Full Text:   <1347>

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Suppl. Mater.: 

CLC number: 

On-line Access: 2024-08-27

Received: 2023-10-17

Revision Accepted: 2024-05-08

Crosschecked: 2023-07-20

Cited: 0

Clicked: 1475

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Bo AN

https://orcid.org/0000-0001-8738-2504

Josep M. BERGAD�

https://orcid.org/0000-0003-1787-7960

F. MELLIBOVSKY

https://orcid.org/0000-0003-0497-9052

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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.7 P.612-624

http://doi.org/10.1631/jzus.A2200447


Square cavity flow driven by two mutually facing sliding walls


Author(s):  Bo AN, Josep M. BERGAD�, Weimin SANG, Dong LI, F. MELLIBOVSKY

Affiliation(s):  School of Aeronautics, Northwestern Polytechnical University, Xi�an 710072, China; more

Corresponding email(s):   aeroicing@sina.cn

Key Words:  Two-sided wall-driven cavity, Velocity ratios, Transitions, Flow topology, Energy cascade



Abstract: 
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 α. Parameter α has been defined in the range α[-π/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 α. 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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