Elucidating coherent structures, transport barriers and entrainment in turbulent fountains in stratified media
Resumen:
We analyse the flow organization of turbulent fountains in stratified media under different conditions, using threedimensional finite-time Lyapunov exponents. The dominant Lagrangian coherent structures responsible for the transport barriers in three different configurations suggest a self-similarity behaviour. After proposing a criterion for delimiting the boundary surface of the uprising fountain, we quantify the entrainment and re-entrainment rates under fully developed flow conditions using the proper coefficients. Finally, our analysis was applied to the Selective Inverted Sink, a technological application of turbulent fountains, identifying turbulence as the primary mechanism favouring the device’s efficiency.
| 2022 | |
| CSIC: Fisica Nolineal (ID 722) Programa Grupos I+D 2018 | |
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Laboratory procedures Lyapunov exponent Flow visualization Fluid flows Navier Stokes equations Plume dynamics Turbulence simulations Turbulent flows |
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| Inglés | |
| Universidad de la República | |
| COLIBRI | |
| https://hdl.handle.net/20.500.12008/41671 | |
| Acceso abierto | |
| Licencia Creative Commons Atribución - No Comercial - Sin Derivadas (CC - By-NC-ND 4.0) |
| Sumario: | Publicado también como: Physics of Fluids, 2022, 34(8): 085119. DOI: 10.1063/5.0098826 |
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