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 ...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(Re_(T),Re_(B))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 parameterα.Parameterαhas been defined in the rangeα∈[-π4,0]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 NeimarkSacker bifurcations have been determined as a function ofα.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.展开更多
基金supported by the projects of the Northwestern Polytechnical University(No.G2021KY05103)the Natioanl Key Laboratory of Science and Technology on Aerodynamic Design and Research(No.614220121030101)+2 种基金the Key Laboratory of Icing and Anti/De-icing of China Aerodynamics Research and Development Center(No.IADL20210302)the Spanish Government(Nos.FIS 2016-77849-R and PID2020114043GB-I00),the Catalan Government(No.2017-2017-SGR00785)the Barcelona Supercomputing Centre(Nos.FI2017-2-002,FI-2017-3-0009,and FI-2016-3-0038)。
文摘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(Re_(T),Re_(B))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 parameterα.Parameterαhas been defined in the rangeα∈[-π4,0]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 NeimarkSacker bifurcations have been determined as a function ofα.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.
