چکیده مقاله
As a result of topography changes along the open channels, designing the right bend is an essential Channel width limits, such as existence of culverts beneath the roads and sharp changes in topographies, usually impel engineers to design non prismatic or converging bends along the open channels In this research the flow pattern in a 90o curved converging rectangular open channel is numerically investigated A three dimensional simulation was carried out using the commercial CFD package ANSYS FLUENT To obtain the most accurate pattern, five different turbulence models: standard k ε, realizable k ε, RNG k ε, k ω and RSM, along with the VOF free surface model were utilized to solve the 3D Navier Stokes equations The accuracy of the model was analyzed with observed data from experimental study of an ordinary 90o open channel curvature as a qualitative reference and the computed results of the present study were validated The predicted results for the flow characteristics are in reasonable agreement with the experiment data As extent of the work, a converging open channel bend was simulated and the velocity profiles and the flow separation after the bend are evaluated It has been concluded that unlike the ordinary open channel bend, the minimum velocity in a converging channel occurs in different locations along the bend while the separation zone is eliminated Concerning how it can affect the conveyance capacity and channel width, the issue could be attention getting in the study of sedimentary processes of meandering rivers
کلیدواژهها
نویسندگان
Omid Seyedashraf
M Sc Student, Department of Civil Engineering, Razi University of Kermanshah, Iran
علی اکبر اختری
Assistant Professor, Department of Civil Engineering, Razi University of Kermanshah, Iran
Milad Khatib Shahidi
M Sc Student, Civil Engineering Faculty, University of Tabriz, Iran
شیوه ارجاع
Seyedashraf, Omid and Akhtari, Ali Akbar and Khatib Shahidi, Milad,1391,Numerical Study of Channel Convergence Effects on Flow Pattern in 90 Degree Bends,9th International Congress on Civil Engineering,Isfahan
ارائهشده در
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