Square cavity flow driven by two mutually facing sliding walls
We investigate the flow inside a 2D square cavity driven by the motion of two mutually facing walls independently sliding at different speeds. The exploration, which employs the lattice Boltzmann method (LBM), extends on previous studies that had the two lids moving with the exact same speed in oppo...
| Autores: | , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/392414 |
| Acesso em linha: | https://hdl.handle.net/2117/392414 https://dx.doi.org/10.1631/jzus.A2200447 |
| Access Level: | acceso abierto |
| Palavra-chave: | Fluid dynamics Unsteady flow (Fluid dynamics) Two-sided wall-driven cavity Velocity ratios Transitions Flow topology Energy cascade Dinàmica de fluids Flux de transició (Dinàmica de fluids) Àrees temàtiques de la UPC::Física::Física de fluids::Flux de fluids |
| Resumo: | We investigate the flow inside a 2D square cavity driven by the motion of two mutually facing walls independently sliding at different speeds. The exploration, which employs the lattice Boltzmann method (LBM), extends on previous studies that had the two lids moving with the exact same speed in opposite directions. Unlike there, here the flow is governed by two Reynolds numbers (ReT, ReB) associated to the velocities of the two moving walls. For convenience, we define a bulk Reynolds number Re and quantify the driving velocity asymmetry by a parameter a. Parameter a has been defined in the range a¿[-p/4, 0] and a systematic sweep in Reynolds numbers has been undertaken to unfold the transitional dynamics path of the two-sided wall-driven cavity flow. In particular, the critical Reynolds numbers for Hopf and Neimark-Sacker bifurcations have been determined as a function of a. The eventual advent of chaotic dynamics and the symmetry properties of the intervening solutions are also analyzed and discussed. The study unfolds for the first time the full bifurcation scenario as a function of the two Reynolds numbers, and reveals the different flow topologies found along the transitional path |
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