Assessment of Turbulent Models in Computation of Strongly Curved Open Channel Flows

Journal of Water Sciences Research

مقاله 4، دوره 7، شماره 2 - شماره پیاپی 10، فروردین 2015، صفحه 39-51   

نوع مقاله: Original Article

نویسندگان

Omid Seyedashraf¹؛ Ali Akbar Akhtari^{* 2}

¹M.Sc. Hydraulics Engineering., Faculty Member, Department of Civil Engineering, Kermanshah University of Technology, Kermanshah, Iran

²Assistant Professor, Hydraulics Engineering Faculty Member, Department of Civil Engineering, Razi University, Kermanshah, Iran

چکیده

Several rigorous turbulent models have been developed in the past years and it can be seen that more research is needed to reach a better understanding of their generality and precision by verifying their applications for distinct hydraulic phenomena; under certain assumptions. This survey evaluates the performance of Standard k-ε, Realizable k-ε, RNG k-ε, k-ω and RSM models in predicting flow behavior in a strongly curved open channel bend. Accordingly, three-dimensional numerical simulations were carried out using a state-of-the-art computational fluid dynamics code, ANSYS-Fluent14, which employs finite volume method to solve the respective governing equations. The models’ accuracy were analyzed and compared with observed data from experimental studies on a 90° open channel bend. The results indicate that although the RSM model can precisely capture all the flow characteristics in a strongly curved open channel flow, the Standard k-ε model may be considered as slightly less accurate yet much faster model.

کلیدواژه‌ها

Open Channel Bend؛ Strongly Curved Flow؛ Turbulent Models؛ Two-phase flow؛ Volume Of Fluid