- Tytuł:
- Numerical Analysis of Turbulent Flow over a Backward-facing Step in an Open Channel
- Autorzy:
-
Saleem, Bala Kawa M.
Mustafa, Andam
Kareem, Dalshad Ahmed
Yuce, Mehmet Ishak
Szydłowski, Micchał
Al-Ansari, Nadhir - Powiązania:
- https://bibliotekanauki.pl/articles/31340451.pdf
- Data publikacji:
- 2023
- Wydawca:
- Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
- Tematy:
-
open channel
backward-facing step
reattachment length
expansion ratio
Kɛ- model
Kω- model - Opis:
- 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.
- Źródło:
-
Archives of Hydro-Engineering and Environmental Mechanics; 2023, 70, 1; 49-69
1231-3726 - Pojawia się w:
- Archives of Hydro-Engineering and Environmental Mechanics
- Dostawca treści:
- Biblioteka Nauki
Artykuł