Assessment of four inflow conditions on large-eddy simulation of a gently curved backward-facing step

Asgari, Ehsan; Tadjfar, Mehran

doi:10.1080/14685248.2016.1253845

Cited by 9 publications

(1 citation statement)

References 39 publications

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“…Recently, several numerical and experimental studies in the field of BFS flow over various step angles (Bayraktar 2014), control of the reattachment length of a transonic 2D BFS flow (Bolgar et al 2015), simulation of a gently curved BFS (Asgari and Tadjfar 2017), simulation of turbulent flows over a BFS by using a modified partially averaged Navier-Stokes model (Huang et al 2017), heat transfer and fluid flow characteristics of separation and reattachment flow over a BFS (Xie and Xi 2017) and high intensity turbulent flow over a BFS (de la Torre et al 2017) are conducted by scholars. For comparison between the cited works and to identify the novelty of current study, we present a summary of the cited works in Table 1.…”

Section: Introductionmentioning

confidence: 99%

On the Instability of Two Dimensional Backward-Facing Step Flow using Energy Gradient Method

Nowruzi

Nourazar

Ghassemi

2018

JAFM

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In the present paper, the energy gradient method is implemented to study the instability of 2-D laminar backward-facing step (BFS) flow under different Reynolds numbers and expansion ratios. For this purpose, six different Reynolds numbers (50 ≤ Re ≤ 1000) and two various expansion ratios of 1.9423 and 3 are considered. We compared our results of the present study with existing experimental and numerical data and good agreement is achieved. To study of fluid flow instability, we evaluated the distributions of velocity, vorticity and energy gradient function K. The results of our study show that as the expansion ratio decreases the flow becomes more stable. We also found that the origin of instability in the entire flow field is located on the separated shear layer nearby the step edge. In addition, we approved that the inflection point on the profile of velocity corresponds to the maximum of vorticity resulted to the instability.

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