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|Title: ||Transition in A 2D Lid-Driven Cavity Flow|
|Authors: ||Yih-FerngPeng;Yuo-HsienShiau;Robert R.Hwang|
|Keywords: ||Transition;Cavity flow;Direct numerical simulation|
|Issue Date: ||2018-05-24T06:48:03Z
|Publisher: ||Computers & Fluids|
|Abstract: ||Abstract:Direct numerical simulations about the transition process from laminar to chaotic flow in square lid-driven cavity flows are considered in this paper. The chaotic flow regime is reached after a sequence of successive supercritical Hopf bifurcations to periodic, quasi-periodic, inverse period-doubling, period-doubling, and chaotic self-sustained flow regimes. The numerical experiments are conducted by solving the 2-D incompressible Navier–Stokes equations with increasing Reynolds numbers (Re). The spatial discretization consists of a seventh-order upwind-biased method for the convection term and a sixth-order central method for the diffusive term. The numerical experiments reveal that the first Hopf bifurcation takes place at Re equal to 7402±4%, and a consequent periodic flow with the frequency equal to 0.59 is obtained. As Re is increased to 10,300, a new fundamental frequency (FF) is added to the velocity spectrum and a quasi-periodic flow regime is reached. For slightly higher Re (10,325), the new FF disappears and the flow returns to a periodic regime. Furthermore, the flow experiences an inverse period doubling at 10,325 <Re< 10,700 and a period-doubling regime at 10,600 <Re< 10,900. Eventually, for flows with Re greater than 11,000, a scenario for the onset of chaotic flow is obtained. The transition processes are illustrated by increasing Re using time–velocity histories, Fourier power spectra, and the phase–space trajectories. In view of the conducted grid independent study, the values of the critical Re presented above are estimated to be accurate within ±4%|
|Relation: ||32(3) pp.337-352|
|Appears in Collections:||[系統工程暨造船學系] 期刊論文|
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