4.5 Article

Prediction on steady-oscillatory transition via Hopf bifurcation in a three-dimensional (3D) lid-driven cube

期刊

COMPUTERS & FLUIDS
卷 229, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compfluid.2021.105068

关键词

Steady-oscillatory transition; Hopf bifurcation; Three-dimensional (3D) lid-driven cavity flow; Critical Reynolds number; SCM-ACM

资金

  1. Natural Science Foundation of Shandong Province [ZR2019QEE040, ZR2019MEE015]
  2. State Key Laboratory of Structural Analysis for Industrial Equipment [GZ18113]
  3. Science and Technology Commission of Shanghai Municipality [20DZ1205002]

向作者/读者索取更多资源

The study investigates the transition from 3D steady flow to time-periodic oscillatory flow in a cube using massive computations, developing a high-precision combined method for numerical solution. Results show the significant effect of initial conditions and the critical Reynolds number on the transition process.
Massive computations of three-dimensional (3D) flow in subcritical flow state are carried out to investigate the transition from 3D steady flow to time-periodic oscillatory flow via Hopf bifurcation in a cube. Previous prediction of the steady-oscillatory transition in published works has been summarized. The transition point in lid driven cavity has yet to come to consensus as the critical parameters are predicted in a wide range of values. The 3D unsteady governing equations are solved numerically using the spectral collocation method (SCM) in combination with the artificial compressibility method (ACM), SCM-ACM, a combined method with high accuracy that we developed. The temporal velocity evolution, amplitude evolution and dimensionless angular frequency are investigated. The accurate critical Reynolds number Re-cr is predicted by Richardson extrapolation. Results show that the initial conditions have significant effect to obtain the velocity which gradually approaches to steady state in the subcritical flow state, and appropriate initial conditions are given to efficiently obtain stable results by gradually increasing Re. Exponential decay of velocity amplitude becomes weaker with the increase of Re, and the decay rate is strictly linear against Re, while the dimensionless angular frequency remains constant. The Re-cr is affected by the number of nodes, which has also been observed by Feldman and Gelfgat [1] and Kuhlmann and Albensoeder [2], while the critical frequency is unaffected by the number of nodes in the present results. It also indicates that the Re-cr and the constant dimensionless angular frequency can be innovatively predicted with more accuracy and much fewer nodes. The improved point of steady-oscillatory transition in 3D lid-driven cube is Re-cr = 1916.6 via Hopf bifurcation by Richardson extrapolation with dimensionless angular frequency omega = 0.5752.

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