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Numerical Analysis of Turbulent Flow over a Backward-facing Step in an Open Channel

Saleem Bala Kawa M., Mustafa Andam, Kareem Dalshad Ahmed, Yuce Mehmet Ishak, Szydłowski Micchał, Al-Ansari Nadhir

Archives of Hydro-Engineering and Environmental Mechanics

2023

Vol. 70, nr 1

49--69

Computational examinations of the flow field in an open channel having a single Backward- -Facing Step (BFS) with a constant water depth of 1.5 m were performed. The effects of the expansion ratio, and the flow velocity along the reattachment length, were investigated by employing two different expansion ratios of 1.5 and 2, and eight various flow velocities of 0.5, 1, 2, 3, 4, 5, 7.5 and 10 m/sec in the Computational Fluid Dynamic (CFD) simulations. Commercially available CFD software, ANSYS FLUENT, was used for calculations. The simulation outcomes were verified using experimental results. Moreover, analyses were performed by using two equation turbulence closure models, K-ε family (standard, RNG and realizable), and K-ω family (Wilcox’s and SST K-ω). The analyses have revealed that the reattachment length increases with an increase in the expansion ratio, the flow velocity and the Reynolds number. The results obtained for two expansion rates and eight different flow velocities have shown insignificant differences between one turbulence closure model and the others. Furthermore, it was observed that both velocity and expansion ratios have an effect on the reattachment zone size.

Symulacja numeryczna ruchu cieczy lepkiej w prostoliniowym kanale z uskokiem ścianki

Kosma Z.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2002

nr 18

207-212

Celem pracy było wykonanie symulacji numerycznych laminarnego ruchu cieczy lepkiej w prostoliniowym kanale z uskokiem ścianki-opartych na rozwiązywaniu zagadnienia początkowo-brzegowego dla pełnych równań Naviera-Stokesa, sprowadzonych do równania czwartego rzędu funkcji prądu. Obliczenia przepływów zostały wykonane dwukrokową metodą predyktor-korektor wstecznego różniczkowania w kanale o długości L = 20 na równomiernej siatce 600 x 30 dla liczb Reynoldsa: Re < 800.

The aim of this paper is to simulate the laminar motions of viscous incompressible fluid in a rectilinear backward-facing step. The numerical algorithms are based on solving an initial-boundary value problem for the fuli incompressible Navier-Stokes eąuations, written in the form of the fourth-order equation for the steam function. Calculations have been carried out for channel length L = 20 on the uniform grid 600 x 30 for Reynolds numbers Re < 800 using the two-step backward-differentiation predictor-corrector method.