon:   / fyfd   FYFD Supporters: http://fyfluiddynamics.com/supporters Follow JFM on: Website: https://www.cambridge.org/core/journa... Youtube:    / cambridgeupacpro   Twitter:   / jfluidmech   Follow the UK Fluids Network on: Website: https://fluids.ac.uk/ Twitter:   / ukfluidsnetwork   Follow Nicole: Website: http://nicolesharp.com Twitter:   / aerognome   -------- Featuring: A. Monti et al. "Large-Eddy-Simulation of a flow over a submerged rigid canopy" http://meetings.aps.org/link/BAPS.201... We have performed a wall-resolved Large-Eddy-Simulation of flow over a shallow submerged rigid canopy (𝐻/ℎ=4; 𝐻 and ℎ are the open channel and the canopy heights respectively) in a transitional/dense regime (Nepf ARFM 44, 2011), at low Reynolds number (𝑅𝑒𝑏=𝑈𝑏𝑢𝑙𝑘𝐻/𝜈=6000). An immersed boundary method (Favier et al. JCP 261, 2013) has been adopted to represent filamentous rigid elements of the canopy. The presence of the permeable and porous canopy induces a typical inflection point in the mean velocity profile, depicting two separated and developed layers, outer boundary layer and in-canopy uniform flow. The aim of the work is to explore and unravel the mechanisms of the interaction between the fluid flow and the rigid canopy by identifying the physical parameters that govern the mixing mechanisms within the different flow layers and by exploring the impact of the sweep/ejection events at the canopy edge. The results show that the flow is characterised by large scale stream- and span-wise vortices and regions of different dynamics that affect also the filamentous layer, hence the mixing mechanisms. Publication: https://doi.org/10.1063/1.5095770 Special Thanks To: Nicole Sharp A. J. Fillo Alfredo Pinelli J. Pacquette G. Pichon Unripe Content